Yamaha F25, T25 user guide

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Page 1

OWNER’S MANUAL

F25 T25

q Read this manual carefully before operating this outboard motor.

U.S.A.Edition

LIT-18626-08-49

6BP-28199-11

Page 2

EMU25062

ZMU01690

Read this manual carefully before operating this outboard motor. Keep this manual onboard in a waterproof bag when boating. This manual should stay with the outboard motor if it is sold.

Page 3

Important manual information

EMU31283

To the owner

Thank you for choosing a Yamaha outboard motor. This Owner’s Manual contains information needed for proper operation, maintenance and care. A thorough understanding of these simple instructions will help you obtain maximum enjoyment from your new Yamaha. If you have any question about the operation or maintenance of your outboard motor, please consult a Yamaha dealer. In this Owner’s Manual particularly important information is distinguished in the following ways.

: This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death.

EWM00781

WARNING

A WARNING indicates a hazardous situation which, if not avoided, could result in death or serious injury.

ECM00701

NOTICE

A NOTICE indicates special precautions that must be taken to avoid damage to the outboard motor or other property.

there is any question concerning this manual, please consult your Yamaha dealer.

IP:

The F25A, F25EA, F25EHA, F25MHA, T25A and the standard accessories are used as a base for the explanations and illustrations in this manual. Therefore some items may not apply to every model.

EMU25111

F25, T25

OWNER’S MANUAL

1st edition, February 2009

Any reprinting or unauthorized use

without the written permission of

Yamaha Motor Corporation, USA

is expressly prohibited.

Printed in Japan

P/N LIT-18626-08-49

IP:

A TIP provides key information to make procedures easier or clearer.

Yamaha continually seeks advancements in product design and quality. Therefore, while this manual contains the most current product information available at the time of printing, there may be minor discrepancies between your machine and this manual. If

Page 4

Table of contents

Safety information............................. 1

Outboard motor safety .................... 1

Propeller............................................ 1

Rotating parts.................................... 1

Hot parts ........................................... 1

Electric shock.................................... 1

Power trim and tilt .............................1

Engine shut-off cord (lanyard)........... 1

Gasoline............................................ 1

Gasoline exposure and spills ............ 2

Carbon monoxide.............................. 2

Modifications ..................................... 2

Boating safety ................................. 2

Alcohol and drugs .............................2

Personal flotation devices ................. 2

People in the water ...........................2

Passengers ....................................... 2

Overloading....................................... 2

Avoid collisions ................................. 3

Weather ............................................ 3

Accident reporting ............................. 3

Boat education and training ..............3

Passenger training ............................ 4

Boating safety publications ...............4

Laws and regulations ........................ 4

Boating organizations...................... 4

Basic boating rules

(Rules of the road) ........................4

Steering and sailing rules and

sound signals.................................. 5

Rules when encountering vessels .... 5

Other special situations..................... 6

General information .......................... 9

Identification numbers record.......... 9

Outboard motor serial number .......... 9

Key number....................................... 9

Read manuals and labels.............. 10

Warning labels ................................10

Specifications and requirements... 14

Specifications ................................ 14

Installation requirements ............... 16

Boat horsepower rating................... 16

Mounting motor ............................... 16

Remote control requirements........ 16

Battery requirements..................... 16

Specifications of Battery.................. 16

Mounting battery .............................17

Multiple batteries ............................. 17

Without a rectifier or Rectifier

Regulator ......................................17

Propeller selection ........................ 17

Start-in-gear protection ................. 18

Engine oil requirements ................ 18

Fuel requirements......................... 18

Gasoline .......................................... 18

Ring Free Fuel Additive................... 19

Muddy or acidic water................... 19

Anti-fouling paint ........................... 19

Motor disposal requirements......... 20

Emergency equipment.................. 20

Emission control information......... 20

North American models................... 20

Star labels .......................................21

Components .................................... 23

Components diagram.................... 23

Fuel tank .........................................24

Fuel joint.......................................... 25

Fuel gauge ......................................25

Fuel tank cap................................... 25

Air vent screw.................................. 25

Remote control box ......................... 25

Remote control lever ....................... 25

Neutral interlock trigger ................... 26

Neutral throttle lever........................ 26

Tiller handle..................................... 26

Gear shift lever................................ 26

Throttle grip ..................................... 27

Throttle indicator .............................27

Throttle friction adjuster................... 28

Engine shut-off cord (lanyard)

and clip.......................................... 28

Engine stop button ..........................29

Manual starter handle .....................29

Starter button ..................................30

Main switch .....................................30

Steering friction adjuster .................30

Power trim and tilt switch on

remote control or tiller handle .......31

Power trim and tilt switch on

bottom engine cowling .................. 31

Page 5

Table of contents

Trim tab with anode ........................ 32

Trim tab........................................... 32

Trim rod (tilt pin).............................. 33

Tilt lock mechanism......................... 33

Tilt support knob ............................. 33

Tilt support bar ................................ 34

Cowling lock lever(s) (turn type)...... 34

Flushing device ............................... 34

Alert indicator .................................. 34

Instruments and indicators ............ 36

Indicators....................................... 36

Low oil pressure-alert indicator ....... 36

Overheat-alert indicator .................. 36

Engine control system.................... 37

Alert system .................................. 37

Overheat alert .................................37

Low oil pressure alert...................... 37

Installation .......................................39

Installation ..................................... 39

Mounting the outboard motor.......... 39

Clamping the outboard motor ......... 40

Operation .........................................42

First-time operation ....................... 42

Fill engine oil ................................... 42

Breaking in engine ..........................42

Getting to know your boat ............... 42

Checks before starting engine ...... 42

Fuel level......................................... 42

Remove cowling.............................. 43

Fuel system..................................... 43

Controls........................................... 43

Engine shut-off cord (lanyard)......... 44

Engine oil ........................................45

Engine............................................. 45

Flushing device ............................... 45

Install cowling.................................. 45

Checking power trim and tilt

system .......................................... 46

Battery............................................. 46

Filling fuel ...................................... 46

Operating engine........................... 47

Sending fuel (portable tank)............ 47

Starting engine................................ 49

Checks after starting engine ......... 55

Cooling water ..................................55

Warming up engine....................... 55

Manual start and electric start

models ..........................................55

Checks after engine warm-up....... 55

Shifting ............................................55

Stop switches .................................. 56

Shifting.......................................... 56

Stopping boat................................ 58

Stopping engine............................ 58

Procedure........................................ 58

Trimming outboard motor.............. 59

Adjusting trim angle for manual tilt

models ..........................................59

Adjusting trim angle

(Power trim and tilt)....................... 60

Adjusting boat trim ..........................61

Tilting up and down....................... 62

Procedure for tilting up

(manual tilt models)....................... 62

Procedure for tilting up

(power trim and tilt models)........... 63

Procedure for tilting down

(manual tilt models)....................... 65

Procedure for tilting down

(power trim and tilt models)........... 65

Shallow water................................ 66

Cruising in shallow water

(manual tilt models)....................... 66

Power trim and tilt models............... 67

Cruising in other conditions........... 68

Maintenance .................................... 69

Transporting and storing outboard

motor ........................................... 69

Clamp screw mounting models ....... 69

Storing outboard motor ...................69

Procedure........................................ 70

Lubrication....................................... 71

Cleaning and anticorrosion

measures ...................................... 71

Flushing power unit ......................... 71

Cleaning the outboard motor........... 72

Checking painted surface of

motor............................................. 72

Periodic maintenance ................... 72

Page 6

Table of contents

Replacement parts.......................... 73

Maintenance interval guidelines...... 73

Maintenance chart 1 ....................... 74

Maintenance chart 2 ....................... 76

Greasing ......................................... 77

Cleaning and adjusting spark

plug ............................................... 78

Checking fuel filter .......................... 79

Inspecting idling speed ................... 79

Changing engine oil ........................80

Checking wiring and connectors ..... 82

Checking propeller .......................... 82

Removing propeller......................... 82

Installing propeller........................... 83

Changing gear oil............................ 84

Cleaning fuel tank ...........................85

Inspecting and replacing

anode(s)........................................ 86

Checking battery

(for electric start models) ..............86

Connecting the battery.................... 87

Disconnecting the battery ............... 87

Trouble Recovery............................ 89

Troubleshooting ............................ 89

Temporary action in emergency.... 92

Impact damage ...............................92

Replacing fuse ................................92

Power trim and tilt will not

operate.......................................... 93

Starter will not operate .................... 93

Emergency starting engine

(manual start model)..................... 94

Emergency starting engine

(electric start model) .....................96

Treatment of submerged motor..... 97

Consumer information.................... 98

YAMAHA MOTOR

CORPORATION, U.S.A. FOUR-STROKE OUTBOARD MOTOR THREE-YEAR LIMITED

WARRANTY ................................ 98

IMPORTANT WARRANTY

INFORMATION IF YOU USE YOUR YAMAHA OUTSIDE

THE USA OR CANADA............ 100

Page 7

Safety information

EMU33622

Outboard motor safety

Observe these precautions at all times.

EMU36501

Propeller

People can be injured or killed if they come in contact with the propeller. The propeller can keep moving even when the motor is in neutral, and sharp edges of the propeller can cut even when stationary.

●

Stop the engine when a person is in the water near you.

●

Keep people out of reach of the propeller, even when the engine is off.

EMU33630

Rotating parts

Hands, feet, hair, jewelry, clothing, PFD straps, etc. can become entangled with internal rotating parts of the engine, resulting in serious injury or death. Keep the top cowling in place whenever possible. Do not remove or replace the cowling with the engine running. Only operate the engine with the cowling removed according to the specific instructions in the manual. Keep hands, feet, hair, jewelry, clothing, PFD straps, etc. away from any exposed moving parts.

EMU33640

Hot parts

During and after operation, engine parts are hot enough to cause burns. Avoid touching any parts under the top cowling until the engine has cooled.

EMU33650

Electric shock

Do not touch any electrical parts while starting or operating the engine. They can cause shock or electrocution.

EMU33660

Power trim and tilt

Body parts can be crushed between the mo-

tor and the clamp bracket when the motor is trimmed or tilted. Keep body parts out of this area at all times. Be sure no one is in this area before operating the power trim and tilt mechanism. The power trim and tilt switches operate even when the main switch is off. Keep people be away from the switches whenever working around the motor. Never get under the lower unit while it is tilted, even when the tilt support lever is locked. Severe injury could occur if the outboard motor accidentally falls.

EMU33671

Engine shut-off cord (lanyard)

Attach the engine shut-off cord so that the engine stops if the operator falls overboard or leaves the helm. This prevents the boat from running away under power and leaving people stranded, or running over people or objects. Always attach the engine shut-off cord to a secure place on your clothing or your arm or leg while operating. Do not remove it to leave the helm while the boat is moving. Do not attach the cord to clothing that could tear loose, or route the cord where it could become entangled, preventing it from functioning. Do not route the cord where it is likely to be accidentally pulled out. If the cord is pulled during operation, the engine will shut off and you will lose most steering control. The boat could slow rapidly, throwing people and objects forward.

EMU33810

Gasoline

Gasoline and its vapors are highly flammable and explosive.

cording to the procedure on page 47 to reduce the risk of fire and explosion.

Always, refuel ac-

Page 8

Safety information

EMU33820

Gasoline exposure and spills

Take care not to spill gasoline. If gasoline spills, wipe it up immediately with dry rags. Dispose of rags properly. If any gasoline spills onto your skin, immediately wash with soap and water. Change clothing if gasoline spills on it. If you swallow gasoline, inhale a lot of gasoline vapor, or get gasoline in your eyes, get immediate medical attention. Never siphon fuel by mouth.

EMU33900

Carbon monoxide

This product emits exhaust gases which contain carbon monoxide, a colorless, odorless gas which may cause brain damage or death when inhaled. Symptoms include nausea, dizziness, and drowsiness. Keep cockpit and cabin areas well ventilated. Avoid blocking exhaust outlets.

EMU33780

Modifications

Do not attempt to modify this outboard motor. Modifications to your outboard motor may reduce safety and reliability, and render the outboard unsafe or illegal to use.

EMU33740

Boating safety

This section includes a few of the many important safety precautions that you should follow when boating.

EMU33710

Alcohol and drugs

Never operate after drinking alcohol or taking drugs. Intoxication is one of the most common factors contributing to boating fatalities.

EMU33720

Personal flotation devices

Have an approved personal flotation device (PFD) on board for every occupant. Yamaha

recommends that you must wear a PFD whenever boating. At a minimum, children and non-swimmers should always wear PFDs, and everyone should wear PFDs when there are potentially hazardous boating conditions.

EMU33731

People in the water

Always watch carefully for people in the water, such as swimmers, skiers, or divers, whenever the engine is running. When someone is in the water near the boat, shift into neutral and stop the engine. Stay away from swimming areas. Swimmers can be hard to see. The propeller can keep moving even when the motor is in neutral. Stop the engine when a person is in the water near you.

EMU33751

Passengers

Consult your boat manufacturer’s instructions for details about appropriate passenger locations in your boat and be sure all passengers are positioned properly before accelerating and when operating above an idle speed. Standing or sitting in non-designated locations may result in being thrown either overboard or within the boat due to waves, wakes, or sudden changes in speed or direction. Even when people are positioned properly, alert your passengers if you must make any unusual maneuver. Always avoid jumping waves or wakes.

EMU33760

Overloading

Do not overload the boat. Consult the boat capacity plate or boat manufacturer for maximum weight and number of passengers. Be sure that weight is properly distributed according to the boat manufacturers instructions. Overloading or incorrect weight distribution can compromise the boats han-

Page 9

Safety information

dling and lead to an accident, capsizing or swamping.

EMU33772

Avoid collisions

Scan constantly for people, objects, and other boats. Be alert for conditions that limit your visibility or block your vision of others.

ZMU06025

Operate defensively at safe speeds and keep a safe distance away from people, objects, and other boats.

Do not follow directly behind other boats or

●

waterskiers.

●

Avoid sharp turns or other maneuvers that make it hard for others to avoid you or understand where you are going.

●

Avoid areas with submerged objects or shallow water.

●

Ride within your limits and avoid aggressive maneuvers to reduce the risk of loss of control, ejection, and collision.

●

Take early action to avoid collisions. Remember, boats do not have brakes, and stopping the engine or reducing throttle can reduce the ability to steer. If you are not sure that you can stop in time before hitting an obstacle, apply throttle and turn in another direction.

EMU33790

Weather

Stay informed about the weather. Check weather forecasts before boating. Avoid

boating in hazardous weather.

EMU33800

Accident reporting

Boat operators are required by law to file a Boating Accident Report with their state boating law enforcement agency if their boat is involved in any of the following accidents:

1. There is loss of life or probable loss of life.

2. There is personal injury that requires medical attention beyond first aid.

3. There is property damage to boats or other property over a certain amount.

4. There is complete loss of a boat.

Contact local law enforcement personnel if a report is necessary.

EMU33870

Boat education and training

Operators should take a boating safety course. This may be required in your state. Many of the organizations listed in the next section can provide information about courses in your area. You may also want to consider an Internetbased program for basic boater education. The Online Boating Safety Course provided by the BoatU.S. Foundation, is approved by the National Association of State Boating Law Administrators (NASBLA) and recognized by the United States Coast Guard. Most, but not all, states accept this course to meet their minimum requirements. While it cannot replace an in-depth course such as one offered by the U.S. Coast Guard, U.S. Power Squadron, or other organization, this online course does provide a general overview of the basics in boating safety, requirements, navigation, and operation. Upon successful completion of the course, the user can download a certificate of completion immediately or, for a small charge, request one by mail. To take this free course,

Page 10

Safety information

go to boatus.org.

EMU33880

Passenger training

Make sure at least one other passenger is trained to operate the boat in the event of an emergency.

EMU33890

Boating safety publications

Be informed about boating safety. Additional publications and information can be obtained from many boating organizations.

EMU33590

Laws and regulations

Know the marine laws and regulations where you will be boating- and obey them. Several sets of rules prevail according to geographic location, but all are basically the same as the International Rules of the Road. The rules presented in the following section are condensed- and have been provided for your convenience only. Contact the U.S. Coast Guard, the National Association of State Boating Law Administrators, or your local Power Squadron for a complete set of rules governing the waters in which you will be using your boat.

EMU33681

Boating organizations

The following organizations provide boating safety training and information about boating safety and laws.

United States Coast Guard

Consumer Affairs Staff (G-BC) Office of Boating, Public, and Consumer Affairs U.S. Coast Guard Headquarters Washington, D.C. 20593-0001 Boating Safety Hotline: 1-800-368-5647 www.uscgboating.org

United States Power Squadrons

1-888-FOR-USPS (1-888-367-8777) www.usps.org

Boat Owners Association of The United States

1-800-336-BOAT (1-800-336-2628) www.boatus.com

National Association of State Boating Law Administrators (NASBLA)

1500 Leestown Road, Suite 330 Lexington, KY 40511 859-225-9497 www.nasbla.org

National Marine Manufacturers Association (NMMA)

200 East Randolph Drive Suite 5100 Chicago, IL 60601 www.nmma.org

Marine Retailers Association of America

155 N. Michigan Ave. Chicago, IL 60304 www.mraa.com

EMU33690

Basic boating rules (Rules of

the road)

Just as there are rules that apply when you are driving on streets and highways, there are waterway rules that apply when you are driving your boat. These rules are used internationally. (For USA: and are also enforced by the United States Coast Guard and local agencies.) You should be aware of these rules, and follow them whenever you encounter another vessel on the water.

Page 11

Safety information

EMU33700

Steering and sailing rules and sound signals

Whenever two vessels on the water meet one another, one vessel has the right-ofway; it is called the “stand-on” vessel. The vessel that does not have the right-of-way is called the “give-way” or “burdened”vessel. These rules determine which vessel has the right-of-way, and what each vessel should do.

Stand-on vessel

The vessel with the right-of-way has the duty to continue its course and speed, except to avoid an immediate collision. When you maintain your direction and speed, the other vessel will be able to determine how best to avoid you.

Give-way vessel

The vessel that does not have the right-ofway has the duty to take positive and timely action to stay out of the way of the Stand-On vessel. Normally, you should not cross in front of the vessel with the right-of-way. You should slow down or change directions briefly and pass behind the other vessel. You should always move in such a way that the operator of the other vessel can see what you are doing.

“ The general prudential rule ”

This rule is called Rule 2 in the International Rules and says, “ In obeying and construing these rules due regard shall be had to all dangers of navigation and collision, and to any special circumstances, which may render a departure from the above rules necessary in order to avoid immediate danger.” In other words, follow the standard rules except when a collision will occur unless both

vessels try to avoid each other. If that is the case, both vessels become “ Give-Way ” vessels.

EMU25521

Rules when encountering vessels

There are three main situations that you may encounter with other vessels which could lead to a collision unless the Steering Rules are followed:

Meeting:

sel head-on)

Crossing:

er vessel’s path)

Overtaking:

passed by another vessel) In the following illustration, your boat is in the center. You should give the right-of-way to any vessels shown in white area (you are the Give-Way vessel). Any vessels in the shaded area must yield to you (they are the GiveWay vessels). Both you and the meeting vessel must alter course to avoid each other.

Meeting

If you are meeting another power vessel head on, and are close enough to run the risk of collision, neither of you has the right-ofway Both of you should alter course to avoid an accident. You should keep the other vessel on your port (left) side. This rule doesn’t apply if both of you will clear one another if you continue on your set course and speed.

(you are approaching another ves-

(you are traveling across the oth-

(you are passing or being

Page 12

Safety information

Crossing

When two power driven vessels are crossing each other’s path close enough to run the risk of collision, the vessel which has the other on the starboard (right) side must keep out of the way of the other. If the other vessel is on your right, you must keep out of its way; you are the Give-Way vessel. If the other vessel is on your port (left) side, remember that you should maintain course and direction, provided the other vessel gives you the right-of-way as it should.

Overtaking

If you are passing another vessel, you are the “Give-Way” vessel. This means that the other vessel is expected to maintain its course and speed. You must stay out of its way until you are clear of it. Likewise, if another vessel is passing you, you should maintain your speed and direction so that the other vessel can steer itself around you.

EMU25531

Other special situations

There are three other rules you should be aware of when driving your boat around other vessels.

Narrow channels and bends

When navigating in narrow channels, you should keep to the right when it is safe and practical to do so. If the operator of a powerdriven vessel is preparing to go around a bend that may obstruct the view of other water vessels, the operator should sound a prolonged blast on the whistle (4 to 6 seconds). If another vessel is around the bend, it too should sound the whistle. Even if no reply is heard, however, the vessel should still proceed around the bend with caution. If you navigate such waters with your boat, you will need to carry a portable air horn, available from local marine supply stores.

Fishing vessel right-of-way

All vessels that are fishing with nets, lines or trawls are considered to be “fishing vessels” under the International Rules. Vessels with trolling lines are not considered fishing vessels. Fishing vessels have the right-of-way regardless of position. Fishing vessels cannot, however, impede the passage of other vessels in narrow channels.

Sailing vessel right-of-way

Sailing vessels should normally be given the right-of-way. The exceptions to this are:

1. When the sailing vessel is overtaking the power-driven vessel, the power-driven vessel has the right-of-way.

2. Sailing vessels should keep clear of any fishing vessel.

3. In a narrow channel, a sailing vessel should not hamper the safe passage of a power-driven vessel that can navigate only in such a channel.

Page 13

Reading buoys and other markers

The waters of the United States are marked for safe navigation by the lateral system of buoyage. Simply put, buoys and markers have an arrangement of shapes, colors, numbers and lights to show which side of the buoy a boater should pass on when navigating in a particular direction. The markings on these buoys are oriented from the perspective of being entered from seaward (the boater is going towards the port). This means that red buoys are passed on the starboard (right) side when proceeding from open water into port, and black buoys are to port (left) side. When navigating out of port, your position with respect to the buoys should be reversed; red buoys should be to port and black buoys to starboard. Many bodies of water used by boaters are entirely within the boundaries of a particular state. The Uniform State Waterway Marking System has been devised for these waters. This system uses buoys and signs with distinctive shapes and colors to show regulatory or advisory information. These markers are white with black letters and orange boarders. They signify speed zones, restricted areas, danger areas, and general information. Remember, markings may vary by geographic location. Always consult local boating authorities before driving your boat in unfamiliar waters.

Safety information

Page 14

Safety information

ZMU01708

Page 15

EMU25171

Identification numbers record

EMU25183

Outboard motor serial number

The outboard motor serial number is stamped on the label attached to the port side of the clamp bracket. Record your outboard motor serial number in the spaces provided to assist you in ordering spare parts from your Yamaha dealer or for reference in case your outboard motor is stolen.

ZMU06472

1. Outboard motor serial number location

General information

1. Key number

EMU25190

Key number

If a main key switch is equipped with the motor, the key identification number is stamped on your key as shown in the illustration. Record this number in the space provided for reference in case you need a new key.

Page 16

General information

EMU33520

Read manuals and labels

Before operating or working on this motor:

●

Read this manual.

●

Read any manuals supplied with the boat.

●

Read all labels on the outboard motor and the boat.

If you need any additional information, contact your Yamaha dealer.

EMU33831

Warning labels

If these labels are damaged or missing, contact your Yamaha dealer for replacements.

F25A, F25EA, T25A

ZMU06477

Page 17

F25EHA, F25MHA

General information

ZMU06475

Page 18

General information

ZMU05670

Page 19

General information

EMU33843

Symbols

The following symbols mean as follows.

Notice/Warning

ZMU05696

Read Owner’s Manual

ZMU05664

Electrical hazard

ZMU05666

Remote control lever/gear shift lever operating direction, dual direction

ZMU05667

Engine start/ Engine cranking

Hazard caused by continuous rotation

ZMU05665

ZMU05668

Page 20

Specifications and requirements

EMU34520

Specifications

IP:

“(AL)” stated in the specification data below represents the numerical value for the aluminum propeller installed. Likewise, “(SUS)” represents the value for stainless steel propeller installed and “(PL)” for plastic propeller installed.

IP:

“*” means, select the engine oil referring to the chart of engine oil paragraph. For further information, see page 18.

EMU2821D

Dimension:

Overall length:

F25A 724 mm (28.5 in) F25EA 724 mm (28.5 in) F25EHA 1181 mm (46.5 in) F25MHA 1181 mm (46.5 in) T25A 735 mm (28.9 in)

Overall width:

398 mm (15.7 in)

Overall height S:

F25EA 1156 mm (45.5 in) F25EHA 1156 mm (45.5 in) F25MHA 1157 mm (45.6 in)

Overall height L:

F25A 1283 mm (50.5 in) F25EA 1284 mm (50.6 in) F25EHA 1284 mm (50.6 in) F25MHA 1284 mm (50.6 in) T25A 1312 mm (51.7 in)

Transom height S:

423 mm (16.7 in)

Transom height L:

F25A 550 mm (21.7 in) F25EA 550 mm (21.7 in) F25EHA 550 mm (21.7 in) F25MHA 550 mm (21.7 in)

T25A 536 mm (21.1 in)

Weight (AL) S:

F25EA 78.0 kg (172 lb) F25EHA 80.0 kg (176 lb) F25MHA 77.0 kg (170 lb)

Weight (AL) L:

F25A 82.0 kg (181 lb) F25EA 79.0 kg (174 lb) F25EHA 81.0 kg (179 lb) F25MHA 78.0 kg (172 lb) T25A 92.0 kg (203 lb)

Performance:

Full throttle operating range:

5000–6000 r/min

Maximum output:

18.4 kW@5500 r/min (25 HP@5500 r/min)

Idling speed (in neutral):

975 ±50 r/min

Engine:

Type:

4-stroke L

Displacement:

498.0 cm

Bore × stroke:

65.0 × 75.0 mm (2.56 × 2.95 in)

Ignition system:

CDI

Spark plug with resistor (NGK):

DPR6EB-9

Spark plug gap:

0.8–0.9 mm (0.031–0.035 in)

Control system:

F25A Remote control F25EA Remote control F25EHA Tiller F25MHA Tiller T25A Remote control

Starting system:

F25A Electric F25EA Electric

Page 21

Specifications and requirements

F25EHA Electric F25MHA Manual T25A Electric

Starting carburetion system:

Prime start

Valve clearance (cold engine) IN:

0.15–0.25 mm (0.0059–0.0098 in)

Valve clearance (cold engine) EX:

0.25–0.35 mm (0.0098–0.0138 in)

Min. cold cranking amps (CCA/SAE):

F25A 245.0 A F25EA 245.0 A F25EHA 245.0 A T25A 245.0 A

Min. marine cranking amps (MCA/ABYC):

F25A 323.0 A F25EA 323.0 A F25EHA 323.0 A T25A 323.0 A

Min. reserve capacity (RC/SAE):

F25A 52 minutes F25EA 52 minutes F25EHA 52 minutes T25A 52 minutes

Maximum generator output:

14 A

Drive unit:

Gear positions:

Forward-neutral-reverse

Gear ratio:

F25A 2.08(27/13) F25EA 2.08(27/13) F25EHA 2.08(27/13) F25MHA 2.08(27/13) T25A 2.42(29/12)

Trim and tilt system:

F25A Power trim and tilt F25EA Manual tilt F25EHA Manual tilt F25MHA Manual tilt T25A Power trim and tilt

Fuel and oil:

Recommended fuel:

Regular unleaded gasoline

Min. pump octane:

Fuel tank capacity:

24 L (6.34 US gal, 5.28 Imp.gal)

Recommended engine oil:

4-stroke outboard motor oil

Recommended engine oil group 1*:

SAE 10W-30/10W-40/5W-30 API SE/SF/SG/SH/SJ/SL

Recommended engine oil group 2*:

SAE 15W-40/20W-40/20W-50 API SH/SJ/SL

Lubrication:

Wet sump Total engine oil quantity (oil pan capacity): Without oil filter replacement:

1.4 L (1.48 US qt, 1.23 Imp.qt)

With oil filter replacement:

1.6 L (1.69 US qt, 1.41 Imp.qt)

Recommended gear oil:

Hypoid gear oil SAE#90 Gear oil quantity:

F25A 0.320 L

(0.338 US qt, 0.282 Imp.qt)

F25EA 0.320 L

(0.338 US qt, 0.282 Imp.qt)

F25EHA 0.320 L

(0.338 US qt, 0.282 Imp.qt)

F25MHA 0.320 L

(0.338 US qt, 0.282 Imp.qt)

T25A 0.430 L

(0.455 US qt, 0.378 Imp.qt)

Tightening torque for engine:

Spark plug:

17.0 Nm (1.73 kgf-m, 12.5 ft-lb)

Propeller nut:

35.0 Nm (3.57 kgf-m, 25.8 ft-lb)

Engine oil drain bolt:

Page 22

Specifications and requirements

27.0 Nm (2.75 kgf-m, 19.9 ft-lb)

Engine oil filter:

18.0 Nm (1.84 kgf-m, 13.3 ft-lb)

EMU33554

Installation requirements

EMU33563

Boat horsepower rating

EWM01560

WARNING

Overpowering a boat can cause severe instability.

Before installing the outboard motor(s), confirm that the total horsepower of your motor(s) does not exceed the boats maximum horsepower rating. See the boat’s capacity plate or contact the manufacturer.

EMU33571

Mounting motor

EWM01570

WARNING

Improper mounting of the outboard mo-

●

tor could result in hazardous conditions such as poor handling, loss of control, or fire hazards. Because the motor is very heavy, spe-

●

cial equipment and training is required to mount it safely.

Your dealer or other person experienced in proper rigging should mount the motor using correct equipment and complete rigging instructions. For further information, see page

39.

EMU33581

Remote control requirements

EWM01580

WARNING

If the engine starts in gear, the boat can

●

move suddenly and unexpectedly, possibly causing a collision or throwing passengers overboard.

●

If the engine ever starts in gear, the

start-in-gear protection device is not working correctly and you should discontinue using the outboard. Contact your Yamaha dealer.

The remote control unit must be equipped with a start-in-gear protection device(s). This device prevents the engine from starting unless it is in neutral.

EMU25694

Battery requirements

EMU25713

Specifications of Battery

Use a fully charged battery that meets the following specifications. The engine cannot be started if battery voltage is too low.

Minimum cold cranking amps (CCA/ SAE):

F25A 245.0 A F25EA 245.0 A F25EHA 245.0 A

T25A 245.0 A Minimum marine cranking amps (MCA/ ABYC):

F25A 323.0 A

F25EA 323.0 A

F25EHA 323.0 A

T25A 323.0 A Minimum reserve capacity (RC/SAE):

F25A 52 minutes

F25EA 52 minutes

F25EHA 52 minutes

T25A 52 minutes

ECM01061

NOTICE

Do not use a battery that does not meet the specified capacity. If a battery that does not meet specifications is used, the electric system could perform poorly or be overloaded, causing electric system

Page 23

Specifications and requirements

damage.

EMU36290

Mounting battery

Mount the battery holder securely in a dry, well-ventilated, vibration-free location in the boat.

WARNING! Do not put flammable items, or loose heavy or metal objects in the same compartment as the battery. Fire, explosion or sparks could result.

[EWM01820]

EMU36300

Multiple batteries

To connect multiple batteries, such as for multiple engine configurations or for an accessory battery, consult your Yamaha dealer about battery selection and correct wiring.

EMU25730

Without a rectifier or Rectifier Regulator

ECM01090

NOTICE

A battery cannot be connected to models that do not have a rectifier or Rectifier Regulator.

If you wish to use a battery with the models without a rectifier or Rectifier Regulator, install an optional Rectifier Regulator. Using a maintenance-free battery with the above models can shorten the life of the battery significantly. Install an optional Rectifier Regulator or use accessories rated to withstand 18 volts or higher with the above models. Consult your Yamaha dealer for details on installing an optional Rectifier Regulator.

EMU34192

Propeller selection

Next to selecting an outboard, choosing the right propeller is one of the most important purchasing decisions a boater can make. The type, size, and design of your propeller

have a direct impact on acceleration, top speed, fuel economy, and even engine life. Yamaha designs and manufactures propellers for every Yamaha outboard motor and every application. Your outboard motor came with a Yamaha propeller chosen to perform well over a range of applications, but there may be uses where a different propeller would be more appropriate. Your Yamaha dealer can help you select the right propeller for your boating needs. Select a propeller that will allow the engine to reach the middle or upper half of the operating range at full throttle with the maximum boatload. Generally, chose a larger pitch propeller for a smaller operating load and a smaller pitch propeller for a heavier load. If you carry loads that vary widely, chose the propeller that lets the engine run in the proper range for your maximum load but remember that you may need to reduce your throttle setting to stay within the recommended engine speed range when carrying lighter loads. For instructions on propeller removal and installation, see page 82.

123

ZMU04604

1. Propeller diameter in inches

2. Propeller pitch in inches

3. Type of propeller (propeller mark)

Page 24

Specifications and requirements

following chart according to the average temperatures in your area.

123

ZMU04606

1. Propeller diameter in inches

2. Propeller pitch in inches

3. Type of propeller (propeller mark)

EMU25770

Start-in-gear protection

Yamaha outboard motors or Yamaha-approved remote control units are equipped with start-in-gear protection device(s). This feature permits the engine to be started only when it is in neutral. Always select neutral before starting the engine.

EMU31444

Engine oil requirements

Recommended engine oil:

YAMALUBE 4-M FC-W oil or 4-stroke motor oil with a combination of the following SAE and API oil classifications

Engine oil type SAE:

10W-30 or 10W-40

Engine oil grade API:

SE, SF, SG, SH, SJ, SL Total engine oil quantity (oil pan capacity):

Without oil filter replacement:

1.4 L (1.48 US qt, 1.23 Imp.qt)

With oil filter replacement:

1.6 L (1.69 US qt, 1.41 Imp.qt)

If the recommended engine oil grades are not available, select an alternative from the

EMU36360

Fuel requirements

EMU36781

Gasoline

Use a good quality gasoline that meets the minimum octane rating. If knocking or pinging occurs, use a different brand of gasoline or premium unleaded fuel. Yamaha recomends that you use alcohol-free (see Gasohol) gasoline whenever possible.

Recommended gasoline:

Regular unleaded gasoline with a minimum Octane rating of 86 (Pump Octane Number) = (R+M)/2

ECM01981

NOTICE

●

Do not use leaded gasoline. Leaded gasoline can seriously damage the engine.

●

Avoid getting water and contaminants in the fuel tank. Contaminated fuel can cause poor performance or engine damage. Use only fresh gasoline that

Page 25

Specifications and requirements

has been stored in clean containers.

Gasohol

There are two types of gasohol: gasohol containing ethanol (E10) and that containing methanol. Ethanol can be used if the ethanol content does not exceed 10% and the fuel meets the minimum octane ratings. E85 is a fuel containing 85% ethanol and must not be used in your outboard motor. All ethanol blends containing more than 10% ethanol can cause fuel system damage or cause engine starting and running problems. Yamaha does not recommend gasohol containing methanol because it can cause fuel system damage or engine performance problems. It is recommended that you install a waterseparating marine fuel filter assembly (10 micron minimum) between your boat’s fuel tank and outboard motor when using ethanol. Ethanol is known to allow moisture to be absorbed into boat fuel tanks and systems. Moisture in the fuel can cause corrosion of metallic fuel system components, starting and running complaints and require additional fuel system maintenance.

EMU27270

Ring Free Fuel Additive

Gasoline is a precise blend of many different substances, each chosen to give certain characteristics. Gasoline blends have been changing in recent years in response to concerns about pollution and resulting emissions regulations. One of the most obvious changes has been the elimination of lead from most fuels. As gasoline has changed, the amount of additives such as aromatics and oxygenates has increased. These additives are important for the engines in passenger cars, but they can have detrimental effects in marine engines, because of increased deposits in

the combustion chamber. When enough deposits collect, piston rings begin sticking. Performance drops and engine wear increases dramatically. While many additives available may reduce deposits, Yamaha recommends the use of

Ring Free Fuel Additive

your Yamaha dealer.

tive

has repeatedly proven its ability to clean combustion deposits from inside the engine, notably the critical piston-ring-land area, and fuel system components. Follow product labeling for use instructions.

EMU36880

, available from

Ring Free Fuel Addi-

Muddy or acidic water

Yamaha strongly recommends that you have your dealer install the optional chromiumplated water pump kit if you use the outboard motor in muddy or acidic water conditions. However, depending on the model it might not be required.

EMU36330

Anti-fouling paint

A clean hull improves boat performance. The boat bottom should be kept as clean of marine growth as possible. If necessary, the boat bottom can be coated with an anti-fouling paint approved for your area to inhibit marine growth. Do not use anti-fouling paint which includes copper or graphite. These paints can cause more rapid engine corrosion.

Page 26

Specifications and requirements

EMU36341

Motor disposal requirements

Never illegally discard (dump) the motor. Yamaha recommends consulting the dealer about discarding the motor.

EMU36351

Emergency equipment

Keep the following items onboard in case there is trouble with the motor.

●

A tool kit with assorted screwdrivers, pliers, wrenches (including metric sizes), and electrical tape.

●

Waterproof flashlight with extra batteries.

●

An extra engine shut-off cord (lanyard) with clip.

●

Spare parts, such as an extra set of spark plugs.

Consult your Yamaha dealer for details.

EMU25221

Emission control information

EMU25230

North American models

This engine conforms to U.S. Environmental Protection Agency (EPA) regulations for marine SI engines. See the label affixed to your engine for details.

EMU25242

Approval label of emission control certificate

This label is attached to the bottom cowling. New Technology; (4-stroke/HPDI) EM

1. Approval label location

EMU25262

Manufactured date label

This label is attached to the clamp bracket or the swivel bracket.

1. Manufactured date label location

ZMU06478

ZMU05159

ZMU06480

Page 27

Specifications and requirements

ZMU06391

1. Manufactured date label location

Manufactured:

ZMU04346

EMU25273

Star labels

Your outboard motor is labeled with a California Air Resources Board (CARB) star label. See below for a description of your particular label.

EMU25280

One Star—Low Emission

The one-star label identifies engines that meet the Air Resources Board’s 2001 exhaust emission standards. Engines meeting these standards have 75% lower emissions than conventional carbureted two-stroke engines. These engines are equivalent to the U.S. EPA’s 2006 standards for marine engines.

ZMU01702

EMU25290

Two Stars—Very Low Emission

The two-star label identifies engines that meet the Air Resources Board’s 2004 exhaust emission standards. Engines meeting these standards have 20% lower emissions than One Star-Low-Emission engines.

1. Star labels location

ZMU06481

ZMU01703

EMU25300

Three Stars—Ultra Low Emission

The three-star label identifies engines that meet the Air Resources Board’s 2008 exhaust emission standards. Engines meeting

Page 28

Specifications and requirements

these standards have 65% lower emissions than One Star-Low-Emission engines.

ZMU01704

EMU33861

Four Stars—Super Ultra Low Emission

The four-star label identifies engines that meet the Air Resources Board’s Sterndrive and Inboard marine engine 2009 exhaust emission standards. Personal Watercraft and Outboard marine engines may also comply with these standards. Engines meeting these standards have 90% lower emissions than One Star-Low-Emission engines.

ZMU05663

Page 29

Components

EMU2579M

Components diagram

IP:

* May not be exactly as shown; also may not be included as standard equipment on all models.

F25A, F25EA, T25A

1. Top cowling

2. Cowling lock lever

3. Idle hole

4. Drain screw

5. Anti-cavitation plate

6. Trim tab

7. Propeller

8. Cooling water inlet

9. Clamp bracket

10. Power trim and tilt switch*

11. Alert indicator(s)

12. Tilt support knob*

13. Flushing device

14. Clamp screw*

15. Tilt lock lever*

16. Remote control box (side mount type)*

17. Fuel tank*

ZMU06605

Page 30

Components

F25EHA, F25MHA

1. Top cowling

2. Cowling lock lever

3. Idle hole

4. Drain screw

5. Anti-cavitation plate

6. Trim tab

7. Propeller

8. Cooling water inlet

9. Trim rod

10. Clamp bracket

11. Restraint cable attachment

12. Manual starter handle*

13. Gear shift lever

14. Throttle grip

15. Throttle friction adjuster

16. Engine stop button/Engine shut-off switch

17. Clip

18. Alert indicator(s)

19. Clamp screw

20. Steering friction lever

21. Tilt lock lever

22. Flushing device

23. Starter button*

24. Fuel tank*

EMU25802

Fuel tank

If your model was equipped with a portable fuel tank, its function is as follows.

EWM00020

WARNING

The fuel tank supplied with this engine is its dedicated fuel reservoir and must not be used as a fuel storage container. Commercial users should conform to relevant licensing or approval authority regulations.

ZMU06606

Page 31

ZMU02284

Components

1. Fuel joint

2. Fuel gauge

3. Fuel tank cap

4. Air vent screw

EMU25830

Fuel joint

This joint is used to connect the fuel line.

EMU25841

Fuel gauge

This gauge is located on either the fuel tank cap or on the fuel joint base. It shows the approximate amount of fuel remaining in the tank.

EMU25850

Fuel tank cap

This cap seals the fuel tank. When removed, the tank can be filled with fuel. To remove the cap, turn it counterclockwise.

EMU25860

Air vent screw

This screw is on the fuel tank cap. To loosen the screw, turn it counterclockwise.

EMU26181

Remote control box

The remote control lever actuates both the shifter and the throttle. The electrical switches are mounted on the remote control box.

1. Power trim and tilt switch

2. Remote control lever

3. Neutral interlock trigger

4. Neutral throttle lever

5. Main switch

6. Engine shut-off switch

7. Throttle friction adjuster

EMU26190

Remote control lever

Moving the lever forward from the neutral position engages forward gear. Pulling the lever back from neutral engages reverse. The engine will continue to run at idle until the lever is moved about 35° (a detent can be felt). Moving the lever farther opens the throttle, and the engine will begin to accelerate.

1. Neutral “”

2. Forward “”

3. Reverse “”

4. Shift

5. Fully closed

Page 32

Components

6. Throttle

7. Fully open

EMU26201

Neutral interlock trigger

To shift out of neutral, first pull the neutral interlock trigger up.

1. Neutral interlock trigger

EMU26211

Neutral throttle lever

To open the throttle without shifting into either forward or reverse, put the remote control lever in the neutral position and lift the neutral throttle lever.

IP:

The neutral throttle lever will operate only when the remote control lever is in neutral. The remote control lever will operate only when the neutral throttle lever is in the closed position.

1. Fully open

2. Fully closed

EMU25911

Tiller handle

To change direction, move the tiller handle to the left or right as necessary.

ZMU03032

EMU25922

Gear shift lever

Pulling the gear shift lever towards you puts the engine in forward gear so that the boat

Page 33

moves ahead. Pushing the lever away from you puts the engine in reverse gear so that the boat moves astern.

Components

1. Forward “”

2. Neutral “”

3. Reverse “”

ZMU06486

EMU25961

ZMU03034

Throttle indicator

The fuel consumption curve on the throttle indicator shows the relative amount of fuel consumed for each throttle position. Choose the setting that offers the best performance and fuel economy for the desired operation.

1. Forward “”

2. Neutral “”

3. Reverse “”

EMU25941

Throttle grip

The throttle grip is on the tiller handle. Turn the grip counterclockwise to increase speed and clockwise to decrease speed.

ZMU06488

1. Throttle indicator

Page 34

Components

1. Throttle indicator

EMU25975

Throttle friction adjuster

A friction device provides adjustable resistance to movement of the throttle grip or the remote control lever, and can be set according to operator preference. To increase resistance, turn the adjuster clockwise. To decrease resistance, turn the adjuster counterclockwise.

not overtighten the friction adjuster. If there is too much resistance, it could be difficult to move the remote control lever or throttle grip, which could result in an accident.

[EWM00032]

WARNING! Do

ZMU03169

ZMU02001

When constant speed is desired, tighten the adjuster to maintain the desired throttle setting.

EMU25993

Engine shut-off cord (lanyard) and clip

The clip must be attached to the engine shutoff switch for the engine to run. The cord should be attached to a secure place on the operator’s clothing, or arm or leg. Should the operator fall overboard or leave the helm, the cord will pull out the clip, stopping ignition to the engine. This will prevent the boat from running away under power.

tach the engine shut-off cord to a secure place on your clothing, or your arm or leg while operating. Do not attach the cord to clothing that could tear loose. Do not route the cord where it could become entangled, preventing it from functioning. Avoid accidentally pulling the cord dur-

WARNING! At-

Page 35

ing normal operation. Loss of engine power means the loss of most steering control. Also, without engine power, the boat could slow rapidly. This could cause people and objects in the boat to be thrown forward.

1. Cord

2. Clip

3. Engine shut-off switch

[EWM00122]

Components

1. Cord

2. Clip

3. Engine shut-off switch

EMU26001

Engine stop button

To open the ignition circuit and stop the engine, push this button.

1. Cord

2. Clip

3. Engine shut-off switch

ZMU02003

EMU26070

ZMU02083

Manual starter handle

To start the engine, first gently pull the han-

Page 36

Components

dle out until resistance is felt. From that position, then pull the handle straight out quickly to crank the engine.

ZMU06523

EMU26080

Starter button

To start the engine with the electric starter, push the starter button.

ZMU06526

EMU26090

Main switch

The main switch controls the ignition system; its operation is described below.

●

“”

(off)

With the main switch in the “” (off) posi- tion, the electrical circuits are off, and the key can be removed.

●

“”

(on)

With the main switch in the “” (on) posi- tion, the electrical circuits are on, and the key cannot be removed.

●

“”

With the main switch in the “” (start) po-

(start)

sition, the starter motor turns to start the engine. When the key is released, it returns automatically to the “” (on) position.

EMU31432

Steering friction adjuster

A friction device provides adjustable resistance to the steering mechanism, and can be set according to operator preference. An adjuster lever is located on the bottom of the tiller handle bracket. To increase resistance, turn the lever to the port side “A”. To decrease resistance, turn the lever to the starboard side “B”.

EWM00040

WARNING

Do not overtighten the friction adjuster. If there is too much resistance, it could be difficult to steer, which could result in an accident.

Page 37

ZMU06496

If the resistance does not increase even when the lever is turned to the port side “A”, make sure that the nut is tightened to the specified torque.

Components

EMU26143

Power trim and tilt switch on remote control or tiller handle

The power trim and tilt system adjusts the outboard motor angle in relation to the transom. Pressing the switch “” (up) trims the outboard motor up, and then tilts it up. Pressing the switch “” (down) tilts the outboard motor down and trims it down. When the switch is released, the outboard motor will stop in its current position. For instructions on using the power trim and tilt switch, see pages 59 and 62.

ZMU06497

1. Nut

Nut tightening torque:

4.0 Nm (0.4 kgf-m, 3.0 ft-lb)

IP:

Steering movement is blocked when the

●

adjuster lever is set to the “A” position.

●

Check the tiller handle for smooth movement when the lever is turned to the starboard side “B”.

●

Do not apply lubricants such as grease to the friction areas of the steering friction adjuster.

EMU26153

Power trim and tilt switch on bottom engine cowling

The power trim and tilt switch is located on the side of the bottom engine cowling. Pressing the switch “” (up) trims the outboard motor up, and then tilts it up. Pressing the switch “” (down) tilts the outboard motor

Page 38

Components

down and trims it down. When the switch is released, the outboard motor will stop in its current position. For instructions on using the power trim and tilt switch, see page 62.

EWM01030

WARNING

Use the power trim and tilt switch located on the bottom engine cowling only when the boat is at a complete stop with the engine off. Attempting to use this switch while the boat is moving could increase the risk of falling overboard and could distract the operator, increasing the risk of collision with another boat or an obstacle.

ZMU06495

right or left by applying the same amount of force. If the boat tends to veer to the left (port side), turn the trim tab rear end to the port side “A” in the figure. If the boat tends to veer to the right (starboard side), turn the trim tab end to the starboard side “B” in the figure.

ECM00840

NOTICE

The trim tab also serves as an anode to protect the engine from electrochemical corrosion. Never paint the trim tab as it will become ineffective as an anode.

ZMU02822

1. Trim tab

2. Bolt

1. Power trim and tilt switch

EMU26244

Trim tab with anode

EWM00840

WARNING

An improperly adjusted trim tab could cause difficult steering. Always test run after the trim tab has been installed or replaced to be sure steering is correct. Be sure you have tightened the bolt after adjusting the trim tab.

The trim tab should be adjusted so that the steering control can be turned to either the

Bolt tightening torque:

18.0 Nm (1.8 kgf-m, 13 ft-lb)

EMU26253

Trim tab

EWM00840

WARNING

The trim tab should be adjusted so that the

Page 39

Components

steering control can be turned to either the right or left by applying the same amount of force. If the boat tends to veer to the left (port side), turn the trim tab rear end to the port side “A” in the figure. If the boat tends to veer to the right (starboard side), turn the trim tab end to the starboard side “B” in the figure.

ZMU06498

1. Trim tab

2. Bolt

Bolt tightening torque:

8.0 Nm (0.8 kgf-m, 5.8 ft-lb)

EMU26261

Trim rod (tilt pin)

The position of the trim rod determines the minimum trim angle of the outboard motor in relation to the transom.

EMU30440

Tilt lock mechanism

The tilt lock mechanism is used to prevent the outboard motor from lifting out of the water when in reverse gear.

ZMU06500

1. Tilt lock lever

To tilt the outboard motor up, set the tilt lock lever to the “” (up) position. To tilt the out- board motor down, set the tilt lock lever to the “” (down) position.

EMU26321

Tilt support knob

To keep the outboard motor in the tilted up position, push the tilt support knob under the swivel bracket.

ZMU06536

ZMU06543

ECM00660

NOTICE

Do not use the tilt support lever or knob when trailering the boat. The outboard motor could shake loose from the tilt sup-

Page 40

Components

port and fall. If the motor cannot be trailered in the normal running position, use an additional support device to secure it in the tilt position.

EMU26332

Tilt support bar

The tilt support bar keeps the outboard motor in the tilted up position.

ZMU06503

ECM01660

NOTICE

Do not use the tilt support bar when trailering the boat. The outboard motor could shake loose from the tilt support and fall. If the motor cannot be trailered in the normal running position, use an additional support device to secure it in the tilt position.

EMU26373

Cowling lock lever(s) (turn type)

To remove the engine top cowling, turn the cowling lock lever(s) and lift off the cowling. When installing the cowling, check to be sure it fits properly in the rubber seal. Then lock the cowling again by returning the cowling lock lever(s) to the lock position.

ZMU04041

1. Cowling lock lever(s)

EMU26460

Flushing device

This device is used to clean the cooling water passages of the motor using a garden hose and tap water.

IP:

For details on usage, see page 71.

ZMU06505

1. Flushing device

EMU26303

Alert indicator

If the engine develops a condition which is cause for alert, the indicator lights up. For details on how to read the alert indicator, see page 37.

Page 41

1. Alert indicator

Components

ZMU06506

Page 42

Instruments and indicators

EMU36014

Indicators

EMU36024

Low oil pressure-alert indicator

If oil pressure drops too low, this indicator will light up. For further information, see page 37.

ECM00022

NOTICE

Do not continue to run the engine if the

●

low oil pressure-alert indicator is on and the engine oil level is lower. Serious engine damage will occur.

●

The low oil pressure-alert indicator does not indicate the engine oil level. Use the oil dipstick to check the remaining oil quantity. For further information, see page 45.

1. Overheat-alert indicator

ZMU06508

ZMU06507

1. Low oil pressure-alert indicator

EMU36033

Overheat-alert indicator

If the engine temperature rises too high, this indicator will light up. For further information on reading the indicator, see page 37.

ECM00052

NOTICE

Do not continue to run the engine if the overheat-alert indicator is on. Serious engine damage will occur.

Page 43

Engine control system

EMU26803

Alert system

ECM00091

NOTICE

Do not continue to operate the engine if a alert device has activated. Consult your Yamaha dealer if the problem cannot be located and corrected.

EMU2681A

Overheat alert

This engine has an overheat-alert device. If the engine temperature rises too high, the alert device will activate.

The engine speed will automatically de-

●

crease to about 2000 r/min. The overheat-alert indicator will light or

●

blink.

gine and check the cooling water inlets:

●

Check trim angle to be sure that the cooling water inlet is submerged.

●

Check the cooling water inlet for clogging.

ZMU03026

EMU3016A

Low oil pressure alert

If the oil pressure drops too low, the alert device will activate.

●

The engine speed will automatically decrease to about 2000 r/min. If equipped with a low oil pressure-alert indicator, it will light or blink.

ZMU06509

The buzzer will sound (if equipped on the

●

tiller handle, remote control box, or main switch panel).

If the alert system has activated, stop the en-

ZMU06510

●

The buzzer will sound (if equipped on the tiller handle, remote control box, or main switch panel).

Page 44

Engine control system

ZMU02360

If the alert system has activated, stop the engine as soon as it is safe to do so. Check the oil level and add oil as needed. If the oil level is correct and the alert device does not switch off, consult your Yamaha dealer.

Page 45

EMU26902

Installation

The information presented in this section is intended as reference only. It is not possible to provide complete instructions for every possible boat and motor combination. Proper mounting depends in part on experience and the specific boat and motor combination.

EWM01590

WARNING

●

Overpowering a boat could cause severe instability. Do not install an outboard motor with more horsepower than the maximum rating on the capacity plate of the boat. If the boat does not have a capacity plate, consult the boat manufacturer.

●

Improper mounting of the outboard motor could result in hazardous conditions such as poor handling, loss of control, or fire hazards. For permanently mounted models, your dealer or other person experienced in proper rigging should mount the motor.

EMU33470

Mounting the outboard motor

The outboard motor should be mounted so that the boat is well balanced. Otherwise, the boat could be hard to steer. For single-engine boats, mount the outboard motor on the centerline (keel line) of the boat.

Installation

1. Center line (keel line)

EMU26923

Mounting height

To run your boat at optimum efficiency, the water resistance (drag) of the boat and outboard motor must be made as little as possible. The mounting height of the outboard motor greatly affects the water resistance. If the mounting height is too high, cavitation tends to occur, thus reducing the propulsion; and if the propeller tips cut the air, the engine speed will rise abnormally and cause the engine to overheat. If the mounting height is too low, the water resistance will increase and thereby reduce engine efficiency. Mount the outboard motor so that the anti-cavitation plate is between the bottom of the boat and a level 25 mm (1 in) below it.

ZMU01760

Page 46

Installation

ECM01631

NOTICE

●

Check that the idle hole stays high enough to keep out water getting inside engine even if the boat is in stationary with maximum load.

●

Incorrect engine height or obstructions to the smooth flow of water (such as the design or condition of the boat, or accessories such as transom ladders or depth finder transducers) can create airborne water spray while the boat is cruising. If the motor is operated continuously in the presence of airborne water spray, enough water could enter the engine through the intake opening on the cowling to cause severe engine damage. Eliminate the cause of the airborne water spray.

IP:

●

The optimum mounting height of the outboard motor is affected by the boat and motor combination and the desired use. Test runs at different heights can help determine the optimum mounting height. Consult your Yamaha dealer or boat manufacturer for further information on determining the proper mounting height.

●

For instructions on setting the trim angle of the outboard motor, see page 59.

EMU26972

Clamping the outboard motor

1. Place the outboard motor on the tran-

som so that it is positioned as close to the center as possible. Tighten the transom clamp screws evenly and securely. Occasionally check the clamp screws for tightness during operation of the outboard motor because they could become loose due to engine vibration.

WARNING! Loose clamp screws could allow the outboard motor to fall off or move on the transom. This could cause loss of control and serious injury. Make sure the transom screws are tightened securely. Occasionally check the screws for tightness during operation.

2. If the restraint cable attachment is

equipped on your engine, a restraint cable or chain should be used. Attach one end to the restraint cable attachment and the other to a secure mounting point on the boat. Otherwise the engine could be completely lost if it accidentally falls off the transom.

[EWM00641]

ZMU02012

Page 47

ZMU02013

3. Secure the clamp bracket to the transom using the bolts provided with the outboard (if packed). For details, consult your Yamaha dealer.

WARNING! Avoid using bolts, nuts or washers other than those contained in the engine packaging. If used, they must be of at least the same quality of material and strength and must be tightened securely. After tightening, test run the engine and check their tightness.

[EWM00651]

Installation

1. Bolts

ZMU02637

Page 48

Operation

EMU36381

First-time operation

EMU36391

Fill engine oil

The engine is shipped from the factory without engine oil. If your dealer did not fill the oil, you must fill it before starting the engine.

NOTICE:

with oil before first-time operation to avoid severe engine damage.

The engine is shipped with the following sticker, which should be removed after engine oil is filled for the first time. For more information on checking the engine oil level, see page 45.

EMU30174

Breaking in engine

Your new engine requires a period of breakin to allow mating surfaces of moving parts to wear in evenly. Correct break-in will help ensure proper performance and longer engine life.

procedure could result in reduced engine life or even severe engine damage.

EMU27085

Procedure for 4-stroke models

Your new engine requires a period of 10 hours break-in to allow mating surfaces of moving parts to wear in evenly.

IP:

Run the engine in the water, under load (in gear with a propeller installed) as follows.

Check that the engine is filled

[ECM01781]

NOTICE:

Failure to follow the break-in

ZMU01710

[ECM00801]

For 10 hours for breaking in engine avoid extended idling, rough water and crowded areas.

1. For the first hour of operation: Run the engine at varying speeds up to 2000 r/min or approximately half throttle.

2. For the second hour of operation: Increase engine speed as much as necessary to put the boat on plane (but avoid full-throttle operation), then back off on the throttle while keeping the boat at a planing speed.

3. Remaining 8 hours: Run the engine at any speed. However, avoid operating at full throttle for more than 5 minutes at a time.

4. After the first 10 hours: Operate the engine normally.

EMU36400

Getting to know your boat

Different boats handle differently. Operate cautiously while you learn how your boat handles under different conditions and with different trim angles (see page 59).

EMU36412

Checks before starting engine

EWM01920

WARNING

If any item in the checks before starting engine is not working properly, have it inspected and repaired before operating the outboard motor. Otherwise an accident could occur.

ECM00120

NOTICE

Do not start the engine out of water. Overheating and serious engine damage can occur.

EMU36560

Fuel level

Be sure you have plenty of fuel for your trip.

Page 49

Operation

A good rule is to use 1/3 of your fuel to get to the destination, 1/3 to return, and to keep 1/ 3 as an emergency reserve. With the boat level on a trailer or in the water, check the fuel level. For fuel filling instructions, see page 46.

EMU36570

Remove cowling

For the following checks, remove the top cowling from the engine. To remove the engine top cowling, release the lock lever and lift off the cowling.

ZMU06085

EMU36442

Fuel system

EWM00060

WARNING

Gasoline and its vapors are highly flammable and explosive. Keep away from sparks, cigarettes, flames, or other sources of ignition.

EWM00910

WARNING

Leaking fuel can result in fire or explosion.

●

Check for fuel leakage regularly.

●

If any fuel leakage is found, the fuel system must be repaired by a qualified mechanic. Improper repairs can make the outboard unsafe to operate.

EMU36451

Check for fuel leaks

●

Check for fuel leaks or gasoline fumes in the boat. Check for fuel leakage from the fuel sys-

●

tem. Check the fuel tank and fuel lines for

●

cracks, swellings, or other damages.

EMU37320

Check the fuel filter

Check that the fuel filter is clean and free of water. If any water is found in the fuel, or if a significant amount of debris is found, the fuel tank should be checked and cleaned by a Yamaha dealer.

ZMU06513

EMU38900

Controls

Tiller handle models:

●

Move the tiller handle fully to the left and right to make sure operation is smooth. Turn the throttle grip from the fully closed

●

to the fully open position. Make sure that it turns smoothly and that it completely returns to the fully closed position.

●

Look for loose or damaged connections of the throttle cable and shift link.

Remote control models:

●

Turn the steering wheel full-right and fullleft. Make sure operation is smooth and unrestricted throughout the whole range with no binding or excessive free play. Operate the throttle levers several times to

●

Page 50

Operation

make sure there is no hesitation in their travel. Operation should be smooth over the complete range of motion, and each lever should return completely to the idle position. Look for loose or damaged connections of

●

the throttle and shift cables.

ZMU06590

1. Cord

2. Clip

3. Engine shut-off switch

ZMU02003

ZMU06589

EMU36481

Engine shut-off cord (lanyard)

Inspect the engine shut-off cord for damage, such as cuts, breaks, and wear.

1. Cord

2. Clip

3. Engine shut-off switch

1. Cord

2. Clip

3. Engine shut-off switch

Page 51

Operation

EMU27166

Engine oil

1. Put the outboard motor in an upright position (not tilted).

NOTICE:

If the motor is not level, the oil level indicated on the dipstick may not be accurate.

[ECM01790]

2. Remove oil dipstick and wipe it clean.

3. Insert the dipstick and remove it again. Be sure to completely insert the dipstick into the dipstick guide, otherwise the oil level measurement will be incorrect.

4. Check the oil level using the dipstick to be sure the level falls between the upper and lower marks. Fill with oil if it is below the lower mark, or drain to the specified level if it is above the upper mark.

3. Upper level mark

EMU27153

Engine

●

Check the engine and engine mounting.

●

Look for loose or damaged fasteners.

●

Check the propeller for damage.

●

Check for engine oil leaks.

EMU36490

Flushing device

Check that flushing device’s garden hose connector is securely screwed on to the fitting on the bottom cowling.

NOTICE:

If the flushing device is not properly connected, cooling water can leak out and the engine can overheat during operation.

[ECM01800]

1. Oil dipstick

2. Lower level mark

ZMU06515

1. Fitting

2. Flushing device

EMU36953

ZMU06517

Install cowling

1. Be sure that a cowling lock lever is re-

leased.

2. Be sure that the rubber seal is seated all

the way around the top cowling.

3. Place the top cowling on bottom cowl-

ZMU06516

ing.

4. Check to be sure the rubber seal fits cor-

rectly all the way around the engine.

5. Move the lever to lock the cowling as

shown.

NOTICE:

If the cowling is not

Page 52

Operation

installed correctly, water spray under the cowling can damage the engine, or the cowling can blow off at high speeds.

[ECM01990]

ZMU06110

After installing, check the fitting of the top cowling by pushing it with both hands. If the top cowling is loose, have it repaired by your Yamaha dealer.

EMU38910

Checking power trim and tilt system

EWM01970

WARNING

Never get under the lower unit while it

●

is tilted, even when the tilt support knob is locked. Severe injury could occur if the outboard motor accidentally falls. Body parts can be crushed between the

●

motor and the clamp bracket when the motor is trimmed or tilted.

●

Be sure no one is near the outboard

motor before performing this check.

1. Check the power trim and tilt unit for any

sign of oil leaks.

ZMU02828

1. Trim and tilt rod

2. Operate each of the power trim and tilt

switches to check that all switches work.

3. Tilt the outboard motor up and check

that the trim and tilt rod is pushed out completely.

4. Check that the trim and tilt rod is free of

corrosion or other flaws.

5. Tilt the outboard motor down. Check

that the trim and tilt rod operates smoothly.

EMU36582

Battery

Check that the battery is in good condition, and fully charged. Check that the battery connections are clean, secure and covered by insulating covers. The electrical contacts of the battery and cables must be clean and properly connected or the battery will not start the engine. Refer to the battery manufacturer’s instructions for checks for your particular battery.

EMU27437

Filling fuel

EWM01830

WARNING

●

Gasoline and its vapors are highly flam-

Page 53

Operation

mable and explosive. Always refuel according to this procedure to reduce the risk of fire and explosion.

●

Gasoline is poisonous and can cause injury or death. Handle gasoline with care. Never siphon gasoline by mouth. If you should swallow some gasoline or inhale a lot of gasoline vapor, or get some gasoline in your eyes, see your doctor immediately. If gasoline spills on your skin, wash with soap and water. If gasoline spills on your clothing, change your clothes.

1. Be sure the engine is stopped.

2. Disconnect the fuel line from the fuel tank and tighten the air vent screw on the fuel tank cap.

trailered.

5. Do not smoke and keep away from sparks, flames, static electric discharge, or other sources of ignition.

6. If you use a portable container to store and dispense fuel, use only an approved GASOLINE container.

7. Touch the fuel nozzle to the filler opening or funnel to help prevent electrostatic sparks.

8. Fill the fuel tank, but do not overfill. Fuel can expand and overflow if the temperature increases.

Fuel tank capacity:

24 L (6.34 US gal, 5.28 Imp.gal)

ZMU06598

ZMU02301

3. Remove the portable tank from the boat.

4. Be sure you are in a well-ventilated outdoor area, either securely moored or

ZMU02834

9. Tighten the filler cap securely.

10. Wipe up any spilled gasoline immediately with dry rags. Dispose rags properly according to local laws or regulations.

EMU27451

Operating engine

EMU27466

Sending fuel (portable tank)

EWM00420

WARNING

●

Before starting the engine, make sure that the boat is tightly moored and that you can steer clear of any obstructions. Be sure there are no swimmers in the

Page 54

Operation

water near you.

●

When the air vent screw is loosened, gasoline vapor will be released. Gasoline is highly flammable, and its vapors are flammable and explosive. Refrain from smoking, and keep away from open flames and sparks while loosening the air vent screw. This product emits exhaust gases

●

which contain carbon monoxide, a colorless, odorless gas which could cause brain damage or death when inhaled. Symptoms include nausea, dizziness, and drowsiness. Keep cockpit and cabin areas well ventilated. Avoid blocking exhaust outlets.

1. If there is an air vent screw on the fuel tank cap, loosen it 2 or 3 turns.

ZMU02295

2. If there is a fuel joint on the motor, firmly connect the fuel line to the joint. Then firmly connect the other end of the fuel line to the joint on the fuel tank.

ZMU06520

ZMU02024

IP:

Wipe up any spilled gasoline immediately with dry rags. Dispose rags properly according to local laws or regulations.

3. Squeeze the primer pump, with the arrow pointing up, until you feel it become firm. During engine operation place the tank horizontally, otherwise fuel cannot be drawn from the fuel tank.

1. Arrow

Page 55

Operation

EMU27493

Starting engine

EWM01600

WARNING

Before starting the engine, make sure that the boat is tightly moored and that you can steer clear of any obstructions. Be sure there are no swimmers in the water near you.

EMU39011

Starting engine

EWM01840

WARNING

●

Avoid accidentally pulling the cord during normal operation. Loss of engine power means the loss of most steering control. Also, without engine power, the boat could slow rapidly. This could cause people and objects in the boat to be thrown forward.

IP:

The start-in-gear protection device prevents the engine from starting except when in neutral.

2. Attach the engine shut-off cord to a secure place on your clothing, or your arm or leg. Then install the clip on the other end of the cord into the engine shut-off switch.

ZMU02026

3. Place the throttle grip in the “” (start) position.

Starting procedure (cold engine)

1. Place the gear shift lever in neutral.

ZMU06522

4. Pull the manual starter handle slowly until you feel resistance. Then give a strong pull straight out to crank and start the engine. Repeat if necessary.

ZMU06521

Page 56

Operation

ZMU06523

5. After the engine starts, slowly return the manual starter handle to its original position before releasing it.

IP:

When the engine is cold, it needs to be warmed up. For further information, see page 55.

6. Slowly return the throttle grip to the fully closed position.

Starting procedure (warm engine)

1. Place the gear shift lever in neutral.

ZMU06521

IP:

The start-in-gear protection device prevents the engine from starting except when in neutral.

2. Attach the engine shut-off cord to a secure place on your clothing, or your arm or leg. Then install the clip on the other end of the cord into the engine shut-off switch.

ZMU02026

3. Open the throttle grip as shown in the illustration.

ZMU06609

IP:

●

If the throttle is opened too much, the engine speed rises rapidly, causing the outboard motor to swivel toward the starboard side.

●

Do not repeat opening and closing of the throttle grip as this cause the spark plug to wet with fuel and prevent from the engine to start.

4. Hold this throttle grip position by tightening the throttle friction adjuster.

Page 57

ZMU06608

5. Pull the manual starter handle slowly until you feel resistance. Then give a strong pull straight out to crank and start the engine. Repeat if necessary.

Operation

off cord to a secure place on your clothing, or your arm or leg while operating. Do not attach the cord to clothing that could tear loose. Do not route the cord where it could become entangled, preventing it from functioning.

●

1. Place the gear shift lever in neutral.

6. After the engine starts, slowly return the manual starter handle to its original position before releasing it.

7. Loosen the throttle friction adjuster and return the throttle to the fully closed position.

WARNING! Loosen the throttle friction adjuster. If there is too much resistance, it could be difficult to move the throttle grip, which could result in an accident.

EMU27595

[EWM02250]

Electric start / prime start models

EWM01840

WARNING

●

Failure to attached engine shut-off cord could result in a runaway boat if operator is ejected. Attach the engine shut-

ZMU06523

IP:

The start-in-gear protection device prevents the engine from starting except when in neutral.

2. Attach the engine shut-off cord to a secure place on your clothing, or your arm or leg. Then install the clip on the other end of the cord into the engine shut-off switch.

Page 58

Operation

3. Place the throttle grip in the “” (start) position. After the engine starts, return the throttle to the fully closed position.

4. Turn the main switch to “” (start), and hold it for a maximum of 5 seconds.

5. Immediately after the engine starts, release the main switch and allow it to return to “” (on).

NOTICE:

Never turn the main switch to “” (start) while the engine is running. Do not

●

EMU27604

Electric start/prime start models

EWM01840

●

1. Place the gear shift lever in neutral.

keep the starter motor turning for more than 5 seconds. If the starter motor is turned continuously for more than 5 seconds, the battery will be quickly discharged, thus making it impossible to start the engine. The starter can also be damaged. If the engine will not start after 5 seconds of cranking, return the main switch to “” (on), wait 10 seconds, then crank the engine again.

[ECM00192]

IP:

When the engine is cold, it needs to be warmed up. For further information, see page 55. If the engine is warm and fails to start, open the throttle slightly and try to start the engine again. If the engine still fails to start, see page 89.

WARNING

Failure to attached engine shut-off cord could result in a runaway boat if operator is ejected. Attach the engine shutoff cord to a secure place on your clothing, or your arm or leg while operating. Do not attach the cord to clothing that could tear loose. Do not route the cord where it could become entangled, preventing it from functioning. Avoid accidentally pulling the cord during normal operation. Loss of engine power means the loss of most steering control. Also, without engine power, the boat could slow rapidly. This could cause people and objects in the boat to be thrown forward.

Page 59

Operation

ZMU06521

IP:

4. Push the starter button to start the en-

The start-in-gear protection device prevents the engine from starting except when in neutral.

2. Attach the engine shut-off cord to a secure place on your clothing, or your arm or leg. Then install the clip on the other end of the cord into the engine shut-off switch.

5. Immediately after the engine starts, re-

ZMU02026

3. Place the throttle grip in the “” (start) position. After the engine starts, return the throttle to the fully closed position.

●

ZMU06522

gine.

ZMU06526

lease the starter button and allow it to return to its original position.

NOTICE:

Never push the starter button while the engine is running. Do not keep the starter motor turning for more than 5 seconds. If the starter motor is turned continuously for more than 5 seconds, the battery will be quickly discharged, thus making it impossible to start the engine. The starter can also be damaged. If the engine will not start after 5 seconds of cranking, release the starter button, wait 10 seconds, then crank the engine again.

[ECM00161]

IP:

When the engine is cold, it needs to be

Page 60

Operation

warmed up. For further information, see page 55. If the engine is warm and fails to start,

●

open the throttle slightly and try to start the engine again. If the engine still fails to start, see page 89.

6. Slowly return the throttle grip to the fully closed position.

EMU27664

Electric start and remote control models

EWM01840

WARNING

●

the engine from starting except when in neutral.

2. Attach the engine shut-off cord to a secure place on your clothing, or your arm or leg. Then install the clip on the other end of the cord into the engine shut-off switch.

3. Turn the main switch to “” (on).

4. Turn the main switch to “” (start), and hold it for a maximum of 5 seconds.

1. Place the remote control lever in neutral.

IP:

The start-in-gear protection device prevents

5. Immediately after the engine starts, release the main switch and allow it to return to “” (on).

NOTICE:

Never turn the main switch to “” (start) while the engine is running. Do not keep the starter motor turning for more than 5 seconds. If the starter motor is turned continuously for more than 5 seconds, the battery will be quickly discharged, thus making it impossible to start the engine. The

Page 61

starter can also be damaged. If the

engine will not start after 5 seconds of cranking, return the main switch to “” (on), wait 10 seconds, then crank the engine again.

[ECM00192]

IP:

●

When the engine is cold, it needs to be warmed up. For further information, see page 55.

●

If the engine is warm and fails to start, open the throttle slightly and try to start the engine again. If the engine still fails to start, see page 89.

EMU36510

Checks after starting engine

EMU36520

Cooling water

Check for a steady flow of water from the cooling water pilot hole. A continuous flow of water from the pilot hole shows that the water pump is pumping water through the cooling passages. If the cooling passages are frozen, it may take a while for water to start flowing out of the pilot hole.

ECM01810

NOTICE

If water is not flowing out of the pilot hole at all times while the engine is running, overheating and serious damage could occur. Stop the engine and check whether the cooling water inlet on the lower case or the cooling water pilot hole is blocked. Consult your Yamaha dealer if the problem cannot be located and corrected.

Operation

Check that no water leaks from the joints between the exhaust cover, cylinder head, and body cylinder.

EMU27670

Warming up engine

EMU27715

Manual start and electric start models

1. After starting the engine, allow it to idle for 3 minutes to warm up. Failure to do so will shorten engine life.

2. Be sure the low oil pressure-alert indicator goes off after starting the engine.

NOTICE:

indicator blinks after the engine starts, stop the engine. Otherwise serious engine damage could occur. Check the oil level and add oil if necessary. Consult your Yamaha dealer if the cause for the low oil pressurealert indicator cannot be found.

[ECM01830]

EMU36530

Checks after engine warm-up

EMU36540

Shifting

While tightly moored, and without applying throttle, confirm that the engine shifts smoothly into forward and reverse, and back to neutral.

If the low oil pressure-alert

Page 62

Operation

EMU36980

Stop switches

●

Turn the main switch to “”, or press the engine stop button and make sure the engine stops.

●

Confirm that removing the clip from the engine shut-off switch stops the engine.

●

Confirm that the engine cannot be started with the clip removed from the engine shut-off switch.

EMU34561

Shifting

EWM00180

WARNING

Before shifting, make sure there are no swimmers or obstacles in the water near you.

ECM01610

NOTICE

Warm up the engine before shifting into gear. Until the engine is warm, the idle speed may be higher than normal. High idle speed can prevent you from shifting back to neutral. If this occurs, stop the engine, shift to neutral, then restart the engine and allow it to warm up.

2. Move the remote control lever / gear shift lever firmly and crisply forward (for forward gear) or backward (for reverse gear) [about 35° (a detent can felt) for remote control models]. Be sure to check that the tilt lock lever is in the lock/down position (if equipped) before operating in reverse.

ZMU06528

To shift out of neutral

1. Pull the neutral interlock trigger up (if equipped).

1. Neutral interlock trigger

ZMU06531

Page 63

Operation

IP:

Tiller handle models: The gear shift lever operates only when the throttle grip is in the fully closed position. To shift from in gear (forward/reverse) to neutral

1. Close the throttle so that the engine slows to idle speed.

2. After the engine is at idle speed in gear move the remote control lever / gear shift lever firmly and crisply into the neutral position.

ZMU06521

ZMU06522

Page 64

Operation

EMU31742

Stopping boat

EWM01510

WARNING

Do not use the reverse function to slow

●

down or stop the boat as it could cause you to lose control, be ejected, or impact the steering wheel or other parts of the boat. This could increase the risk of serious injury. It could also damage the shift mechanism.

●

Do not shift into reverse while traveling at planing speeds. Loss of control, boat swamping, or damage to the boat could occur.

ZMU02083

The boat is not equipped with a separate braking system. Water resistance stops it after the throttle lever is moved back to idle. The stopping distance varies depending on gross weight, water surface conditions, and wind direction.

EMU27821

Stopping engine

Before stopping the engine, first let it cool off for a few minutes at idle or low speed. Stopping the engine immediately after operating at high speed is not recommended.

EMU27845

Procedure

1. Push and hold the engine stop button or turn the main switch to “” (off).

Page 65

Operation

2. After stopping the engine, disconnect the fuel line if there is a fuel joint on the outboard motor.

ZMU06533

3. Tighten the air vent screw on the fuel tank cap (if equipped).

ZMU02301

4. Remove the key if the boat will be left unattended.

IP:

The engine can also be stopped by pulling the cord and removing the clip from the engine shut-off switch, then turning the main switch to “” (off).

EMU27862

Trimming outboard motor

EWM00740

WARNING

Excessive trim for the operating conditions (either trim up or trim down) can cause boat instability and can make steering the boat more difficult. This increases the possibility of an accident. If

the boat begins to feel unstable or is hard to steer, slow down and/or readjust the trim angle.

The trim angle of the outboard motor helps determine the position of the bow of the boat in the water. Correct trim angle will help improve performance and fuel economy while reducing strain on the engine. Correct trim angle depends upon the combination of boat, engine, and propeller. Correct trim is also affected by variables such as the load in the boat, sea conditions, and running speed.

1. Trim operating angle

EMU38880

Adjusting trim angle for manual tilt models

EWM00400

WARNING

Stop the engine before adjusting the

●

trim angle. Use care to avoid being pinched when

●

removing or installing the rod.

●

Use caution when trying a trim position for the first time. Increase speed gradually and watch for any signs of instability or control problems. Improper trim angle can cause loss of control.

There are 4 or 5 holes provided in the clamp bracket to adjust the outboard motor trim an-

Page 66

Operation

gle.

1. Stop the engine.

2. Tilt the outboard motor up and remove the trim rod by pressing clip.

1. Trim rod

ZMU06566

3. Reposition the rod in the desired hole.

To raise the bow (“trim-out”), move the rod away from the transom.

ZMU06536

To lower the bow (“trim-in”), move the rod toward the transom.

Make test runs with the trim set to different angles to find the position that works best for your boat and operating conditions.

IP:

The outboard motor trim angle can be changed approximately 4 degrees by shifting the trim rod one hole.

EMU27885

Adjusting trim angle (Power trim and tilt)

EWM00753

WARNING

●

Be sure all people are clear of the outboard motor when adjusting the trim angle. Body parts can be crushed between the motor and the clamp bracket when the motor is trimmed or tilted.

●

Use caution when trying a trim position for the first time. Increase speed gradually and watch for any signs of instability or control problems. Improper trim angle can cause loss of control. If equipped with a power trim and tilt

●

switch located on the bottom cowling, use the switch only when the boat is at a complete stop with the engine off. Do not adjust the trim angle with this switch while the boat is moving.

Adjust the outboard motor trim angle using the power trim and tilt switch.

ZMU06535

Page 67

1. Power trim and tilt switch

Operation

angles to find the position that works best for your boat and operating conditions.

EMU27911

Adjusting boat trim

When the boat is on plane, a bow-up attitude results in less drag, greater stability and efficiency. This is generally when the keel line of the boat is up about 3 to 5 degrees. With the bow up, the boat may have a greater tendency to steer to one side or the other. Compensate for this as you steer. The trim tab can also be adjusted to help offset this effect. When the bow of the boat is down, it is easier

ZMU06495

to accelerate from a standing start onto plane.

1. Power trim and tilt switch

To raise the bow (trim-out), press the switch “” (up). To lower the bow (trim-in), press the switch “” (down). Make test runs with the trim set to different

Bow Up

Too much trim-out puts the bow of the boat too high in the water. Performance and economy are decreased because the hull of the boat is pushing the water and there is more air drag. Excessive trim-out can also cause the propeller to ventilate, which reduces performance further, and the boat may “por- poise” (hop in the water), which could throw the operator and passengers overboard.

Page 68

Operation

Bow Down

Too much trim-in causes the boat to “plow” through the water, decreasing fuel economy and making it hard to increase speed. Operating with excessive trim-in at higher speeds also makes the boat unstable. Resistance at the bow is greatly increased, heightening the danger of “bow steering” and making operation difficult and dangerous.

IP:

Depending on the type of boat, the outboard motor trim angle may have little effect on the trim of the boat when operating.

EMU27934

Tilting up and down

If the engine will be stopped for some time or if the boat is moored in shallows, the outboard motor should be tilted up to protect the propeller and lower casing from damage by collision with obstructions, and also to reduce salt corrosion.

EWM00221

WARNING

Be sure all people are clear of the outboard motor when tilting up and down, Body parts can be crushed between the motor and the clamp bracket when the motor is trimmed or tilted.

EWM00250

WARNING

Leaking fuel is a fire hazard. If there is a fuel joint on the outboard motor, disconnect the fuel line or close the fuel cock if the engine will be tilted for more than a few minutes. Otherwise fuel may leak.

ECM00241

NOTICE

●

Before tilting the outboard motor, stop the engine by following the procedure on page 58. Never tilt the outboard motor while the engine is running. Severe damage from overheating can result.

●

Do not tilt up the engine by pushing the tiller handle (if equipped) because this could break the handle.

EMU2797B

Procedure for tilting up (manual tilt models)

1. Place the remote control lever / gear shift lever in neutral.

ZMU03087

Page 69

ZMU06521

2. Disconnect the fuel line from the outboard motor.

Operation

the lock position automatically.

NOTICE:

lever or knob when trailering the boat. The outboard motor could shake loose from the tilt support and fall. If the motor cannot be trailered in the normal running position, use an additional support device to secure it in the tilt position. For more detailed information, see page 69.

Do not use the tilt support

[ECM01641]

ZMU06503

ZMU06533

3. Place the tilt lock lever (if equipped) in the release/up position.

ZMU06539

4. Pull up the shallow water lever (if equipped).

5. Hold the rear of the top cowling with one hand and tilt the engine up fully.

6. Push the tilt support knob into the clamp bracket. Or the tilt support bar will turn to

EMU32723

Procedure for tilting up (power trim and tilt models)

1. Place the remote control lever / gear shift lever in neutral.

ZMU03196

Page 70

Operation

2. Press the power trim and tilt switch “” (up) until the outboard motor has tilted up completely.

ZMU06537

3. Push the tilt support knob into the clamp bracket to support the engine.

WARNING! After tilting the outboard motor, be sure to support it with the tilt support knob or tilt support lever. Otherwise the outboard motor could fall back down suddenly if oil in the power trim and tilt unit or in the power tilt unit loses pressure.

NOTICE:

Do not use the tilt support

[EWM00262]

[ECM01641]

ZMU06543

4. Models equipped with trim rods: Once the outboard motor is supported with the tilt support lever, press the power trim

Page 71

and tilt switch “” (down) to retract the trim rods.

NOTICE:

Be sure to retract the trim rods completely during mooring. This protects the rods from marine growth and corrosion which could damage the power trim and tilt mechanism.

EMU30192

[ECM00251]

Procedure for tilting down (manual tilt models)

1. Place the tilt lock lever in the lock position.

ZMU02306

2. Slightly tilt the engine up until the tilt support bar is automatically released.

3. Slowly tilt the engine down.

EMU33120

Procedure for tilting down (power trim and tilt models)

1. Push the power trim and tilt switch “” (up) until the outboard motor is supported by the tilt rod and the tilt support knob becomes free.

2. Pull out the tilt support knob.

Operation

ZMU06545

3. Push the power trim and tilt switch “” (down) to lower the outboard motor to the desired position.

ZMU01936

ZMU06546

Page 72

Operation

EMU28061

Shallow water

EMU28073

Cruising in shallow water (manual tilt models)

EWM01781

WARNING

Run the boat at the lowest possible

●

speed when using the shallow water cruising system. The tilt lock mechanism does not work while the shallow water cruising system is being used. Hitting an underwater obstacle could cause the outboard motor to lift out of the water, resulting in loss of control.

●

Use extra care when operating in reverse. Too much reverse thrust can cause the outboard motor to lift out of the water, increasing the chance of accident and personal injury.

ECM00260

NOTICE

Do not tilt the outboard motor up so that the cooling water inlet on the lower unit is above the surface of the water when setting up for and cruising in shallow water. Otherwise severe damage from overheating can result.

EMU28125

Procedure

1. Place the remote control lever / gear shift lever in neutral.

ZMU03087

ZMU06521

2. Place the tilt lock lever in the release/up position.

Page 73

Operation

ZMU06539

3. Slightly tilt the outboard motor up. The tilt support bar will lock automatically, supporting the outboard motor in a partially raised position. This outboard motor has 2 positions for shallow water cruising.

ZMU04851

4. To return the outboard motor to the normal running position, place the remote control lever / gear shift lever in neutral.

5. Place the tilt lock lever in the lock/down position, then slightly tilt the outboard motor up until the tilt support bar automatically returns to the free position.

ZMU02306

6. Slowly lower the outboard motor to the normal position.

EMU32851

Power trim and tilt models

The outboard motor can be tilted up partially to allow operation in shallow water.

ECM00260

NOTICE

EMU32912

Procedure for power trim and tilt models

1. Place the remote control lever / gear shift lever in neutral.

Page 74

Operation

2. Slightly tilt the outboard motor up to the desired position using the power trim and tilt switch.

WARNING! Using the power trim and tilt switch on the bottom cowling while the boat is moving or engine is on could increase the risk of falling overboard and could distract the operator, increasing the risk of collision with another boat or an obstacle.

[EWM01850]

ZMU01935

3. To return the outboard motor to the normal running position, press the power trim and tilt switch and slowly tilt the outboard motor down.

EMU28195

Cruising in other conditions

Cruising in salt water

After operating in salt water, flush the cooling water passages with fresh water to prevent them from becoming clogged. Also rinse the outside of the outboard motor with fresh water.

Cruising in muddy, turbid, or acidic water

Yamaha strongly recommends that you use the optional chromium-plated water pump kit (see page 19) if you use the outboard motor in acidic water or water with a lot of sediment in it, such as muddy or turbid (cloudy) water. After operating in such water, flush the cooling passages with fresh water to prevent corrosion. Also rinse the outside of the outboard motor with fresh water.

ZMU06537

Page 75

Maintenance

EMU28227

Transporting and storing

outboard motor

EWM00693

WARNING

●

USE CARE when transporting fuel tank, whether in a boat or car.

●

DO NOT fill fuel container to maximum capacity. Gasoline will expand considerably as it warms up and can build up pressure in the fuel container. This can cause fuel leakage and a potential fire hazard.

EWM01860

WARNING

Leaking fuel is a fire hazard. When transporting and storing the outboard motor, close the fuel cock to prevent fuel from leaking. Never get under the engine while it is tilted. Severe injury could occur if the outboard motor accidentally falls.

ECM00660

NOTICE

Do not use the tilt support lever or knob when trailering the boat. The outboard motor could shake loose from the tilt support and fall. If the motor cannot be trailered in the normal running position, use an additional support device to secure it in the tilt position.

The outboard motor should be trailered and stored in the normal running position. If there is insufficient road clearance in this position, then trailer the outboard motor in the tilt position using a motor support device such as a transom saver bar. Consult your Yamaha dealer for further details.

EMU28235

Clamp screw mounting models

When transporting or storing the outboard

motor while removed from a boat, keep the outboard motor in the attitude shown.

ZMU06560

IP:

Place a towel or something similar under the outboard motor to protect it from damage.

EMU28241

Storing outboard motor

When storing your Yamaha outboard motor for prolonged periods of time (2 months or longer), several important procedures must be performed to prevent excessive damage. It is advisable to have your outboard motor serviced by an authorized Yamaha dealer prior to storage. However, you, the owner, with a minimum of tools, can perform the following procedures.

ECM01080

NOTICE

●

To prevent problems which can be caused by oil entering the cylinder from the sump, keep the outboard motor in the attitude shown when transporting

Page 76

Maintenance

and storing it. If storing or transporting the outboard motor on its side (not upright), put it on a cushion after draining the engine oil.

●

Do not place the outboard motor on its side before the cooling water has drained from it completely, otherwise water may enter the cylinder through the exhaust port and cause engine trouble.

●

Store the outboard motor in a dry, wellventilated place, not in direct sunlight.

ZMU03659

EMU28304

Procedure

EMU39020

Flushing in a test tank

ECM02130

NOTICE

Do not run the engine without supplying it with cooling water. Either the engine water pump will be damaged or the engine will be damaged from overheating.

Cooling system flushing is essential to prevent the cooling system from clogging up with salt, sand, or dirt. In addition, fogging of the engine is mandatory to prevent excessive engine damage due to rust. Perform the flushing and fogging at the same time.

1. Wash the outboard motor body using fresh water.

ter into the air intake.

NOTICE:

Do not spray wa-

[ECM01840]

For fur-

ther information, see page 72.

2. Disconnect the fuel line from the outboard motor.

3. Remove the engine top cowling and propeller. For further details, see page 82.

4. Install the outboard motor on a water tank. Fill the tank with fresh water until the anti-cavitation plate is immersed in water.

NOTICE:

If the fresh water level is below the level of the anti-cavitation plate, or if the water supply is insufficient, engine seizure may occur.

[ECM00291]

ZMU02051

1. Water surface

2. Lowest water level

5. Run the engine at a fast idle for 10–15 minutes in neutral position.

Do not touch or remove electrical parts when starting or during operation. Keep hands, hair, and clothes away from the flywheel and other rotating parts while the engine is running.

[EWM00091]

6. Just prior to turning off the engine, quickly spray “Yamaha Stor-Rite Engine Fogging Oil” alternately into the silencer cover. When properly done, the engine will smoke excessively and almost stall.

WARNING!

Page 77

ZMU06571

7. Remove the outboard motor from the test tank.

8. Drain the cooling water completely out of the motor. Clean the body thoroughly.

9. Install the top cowling.

10. Fill the fuel tank with fresh fuel and add one ounce of “Yamaha Fuel Conditioner and Stabilizer” to each gallon of fuel.

IP:

The use of “Yamaha Fuel Conditioner and Stabilizer” eliminates the need to drain the fuel system. Consult your Yamaha dealer or other qualified mechanic if the fuel system is to be drained instead.

11. Store the fuel tank in a dry, well-ventilated place, not in direct sunlight.

EMU28402

Lubrication

1. Install the spark plug(s) and torque to proper specification. For information on spark plug installation, see page 78.

2. Change the gear oil. For instructions, see page 84. Inspect the oil for the presence of water that indicates a leaky seal. Seal replacement should be performed by an authorized Yamaha dealer prior to use.

3. Grease all grease fittings. For further details, see page 77.

IP:

For long-term storage, fogging the engine

Maintenance

with oil is recommended. Contact your Yamaha dealer for information about fogging oil and procedures for your engine.

EMU28423

Cleaning and anticorrosion measures

1. Wash down the exterior of the outboard motor with fresh water and dry off completely.

into the air intake.

2. Spray the outboard motor exterior with “Yamaha Silicone Protectant”.

3. Wax the cowling with a non-abrasive wax such as “Yamaha Silicone Wax”.

EMU28443

Flushing power unit

Perform this procedure right after operation for the most thorough flushing.

ECM01530

NOTICE

Do not perform this procedure while the engine is running. The water pump may be damaged and severe damage from overheating can result.

1. After shutting off the engine, unscrew the garden hose connector from the fitting on the bottom cowling.

NOTICE:

Do not spray water

[ECM01840]

Page 78

Maintenance

1. Fitting

2. Garden hose connector

3. Garden hose adapter

of cooling the engine, which can cause serious overheating. Be sure the connector is tightened securely on the fitting after flushing the engine.

[ECM00541]

IP:

●

When flushing the engine with the boat in the water, tilting up the outboard motor un-

til it is completely out of the water will achieve better results.

●

For cooling system flushing instructions, see page 69.

EMU28451

Cleaning the outboard motor

After use, wash the exterior of the outboard motor with fresh water. Flush the cooling system with fresh water.

ZMU06553

2. Screw the garden hose adapter onto a garden hose, which is connected to a fresh water supply, and then connect it to the garden hose connector.

3. With the engine off, turn on the water tap and let the water flush through the cooling passages for about 15 minutes. Turn off the water and disconnect the garden hose adapter from the garden hose connector.

4. Reinstall the garden hose connector onto the fitting on the bottom cowling. Tighten the connector securely.

NOTICE:

Do not leave the garden hose connector loose on the bottom cowling fitting or let the hose hang free during normal operation. Water will leak out of the connector instead

EMU28460

Checking painted surface of motor

Check the motor for scratches, nicks, or flaking paint. Areas with damaged paint are more likely to corrode. If necessary, clean and paint the areas. A touch-up paint is available from your Yamaha dealer.

EMU2848A

Periodic maintenance

EWM01871

WARNING

These procedures require mechanical skills, tools, and supplies. If you do not have the proper skills, tools, or supplies to perform a maintenance procedure,

Page 79

Maintenance

have a Yamaha dealer or other qualified mechanic do the work. The procedures involve disassembling the motor and exposing dangerous parts. To reduce the risk of injury from moving, hot, or electrical parts:

●

Turn off the engine and keep the key(s) and engine shut-off cord (lanyard) with you when you perform maintenance unless otherwise specified.

●

The power trim and tilt switches operate even when the ignition key is off. Keep people away from the switches whenever working around the motor. When the motor is tilted, keep away from the area under it or between it and the clamp bracket. Be sure no one is in this area before operating the power trim and tilt mechanism.

●

Allow the engine to cool before handling hot parts or fluids.

●

Always completely reassemble the motor before operation.

Maintenance, replacement, or repair of the emission control devices and systems may be performed by any marine engine repair establishment or individual. All warranty repairs, however, including those to the emission control system, must be performed by an authorized Yamaha marine dealership.

A service manual is available for purchase through your Yamaha dealer for owners who have the mechanical skills, tools, and other equipment necessary to perform maintenance not covered by this owner’s manual.

EMU28511

Replacement parts

If replacement parts are necessary, use only genuine Yamaha parts or parts of equivalent design and quality. Any part of inferior quality

may malfunction, and the resulting loss of control could endanger the operator and passengers. Yamaha genuine parts and accessories are available from your Yamaha dealer.

EMU35520

Maintenance interval guidelines

The service intervals provided in the Maintenance Chart were developed based upon “typical” use that includes operating at varied speeds, with sufficient time for engine warm up and cool-down, a medium to light load, and an average cruising speed near the 3000 to 4000 rpm range. As with any engine, however, if your normal operating conditions are different, you should consider service more often than shown, especially how often you change your engine and gear oil. Examples might include extended wide-openthrottle use or long periods of trolling or idling, carrying heavy loads, or frequent starting and stopping or shifting. More frequent maintenance will often pay off many times over in increased engine life and greater owner satisfaction. Consult your Yamaha dealer for additional maintenance recommendations.

Page 80

Maintenance

EMU34445

Maintenance chart 1

IP:

●

Refer to the sections in this chapter for explanations of each owner-specific action.

●

The maintenance cycle on these charts assume usage of 100 hours per year and regular flushing of the cooling water passages. Maintenance frequency should be adjusted when operating the engine under adverse conditions such as extended trolling.

●

Disassembly or repairs may be necessary depending on the outcome of maintenance checks.

●

Expendable or consumable parts and lubricants will lose their effectiveness over time and through normal usage regardless of the warranty period.

●

When operating in salt water, muddy, other turbid (cloudy), acidic water, the engine should

be flushed with clean water after each use. The “” symbol indicates the check-ups which you may carry out yourself. The “” symbol indicates work to be carried out by your Yamaha dealer.

Initial Every

Item Actions

Anode(s) (external)

Anode(s) (cylinder head)

Anodes (exhaust cover, exhaust guide)

Battery (electrolyte level, terminal)

Cooling water leakage

Cowling lock lever Inspection

Engine starting condition/noise

Engine idling speed/ noise

Engine oil Replacement

Engine oil ﬁlter (cartridge)

Fuel ﬁlter (can be disassembled)

Fuel line(Low pressure)

Inspection or replacement as necessary

Replacement

Inspection

Fill, charging or replacing as necessary

Inspection or replacement as necessary

Inspection

Replacement

Inspection or replacement as necessary

Inspection

20 hours

months)

100

hours

(1 year)

300

hours

(3 years)

500

hours

(5 years)

Page 81

Item Actions

Fuel line(Low pressure)

Fuel pump

Fuel/engine oil leakage Inspection

Gear oil Replacement

Greasing points Greasing

Impeller/water pump housing

Power trim and tilt unit Inspection

Propeller/propeller nut/ cotter pin

Shift link/shift cable

Spark plug(s)

Spark plug caps/spark plug wires

Water from the cooling water pilot hole

Throttle link/throttle cable/throttle pick-up timing

Thermostat

Timing belt

Valve clearance

Water inlet Inspection

Main switch/stop switch

Wire harness connections/wire coupler connections

Inspection or replacement as necessary

Replacement

Inspection or replacement as necessary

Inspection, adjustment or replacement as necessary

Inspection or replacement as necessary

Inspection

Inspection, adjustment or replacement as necessary

Inspection or replacement as necessary

Inspection and adjustment

Inspection or replacement as necessary

Maintenance

Initial Every

20 hours

months)

100

hours

(1 year)

hours

(3 years)

300

500

hours

(5 years)

Page 82

Maintenance

Initial Every

Item Actions

(Yamaha) Fuel tank

EMU34451

Inspection and cleaning as necessary

20 hours

months)

Maintenance chart 2

Item Actions

Exhaust guide/exhaust manifold

Timing belt Replacement

EMU28910

Inspection or replacement as necessary

IP:

When using lead or high-sulfur gasoline, inspecting valve clearance may be required more frequently than every 500 hours.

100

hours

(1 year)

1000 hours

Every

300

hours

(3 years)

500

hours

(5 years)

Page 83

EMU28932

Greasing

Yamaha marine grease (Water resistant grease)

F25A, F25EA, T25A

Maintenance

ZMU06567

Page 84

Maintenance

F25EHA, F25MHA

EMU28956

Cleaning and adjusting spark plug

The spark plug is an important engine component and is easy to inspect. The condition of the spark plug can indicate something about the condition of the engine. For exam-

ZMU06554

ple, if the center electrode porcelain is very white, this could indicate an intake air leak or carburetion problem in that cylinder. Do not attempt to diagnose any problems yourself. Instead, take the outboard motor to a Yamaha dealer. You should periodically re-

Page 85

Maintenance

move and inspect the spark plug because heat and deposits will cause the spark plug to slowly break down and erode.

1. Remove the spark plug caps from the

spark plugs.

2. Remove the spark plug. If electrode ero-

sion becomes excessive, or if carbon and other deposits are excessive, you should replace the spark plug with another of the correct type.

WARNING! When removing or installing a spark plug, be careful not to damage the insulator. A damaged insulator could allow external sparks, which could lead to explosion or fire.

[EWM00561]

Standard spark plug:

DPR6EB-9

3. Be sure to use the specified spark plug, otherwise the engine may not operate properly. Before fitting the spark plug, measure the electrode gap with a wire thickness gauge; replace it if out of specification.

4. When fitting the plug, wipe off any dirt from the threads, and then screw it in to the correct torque.

Spark plug torque:

17.0 Nm (1.73 kgf-m, 12.5 ft-lb)

IP:

If a torque-wrench is not available when you are fitting a spark plug, a good estimate of the correct torque is 1/4 to 1/2 a turn past finger-tight. Have the spark plug adjusted to the correct torque as soon as possible with a torque-wrench.

EMU37450

Checking fuel filter

Check the fuel filter periodically. If any water or foreign matter is found in the filter, clean or replace it. For cleaning or replacement of the fuel filter, consult your Yamaha dealer.

ZMU06513

EMU29043

Inspecting idling speed

EWM00451

WARNING

●

Do not touch or remove electrical parts

1. Spark plug gap

2. Spark plug I.D. mark (NGK)

3. Spark plug part number

when starting or during operation.

●

Keep hands, hair, and clothes away from the flywheel and other rotating

Spark plug gap:

0.8–0.9 mm (0.031–0.035 in)

Page 86

Maintenance

parts while the engine is running.

ECM00490

NOTICE

This procedure must be performed while the outboard motor is in the water. A flushing attachment or test tank can be used.

If the boat is not equipped with a tachometer for the outboard motor, use a diagnostic tachometer for this procedure. Results may vary depending on whether testing is conducted with the flushing attachment, in a test tank, or with the outboard motor in the water.

1. Start the engine and allow it to warm up fully in neutral until it is running smoothly.

2. Once the engine has warmed up, verify whether the idle speed is set to specification. For idle speed specifications, see page 14. If you have difficulty verifying the idle speed, or the idle speed requires adjustment, consult a Yamaha dealer or other qualified mechanic.

EMU38802

Changing engine oil

ECM01710

NOTICE

Change the engine oil after the first 20 hours of operation or 3 months, and every 100 hours or at 1-year intervals thereafter. Otherwise the engine will wear quickly.

Extract the engine oil with an oil changer.

1. Put the outboard motor in an upright position (not tilted).

is not level, the oil level indicated on the dipstick may not be accurate.

[ECM01860]

NOTICE:

If the motor

ZMU03659

2. Start the engine. Warm it up and keep the idle speed for 5-10 minutes.

3. Stop the engine and leave it for 5-10 minutes.

4. Remove the top cowling.

5. Remove the oil filler cap. Pull out the dipstick and use the oil changer to extract the oil completely.

ZMU06591

1. Oil changer

IP:

If the oil changer is not available, remove the drain screw while holding a container under the drain hole. Let the oil drain completely. Wipe up any spilled oil immediately.

Page 87

1. Drain screw

ZMU06610

Maintenance

utes.

8. Remove oil dipstick and wipe it clean.

9. Insert the dipstick and remove it again. Be sure to completely insert the dipstick into the dipstick guide, otherwise the oil level measurement will be incorrect.

10. Recheck the oil level using the dipstick to be sure the level falls between the upper and lower marks. Consult your Yamaha dealer if the oil level is out of specified level.

6. Add the correct amount of oil through the filler hole. Put back the filler cap and the dipstick.

NOTICE:

Overfilling the oil could cause leakage or damage. If the oil level is above the upper level mark, drain until the level meets the specified capacity.

[ECM01850]

ZMU06561

1. Oil ﬁller cap

Recommended engine oil:

4-stroke outboard motor oil Total engine oil quantity (oil pan capacity):

Without oil filter replacement:

1.4 L (1.48 US qt, 1.23 Imp.qt)

With oil filter replacement:

1.6 L (1.69 US qt, 1.41 Imp.qt)

7. Leave the outboard motor for 5-10 min-

ZMU06516

1. Oil dipstick

2. Lower level mark

3. Upper level mark

11. Start the engine and make sure that the low oil pressure-alert indicator remains off. Also, make sure that there are no oil leaks.

NOTICE:

alert indicator comes on or if there are oil leaks, stop the engine and find the cause. Continued operation with a problem could cause severe engine damage. Consult your Yamaha dealer if the problem cannot be located and corrected.

12. Dispose of used oil according to local regulations.

IP:

For more information on the disposal of

●

used oil, consult your Yamaha dealer.

If the low oil pressure-

[ECM01622]

Page 88

Maintenance

●

Change the oil more often when operating the engine under adverse conditions such as extended trolling.

EMU29113

Checking wiring and connectors

●

Check that each connector is engaged securely.

●

Check that each ground lead is properly secured.

switch if your boat has one.

Do not use your hand to hold the propeller when loosening or tightening the propeller nut. Put a wood block between the anti-cavitation plate and the propeller to prevent the propeller from turning.

ZMU01897

Checkpoints

●

Check each of the propeller blades for erosion from cavitation or ventilation, or other damage.

●

Check the propeller shaft for damage. Check the splines for wear or damage.

●

Check for fish line tangled around the propeller shaft.

ZMU06562

EMU32112

Checking propeller

EWM01881

WARNING

You could be seriously injured if the engine accidentally starts when you are near the propeller. Before inspecting, removing, or installing the propeller, place the shift control in neutral, turn the main switch to “” (off) and remove the key, and remove the clip from the engine shutoff switch. Turn off the battery cut-off

Check the propeller shaft oil seal for dam-

●

age.

EMU30662

Removing propeller

EMU29197

Spline models

1. Straighten the cotter pin and pull it out

Page 89

Maintenance

using a pair of pliers.

2. Remove the propeller nut, washer, and spacer (if equipped).

WARNING! Do not use your hand to hold the propeller when loosening the propeller nut.

[EWM01890]

ZMU06564

1. Cotter pin

2. Propeller nut

3. Washer

4. Spacer

5. Propeller

6. Thrust washer

EMU30672

Installing propeller

EMU29233

Spline models

ECM00500

NOTICE

Be sure to use a new cotter pin and bend the ends over securely. Otherwise the propeller could come off during operation and be lost.

1. Apply Yamaha marine grease or a corrosion resistant grease to the propeller shaft.

2. Install the spacer (if equipped), thrust washer, washer (if equipped), and propeller on the propeller shaft.

Be sure to install the thrust washer before installing the propeller, otherwise the lower case and propeller boss could be damaged.

3. Install the spacer (if equipped) and the washer. Tighten the propeller nut to the specified torque.

Propeller nut tightening torque:

35.0 Nm (3.57 kgf-m, 25.8 ft-lb)

NOTICE:

[ECM01880]

ZMU06603

1. Cotter pin

2. Propeller nut

3. Washer

4. Propeller

5. Thrust washer

3. Remove the propeller, washer (if equipped), and thrust washer.

4. Align the propeller nut with the propeller shaft hole. Insert a new cotter pin in the hole and bend the cotter pin ends.

NOTICE:

Do not reuse the cotter pin installed. Otherwise the propeller can come off during operation.

[ECM01890]

Page 90

Maintenance

ZMU02063

ZMU03273

IP:

If the propeller nut does not align with the propeller shaft hole after tightening to the specified torque, tighten the nut further to align it with the hole.

EMU29287

Changing gear oil

EWM00800

WARNING

Be sure the outboard motor is securely

●

fastened to the transom or a stable stand. You could be severely injured if the outboard motor falls on you.

●

Never get under the lower unit while it is tilted, even when the tilt support lever or knob is locked. Severe injury could occur if the outboard motor accidentally falls.

1. Tilt the outboard motor so that the gear oil drain screw is at the lowest point possible.

2. Place a suitable container under the gear case.

3. Remove the gear oil drain screw and gasket.

sive quantity of metal particles on the magnetic gear oil drain screw, this can indicate lower unit problem. Consult your Yamaha dealer.

NOTICE:

If there is an exces-

[ECM01900]

1. Gear oil drain screw

2. Oil level plug

IP:

If a magnetic gear oil drain screw is

●

equipped, remove all metal particles from the screw before installing it. Always use new gaskets. Do not reuse the

●

removed gaskets.

4. Remove the oil level plug and gasket to allow the oil to drain completely.

NOTICE:

Inspect the used oil after it has been drained. If the oil is milky, water is getting into the gear case which can cause gear damage. Consult a Yamaha dealer for repair of the lower unit seals.

[ECM00711]

IP:

For disposal of used oil, consult your Yamaha dealer.

5. Put the outboard motor in a vertical position. Using a flexible or pressurized filling device, inject the gear oil into the gear oil drain screw hole.

Page 91

Recommended gear oil:

Hypoid gear oil SAE#90

Gear oil quantity:

F25A 0.320 L (0.338 US qt, 0.282 Imp.qt) F25EA 0.320 L (0.338 US qt, 0.282 Imp.qt) F25EHA 0.320 L (0.338 US qt, 0.282 Imp.qt) F25MHA 0.320 L (0.338 US qt, 0.282 Imp.qt) T25A 0.430 L (0.455 US qt, 0.378 Imp.qt)

ZMU03274

6. Put a new gasket on the oil level plug. When the oil begins to flow out of the oil level plug hole, insert and tighten the oil level plug.

Tightening torque:

9 Nm (0.9 kgf-m, 6.6 ft-lb)

Maintenance

EMU29302

Cleaning fuel tank

EWM00920

WARNING

Gasoline is highly flammable, and its vapors are flammable and explosive.

●

If you have any question about properly doing this procedure, consult your Yamaha dealer.

●

Keep away from sparks, cigarettes, flames, or other sources of ignition when cleaning the fuel tank.

●

Remove the fuel tank from the boat before cleaning it. Work only outdoors in an area with good ventilation.

●

Wipe up any spilled fuel immediately. Reassemble the fuel tank carefully. Im-

●

proper assembly can result in a fuel leak, which could result in a fire or explosion hazard.

●

Dispose of old gasoline according to local regulations.

1. Empty the fuel tank into an approved container.

2. Pour a small amount of suitable solvent into the tank. Install the cap and shake the tank. Drain the solvent completely.

3. Remove the screws holding the fuel joint assembly. Pull the assembly out of the tank.

7. Put a new gasket on the gear oil drain screw. Insert and tighten the gear oil drain screw.

Tightening torque:

9 Nm (0.9 kgf-m, 6.6 ft-lb)

ZMU02324

4. Clean the filter (located on the end of the

Page 92

Maintenance

suction pipe) in a suitable cleaning solvent. Allow the filter to dry.

5. Replace the gasket with a new one. Reinstall the fuel joint assembly and tighten the screws firmly.

EMU29312

Inspecting and replacing anode(s)

Yamaha outboard motors are protected from corrosion by sacrificial anodes. Inspect the external anodes periodically. Remove scales from the surfaces of the anodes. Consult a Yamaha dealer for replacement of external anodes.

ECM00720

NOTICE

Do not paint anodes, as this would render them ineffective.

IP:

Inspect ground leads attached to external anodes on equipped models. Consult a Yamaha dealer for inspection and replacement of internal anodes attached to the power unit.

ZMU03664

ZMU02924

ZMU05024

EMU29322

ZMU06559

Checking battery (for electric start models)

EWM01900

WARNING

Battery electrolytic fluid is poisonous and caustic, and batteries generate explosive hydrogen gas. When working near the battery:

●

Wear protective eye gear and rubber

Page 93

Maintenance

gloves.

●

Do not smoke or bring any other source

of ignition near the battery. Refer to page 16 for detailed safety information about batteries.

The procedure for checking the battery varies for different batteries. This procedure contains typical checks that apply to many batteries, but you should always refer to the battery manufacturer’s instructions.

ECM01920

NOTICE

A poorly maintained battery will quickly deteriorate.

1. Check the electrolyte level.

EMU29333

Connecting the battery

EWM00570

WARNING

Mount the battery holder securely in a dry, well-ventilated, vibration-free location in the boat. Install a fully charged battery in the holder.

ECM01123

NOTICE

Reversal of the battery cables will damage the electrical parts.

1. Make sure the main switch (on applicable models) is “” (off) before working on the battery.

2. Connect the red battery cable to the POSITIVE (+) terminal first. Then connect the black battery cable to the NEGATIVE (-) terminal.

2. Check the battery’s charge. If your boat is equipped with the digital speedometer, the voltmeter and low battery alert functions will help you monitor the battery’s charge. If the battery needs charging, consult your Yamaha dealer.

3. Check the battery connections. They should be clean, secure, and covered by an insulating cover.

WARNING! Bad connections can produce shorting or arcing and cause an explosion.

[EWM01910]

1. Red cable

2. Black cable

3. Battery

3. The electrical contacts of the battery and cables must be clean and properly connected, or the battery will not start the engine.

EMU29371

Disconnecting the battery

1. Turn off the battery cut-off switch (if equipped) and main switch.

NOTICE:

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Maintenance

they are left on, the electrical system can be damaged.

2. Disconnect the negative cable(s) from the negative (-) terminal.

ways disconnect all negative (-) cables first to avoid a short circuit and damage to the electrical system.

[ECM01940]

3. Disconnect the positive cable(s) and remove the battery from the boat.

4. Clean, maintain, and store the battery according to the manufacturer’s instructions.

[ECM01930]

NOTICE:

Al-

Page 95

Trouble Recovery

EMU29427

Troubleshooting

A problem in the fuel, compression, or ignition systems can cause poor starting, loss of power, or other problems. This section describes basic checks and possible remedies, and covers all Yamaha outboard motors. Therefore some items may not apply to your model. If your outboard motor requires repair, bring it to your Yamaha dealer. If the engine trouble-alert indicator is flashing, consult your Yamaha dealer.

Starter will not operate.

Q. Is battery capacity weak or low? A. Check battery condition. Use battery of recommended capacity.

Q. Are battery connections loose or corroded? A. Tighten battery cables and clean battery terminals.

Q. Is fuse for electric start relay or electric circuit blown? A. Check for cause of electric overload and repair. Replace fuse with one of correct amperage.

Q. Are starter components faulty? A. Have serviced by a Yamaha dealer.

Q. Is shift lever in gear? A. Shift to neutral.

Engine will not start (starter operates).

Q. Is fuel tank empty? A. Fill tank with clean, fresh fuel.

Q. Is fuel contaminated or stale?

A. Fill tank with clean, fresh fuel.

Q. Is fuel filter clogged? A. Clean or replace filter.

Q. Is starting procedure incorrect? A. See page 49.

Q. Has fuel pump malfunctioned? A. Have serviced by a Yamaha dealer.

Q. Are spark plug(s) fouled or of incorrect type? A. Inspect spark plug(s). Clean or replace with recommended type.

Q. Are spark plug cap(s) fitted incorrectly? A. Check and re-fit cap(s).

Q. Is ignition wiring damaged or poorly connected? A. Check wires for wear or breaks. Tighten all loose connections. Replace worn or broken wires.

Q. Are ignition parts faulty? A. Have serviced by a Yamaha dealer.

Q. Is engine shut-off cord (lanyard) not attached? A. Attach cord.

Q. Are engine inner parts damaged? A. Have serviced by a Yamaha dealer.

Engine idles irregularly or stalls.

Q. Are spark plug(s) fouled or of incorrect type? A. Inspect spark plug(s). Clean or replace with recommended type.

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Trouble Recovery

Q. Is fuel system obstructed? A. Check for pinched or kinked fuel line or other obstructions in fuel system.

Q. Is fuel contaminated or stale? A. Fill tank with clean, fresh fuel.

Q. Is fuel filter clogged? A. Clean or replace filter.

Q. Have ignition parts failed? A. Have serviced by a Yamaha dealer.

Q. Has alert system activated? A. Find and correct cause of alert.

Q. Is spark plug gap incorrect? A. Inspect and adjust as specified.

Q. Is ignition wiring damaged or poorly connected? A. Check wires for wear or breaks. Tighten all loose connections. Replace worn or broken wires.

Q. Is specified engine oil not being used? A. Check and replace oil as specified.

A. Return to home position.

Q. Is motor angle too high? A. Return to normal operating position.

Q. Is carburetor clogged? A. Have serviced by a Yamaha dealer.

Q. Is fuel joint connection incorrect? A. Connect correctly.

Q. Is throttle valve adjustment incorrect? A. Have serviced by a Yamaha dealer.

Q. Is battery cable disconnected? A. Connect securely.

Alert buzzer sounds or indicator lights.

Q. Is cooling system clogged? A. Check water intake for restriction.

Q. Is engine oil level low? A. Fill oil tank with specified engine oil.

Q. Is heat range of spark plug incorrect? A. Inspect spark plug and replace it with recommended type.

Q. Is thermostat faulty or clogged? A. Have serviced by a Yamaha dealer.

Q. Are carburetor adjustments incorrect? A. Have serviced by a Yamaha dealer.

Q. Is fuel pump damaged? A. Have serviced by a Yamaha dealer.

Q. Is air vent screw on fuel tank closed? A. Open air vent screw.

Q. Is choke knob pulled out?

Q. Is specified engine oil not being used? A. Check and replace oil with specified type.

Q. Is engine oil contaminated or deteriorated? A. Replace oil with fresh, specified type.

Q. Is oil filter clogged? A. Have serviced by a Yamaha dealer.

Q. Has oil feed/injection pump malfunctioned? A. Have serviced by a Yamaha dealer.

Page 97

Q. Is load on boat improperly distributed? A. Distribute load to place boat on an even plane.

Q. Is water pump or thermostat faulty? A. Have serviced by a Yamaha dealer.

Trouble Recovery

on gear housing? A. Remove foreign matter and clean lower unit.

Q. Is fuel system obstructed? A. Check for pinched or kinked fuel line or other obstructions in fuel system.

Q. Is there excess water in fuel filter cup? A. Drain filter cup.

Engine power loss.

Q. Is propeller damaged? A. Have propeller repaired or replaced.

Q. Is propeller pitch or diameter incorrect? A. Install correct propeller to operate outboard at its recommended speed (r/min) range.

Q. Is trim angle incorrect? A. Adjust trim angle to achieve most efficient operation.

Q. Is motor mounted at incorrect height on transom? A. Have motor adjusted to proper transom height.

Q. Has alert system activated? A. Find and correct cause of alert.

Q. Is boat bottom fouled with marine growth? A. Clean boat bottom.

Q. Is fuel filter clogged? A. Clean or replace filter.

Q. Is fuel contaminated or stale? A. Fill tank with clean, fresh fuel.

Q. Is spark plug gap incorrect? A. Inspect and adjust as specified.

Q. Is ignition wiring damaged or poorly connected? A. Check wires for wear or breaks. Tighten all loose connections. Replace worn or broken wires.

Q. Have electrical parts failed? A. Have serviced by a Yamaha dealer.

Q. Is specified fuel not being used? A. Replace fuel with specified type.

Q. Is specified engine oil not being used? A. Check and replace oil with specified type.

Q. Is thermostat faulty or clogged? A. Have serviced by a Yamaha dealer.

Q. Are spark plug(s) fouled or of incorrect type? A. Inspect spark plug(s). Clean or replace with recommended type.

Q. Are weeds or other foreign matter tangled

Q. Is air vent screw closed? A. Open the air vent screw.

Q. Is fuel pump damaged? A. Have serviced by a Yamaha dealer.

Page 98

Trouble Recovery

Q. Is fuel joint connection incorrect? A. Connect correctly.

Q. Is heat range of spark plug incorrect? A. Inspect spark plug and replace it with recommended type.

Q. Is high pressure fuel pump drive belt broken? A. Have serviced by a Yamaha dealer.

Q. Is engine not responding properly to shift lever position? A. Have serviced by a Yamaha dealer.

Engine vibrates excessively.

Q. Is propeller damaged? A. Have propeller repaired or replaced.

Q. Is propeller shaft damaged? A. Have serviced by a Yamaha dealer.

Q. Are weeds or other foreign matter tangled on propeller? A. Remove and clean propeller.

Q. Is motor mounting bolt loose? A. Tighten bolt.

Q. Is steering pivot loose or damaged? A. Tighten or have serviced by a Yamaha dealer.

EMU29433

Temporary action in

emergency

EMU29440

Impact damage

EWM00870

WARNING

The outboard motor can be seriously damaged by a collision while operating or

trailering. Damage could make the outboard motor unsafe to operate.

If the outboard motor hits an object in the water, follow the procedure below.

1. Stop the engine immediately.

2. Inspect the control system and all components for damage. Also inspect the boat for damage.

3. Whether damage is found or not, return to the nearest harbor slowly and carefully.

4. Have a Yamaha dealer inspect the outboard motor before operating it again.

EMU30681

Replacing fuse

If a fuse has blown, open the fuse holder and remove the fuse with a fuse puller. Replace it with a spare one of the proper amperage.

EWM00631

WARNING

Substituting an incorrect fuse or a piece of wire could allow excessive current flow. This could cause electric system damage and a fire hazard.

Consult your Yamaha dealer if the new fuse immediately blows again.

Page 99

Trouble Recovery

1. Fuse puller

2. Cap

3. Fuse (20 A, 30 A)

4. Spare fuse (20 A, 30 A)

ZMU06565

ZMU03562

1. Fuse puller

2. Fuse (20 A, 30 A)

EMU29512

Power trim and tilt will not operate

If the engine cannot be tilted up or down with the power trim and tilt because of a discharged battery or a failure with the power trim and tilt unit , the engine can be tilted manually.

1. Loosen the manual valve screw by turning it clockwise until it stops.

ZMU02816

1. Manual valve screw

2. Put the engine in the desired position, then tighten the manual valve screw by turning it counterclockwise.

EMU29533

Starter will not operate

If the starter mechanism does not operate (the engine cannot be cranked with the starter), the engine can be started with an emergency starter rope.

EWM01022

WARNING

●

Use this procedure only in an emergency to return to the nearest port for repairs.

●

When the emergency starter rope is used to start the engine, the start-ingear protection device does not operate. Make sure the remote control lever is in neutral. Otherwise the boat could unexpectedly start to move, which could result in an accident. Attach the engine shut-off cord to a se-

●

cure place on your clothing, or your arm or leg while operating the boat. Do not attach the cord to clothing that

●

could tear loose. Do not route the cord where it could become entangled, preventing it from functioning. Avoid accidentally pulling the cord dur-

●

Page 100

Trouble Recovery

●

Make sure no one is standing behind you when pulling the starter rope. It could whip behind you and injure someone.

●

An unguarded, rotating flywheel is very dangerous. Keep loose clothing and other objects away when starting the engine. Use the emergency starter rope only as instructed. Do not touch the flywheel or other moving parts when the engine is running. Do not install the starter mechanism or top cowling after the engine is running.

●

Do not touch the ignition coil, spark plug wire, spark plug cap, or other electrical components when starting or operating the motor. You could get an electrical shock.

EMU38840

Emergency starting engine (manual start model)

1. Remove the top cowling and protective cover.

the manual starter.

ZMU06577

ZMU6576

3. Remove the manual starter after removing the bolt(s).

ZMU06574

2. Remove the grommet and disconnect the start-in-gear protection cable from

ZMU06575

Yamaha F25, T25 user guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Safety information

General information

Specifications and requirements

Components

Instruments and indicators

Engine control system

Installation

Operation

Maintenance

Trouble Recovery