Yamaha 30D User Manual

OWNER’S MANUAL

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Read this manual carefully before operating this

outboard motor.

30D

6J8-28199-74-E0

EMU25052

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.

Important manual information

T

T

EMU25105

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.
To ensure long product life, Yamaha recom­mends that you use the product and perform
the specified periodic inspections and main­tenance by correctly following the instruc­tions in the owner’s manual. Any damage
resulting from neglect of these instructions is
not covered by warranty.
Some countries have laws or regulations re­stricting users from taking the product out of
the country where it was purchased, and it
may be impossible to register the product in
the destination country. Additionally, the
warranty may not apply in certain regions.
When planning to take the product to another
country, consult the dealer where the prod­uct was purchased for further information.
If the product was purchased used, please
consult your closest dealer for customer re­registration, and to be eligible for the speci­fied services.

IP:

The 30DEO, 30DETO, 30DMHO 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.

EMU25121

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

30D

OWNER’S MANUAL

©2008 by Yamaha Motor Co., Ltd.

1st Edition, April 2008

All rights reserved.

Any reprinting or unauthorized use

without the written permission of

Yamaha Motor Co., Ltd.
is expressly prohibited.

Printed in Japan

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

Passenger training ............................ 3

Boating safety publications ...............3

Laws and regulations ........................ 3

General information ..........................4

Identification numbers record.......... 4

Outboard motor serial number .......... 4

Key number....................................... 4

EC Declaration of Conformity

(DoC) ............................................. 4

CE Marking ..................................... 4

Read manuals and labels................ 6

Warning labels ..................................6

Specifications and requirements... 10

Specifications ................................ 10

Installation requirements ............... 11

Boat horsepower rating................... 11

Mounting motor ............................... 11

Remote control requirements........ 11

Battery requirements..................... 12

Battery specifications ...................... 12

Mounting battery .............................12

Multiple batteries............................. 12

Without a rectifier or Rectifier

Regulator ...................................... 12

Propeller selection......................... 12

Start-in-gear protection ................. 13

Engine oil requirements ................ 13

Fuel requirements......................... 13

Gasoline .......................................... 13

Muddy or acidic water................... 13

Anti-fouling paint ........................... 14

Motor disposal requirements......... 14

Emergency equipment.................. 14

Components .................................... 15

Components diagram.................... 15

Fuel tank .........................................15

Fuel joint.......................................... 16

Fuel gauge ......................................16

Fuel tank cap................................... 16

Air vent screw.................................. 16

Remote control box ......................... 16

Remote control lever ....................... 16

Neutral interlock trigger ................... 17

Neutral throttle lever........................ 17

Choke switch................................... 17

Tiller handle..................................... 17

Gear shift lever................................ 18

Throttle grip ..................................... 18

Throttle indicator .............................18

Throttle friction adjuster................... 18

Engine shut-off cord (lanyard) and

clip................................................. 19

Engine stop button ..........................19

Choke knob for pull type .................20

Manual starter handle .....................20

Main switch .....................................20

Steering friction adjuster .................20

Power trim and tilt switch on remote

control ...........................................21

Trim tab with anode......................... 21

Trim rod (tilt pin) .............................. 22

Shallow water lever ......................... 22

Tilt lock mechanism......................... 22

Tilt support knob.............................. 22

Tilt support lever for manual tilt

model ............................................23

Top cowling lock lever(s)

(turn type)...................................... 23

2-pin connector ...............................23

Battery charging information ...........24

Table of contents

Alert indicator .................................. 24

Engine control system.................... 25

Alert system .................................. 25

Overheat alert .................................25

Oil level alert and oil filter clogging

alert............................................... 25

Installation .......................................27

Installation ..................................... 27

Mounting the outboard motor.......... 27

Clamping the outboard motor ......... 28

Operation .........................................30

First-time operation ....................... 30

Breaking in engine ..........................30

Getting to know your boat ............... 30

Checks before starting engine ...... 30

Fuel level......................................... 31

Remove cowling.............................. 31

Fuel system..................................... 31

Controls........................................... 31

Engine shut-off cord (lanyard)......... 32

Oil.................................................... 32

Engine............................................. 32

Operation after long period of

storage.......................................... 32

Install cowling.................................. 33

Power trim and tilt system............... 33

Battery............................................. 34

Filling fuel and engine oil............... 34

Filling fuel for portable tank............. 34

Filling oil for manual starter

model ............................................ 35

Filling oil for electric start models.... 35

Oil level indicator operation............. 37

Operating engine........................... 37

Feeding fuel (portable tank) ............ 37

Starting engine................................ 38

Checks after starting engine ......... 42

Cooling water .................................. 42

Warming up engine ....................... 42

Choke start models ......................... 42

Checks after engine warm-up ....... 42

Shifting ............................................ 42

Stop switches.................................. 42

Shifting .......................................... 42

Stopping boat................................ 44

Stopping engine............................ 44

Procedure........................................ 44

Trimming outboard motor.............. 45

Adjusting trim angle for manual tilt

models ..........................................46

Adjusting trim angle (power tilt

models) .........................................46

Adjusting boat trim ..........................47

Tilting up and down....................... 48

Procedure for tilting up (manual tilt

models) .........................................48

Procedure for tilting up (power trim

and tilt models).............................. 49

Procedure for tilting down (manual

tilt models)..................................... 50

Procedure for tilting down (power

trim and tilt models)....................... 50

Shallow water................................ 51

Cruising in shallow water (manual

tilt models)..................................... 51

Power trim and tilt models............... 52

Cruising in other conditions........... 53

Maintenance .................................... 54

Transporting and storing outboard

motor ........................................... 54

Clamp screw mounting models ....... 54

Storing outboard motor ...................54

Procedure........................................ 55

Lubrication (oil injection models)..... 57

Cleaning the outboard motor........... 57

Checking painted surface of

motor.............................................57

Periodic maintenance ................... 57

Replacement parts .......................... 58

Severe operating conditions............ 58

Maintenance chart 1........................ 59

Maintenance chart 2........................ 61

Greasing.......................................... 62

Cleaning and adjusting spark

plug ...............................................63

Checking fuel filter........................... 64

Inspecting idling speed.................... 64

Checking water in engine oil tank ...65

Checking wiring and connectors .....65

Table of contents

Checking propeller .......................... 65

Removing propeller......................... 66

Installing propeller........................... 66

Changing gear oil............................ 67

Cleaning fuel tank ...........................68

Inspecting and replacing

anode(s)........................................ 69

Checking battery (for electric start

models) ......................................... 69

Connecting the battery.................... 70

Disconnecting the battery ............... 70

Trouble Recovery............................ 72

Troubleshooting ............................ 72

Temporary action in emergency.... 75

Impact damage ...............................75

Replacing fuse ................................75

Power trim and tilt will not

operate.......................................... 76

Starter will not operate .................... 76

Emergency starting engine .............77

Treatment of submerged motor..... 78

Safety information

EMU33622

Outboard motor safety

Observe these precautions at all times.

EMU36500

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.

●

Shut off 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 37 to
reduce the risk of fire and explosion.

Always, refuel ac-

1

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.

EMU33730

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 shut off the motor.
Stay away from swimming areas. Swimmers
can be hard to see.
The propeller can keep moving even when
the motor is in neutral. Shut off the engine
when a person is in the water near you.

EMU33750

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-

2

Safety information

dling and lead to an accident, capsizing or
swamping.

EMU33771

Avoid collisions

Scan constantly

other boats. Be alert for conditions that limit
your visibility or block your vision of others.

Operate defensively

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

member,
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

for people, objects, and

ZMU06025

at safe speeds and

to avoid collisions. Re-

boats do not have brakes

, and

Weather

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

boating in hazardous weather.

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.

EMU33600

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.

3

General information

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.

1. Outboard motor serial number location

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.

1. Key number

EMU37290

EC Declaration of Conformity

(DoC)

This outboard motor conforms to certain por­tions of the European Parliament directive
relating to machinery.
Each conformed outboard motor accompa­nied with EC DoC.EC DoC contains the fol­lowing information;

Name of Engine Manufacture

●

●

Model name
Product code of model (Approved model

●

code)

●

Code of conformed directives

EMU25203

CE Marking

Outboard motors affixed with this “CE”mark­ing conform with the directives of; 98/37/EC,
94/25/EC - 2003/44/EC and 2004/108/EC.

4

General information

1

1. CE marking location

ZMU06200

ZMU06040

5

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.

30DMHO

2

1

3

ZMU06197

6

30DEO, 30DETO

General information

1

3

2

ZMU06202

7

General information

1

EMU33912

Contents of labels

The above warning labels mean as follows.

1

EWM01691

WARNING

Emergency starting does not have start­in-gear protection. Ensure shift control is
in neutral before starting engine.

2

EWM01681

WARNING

●

Keep hands, hair, and clothing away
from rotating parts while the engine is
running.

●

Do not touch or remove electrical parts
when starting or during operation.

2

3

ZMU05706

3

EWM01671

WARNING

●

Read Owner’s Manuals and labels.

●

Wear an approved personal flotation
device (PFD).

●

Attach engine shut-off cord (lanyard) to
your PFD, arm, or leg so the engine
stops if you accidentally leave the
helm, which could prevent a runaway
boat.

8

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

9

Specifications and requirements

T

EMU31480

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.

EMU2821C

Dimension:

Overall length:

30DEO 662 mm (26.1 in)

30DETO 662 mm (26.1 in)

30DMHO 993 mm (39.1 in)

Overall width:

30DEO 307 mm (12.1 in)

30DETO 307 mm (12.1 in)

30DMHO 360 mm (14.2 in)

Overall height S:

30DEO 1140 mm (44.9 in)

30DMHO 1158 mm (45.6 in)

Overall height L:

30DEO 1261 mm (49.6 in)

30DETO 1261 mm (49.6 in)

30DMHO 1279 mm (50.4 in)

Transom height S:

30DEO 424 mm (16.7 in)

30DMHO 424 mm (16.7 in)

Transom height L:

545 mm (21.5 in)

Weight (AL) S:

30DEO 60.0 kg (132 lb)

30DMHO 60.0 kg (132 lb)

Weight (AL) L:

30DEO 62.0 kg (137 lb)

30DETO 66.0 kg (146 lb)

30DMHO 62.0 kg (137 lb)

Performance:

Full throttle operating range:

4500–5500 r/min

Maximum output:

22.1 kW@5000 r/min
(30 HP@5000 r/min)

Idling speed (in neutral):

30DEO 750 ±50 r/min
30DETO 1050 ±50 r/min
30DMHO 750 ±50 r/min

Engine:

Type:

2-stroke L

Displacement:

496.0 cm

Bore × stroke:

59.5 × 59.5 mm (2.34 × 2.34 in)

Ignition system:

CDI

Spark plug with resistor (NGK):

BR7HS-10

Spark plug gap:

0.9–1.0 mm (0.035–0.039 in)

Control system:

30DEO Remote control
30DETO Remote control
30DMHO Tiller

Starting system:

30DEO Electric
30DETO Electric
30DMHO Manual

Starting carburetion system:

Choke valve

Min. cold cranking amps (CCA/EN):

30DEO 347.0 A
30DETO 347.0 A

Min. rated capacity (20HR/IEC):

30DEO 40.0 Ah
30DETO 40.0 Ah

Alternator output:

30DMHO 80 W

Maximum generator output:

30DEO 6.0 A

3

10

Specifications and requirements

30DETO 6.0 A

Drive unit:

Gear positions:

Forward-neutral-reverse

Gear ratio:

1.85 (24/13)

Trim and tilt system:

30DEO Manual tilt

30DETO Power trim and tilt

30DMHO Manual tilt

Propeller mark:

F

Fuel and oil:

Recommended fuel:

Regular unleaded gasoline

Min. research octane:

90

Fuel tank capacity:

25 L (6.60 US gal, 5.50 Imp.gal)

Recommended engine oil:

YAMALUBE 2-stroke outboard motor

oil

Lubrication:

Oil injection

Engine oil tank capacity:

0.9 L (0.95 US qt, 0.79 Imp.qt)

Recommended gear oil:

Hypoid gear oil SAE#90

Gear oil quantity:

0.200 L (0.211 US qt, 0.176 Imp.qt)

Tightening torque for engine:

Spark plug:

25.0 Nm (2.55 kgf-m, 18.4 ft-lb)

Propeller nut:

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

Noise and vibration level:

Operator sound pressure level (ICOMIA
39/94 and 40/94):

91.7 dB(A)
Sound power level (ICOMIA 39/94 and
40/94):

98.7 dB(A)

Vibration on tiller handle (ICOMIA 38/94):

Vibration on tiller handle is under 2.5

2

m/s

EMU33553

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, spe­cial 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

27.

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

11

Specifications and requirements

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

EMU25721

Battery specifications

Minimum cold cranking amps (CCA/EN):

30DEO 347.0 A
30DETO 347.0 A

Minimum rated capacity (20HR/IEC):

30DEO 40.0 Ah
30DETO 40.0 Ah

The engine cannot be started if battery volt­age is too low.

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.

EMU34191

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 propel-

12

Specifications and requirements

ler 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 65.

x

-

123

ZMU04605

1. Propeller diameter in inches

2. Propeller pitch in inches

3. Type of propeller (propeller mark)

proved 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.

EMU25651

Engine oil requirements

Recommended engine oil:

YAMALUBE 2-stroke outboard motor
oil

If the recommended engine oil is not avail­able, another 2-stroke engine oil with an
NMMA-certified TC-W3 rating may be used.

EMU36360

Fuel requirements

EMU36801

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.

Recommended gasoline:

Regular unleaded gasoline with a min­imum octane rating of 90 (Research
Octane Number).

x

-

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-ap-

ECM01980

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
has been stored in clean containers.

EMU36880

Muddy or acidic water

Yamaha strongly recommends that you have

13

Specifications and requirements

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.

●

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

Consult your Yamaha dealer for details.

EMU36340

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, pli-

●

ers, wrenches (including metric sizes), and
electrical tape.
Waterproof flashlight with extra batteries.

●

●

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

14

Components

T

EMU2579H

Components diagram

IP:

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

30DEO, 30DMHO, 30DETO

1

2

3

8

19

7

4
5

6

1. Oil tank filler cap

2. Top cowling

3. Top cowling lock lever(s)

4. Anti-cavitation plate

5. Trim tab (anode)

6. Propeller

7. Cooling water inlet

8. Tilt rod*

9. Manual starter handle*

10. Engine stop button/Engine shut-off switch*

11. Alert indicator*

12. Gear shift lever*

13. Throttle grip*

14. Tilt lock lever*

15. Transom clamp handle*

9

10

22

18

11

12

14
15

17

20

16. Shallow water lever*

17. Rope attachment

18. Choke knob

19. Tilt support knob*

20. Remote control box (side mount type)*

21. Fuel tank

22. Clip*

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

21

16

13

ZMU03758

15

Components

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.

13

1. Fuel joint

2. Fuel gauge

3. Fuel tank cap

4. Air vent screw

EMU25830

42

ZMU03157

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 switch-

es 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 / choke 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 “ ”

16

T

4. Shift

5. Fully closed

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.

Components

1. Fully open

2. Fully closed

EMU26221

Choke switch

To activate the choke system, press in the
main switch while the key is turned to the
“” (on) or “ ” (start) position. The
choke system will then supply the rich fuel
mixture required to start the engine. When
the key is released, the choke will switch off
automatically.

EMU25911

Tiller handle

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

17

Components

ZMU02846

EMU25922

Gear shift lever

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

R

3

N

2

F
1

ZMU03687

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.

ZMU02848

EMU25961

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

ZMU02849

1. Throttle indicator

EMU25973

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.

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.

WARNING! Do not overtighten

[EWM00032]

18

Components

To decrease resistance, turn the adjuster
counterclockwise.

ZMU03688

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 en-

WARNING! At-

tangled, 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.

1. Cord

2. Clip

3. Engine shut-off switch

[EWM00122]

2

1

3

ZMU03759

1. Clip

2. Cord

3. Engine shut-off switch

EMU26001

Engine stop button

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

19

Components

ZMU03760

EMU26011

Choke knob for pull type

To supply the engine with the rich fuel mix­ture required to start, pull out this knob.

EMU26090

Main switch

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

●

“”

(off)

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

●

“”

(on)

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

“”

●

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

(start)

ZMU03761

EMU26070

Manual starter handle

To start the engine, first gently pull the han­dle out until resistance is felt. From that posi­tion, then pull the handle straight out quickly
to crank the engine.

20

EMU26122

Steering friction adjuster

A friction device provides adjustable resis­tance to the steering mechanism, and can be
set according to operator preference. An ad­justing screw or bolt is located on the swivel
bracket.

ZMU02908

To increase resistance, turn the adjuster
clockwise.
To decrease resistance, turn the adjuster
counterclockwise.

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.

EMU32052

Power trim and tilt switch on remote
control

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 45 and 48.

Components

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
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.

21

Components

A

1

2

B

ZMU03097

ZMU03763

1. Trim tab

2. Bolt

Bolt tightening torque:

18.0 Nm (1.8 kgf-m, 13 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.

ZMU03762

EMU26280

Shallow water lever

Pushing this lever down will tilt the motor up
partially to provide more clearance when op­erating in shallow water.

EMU30530

Tilt lock mechanism

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

1

1. Tilt lock lever

ZMU03764

To lock it, set the tilt lock lever in the lock po­sition. To release, push the tilt lock lever in
the release position.

EMU26321

Tilt support knob

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

22

ZMU03765

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.

EMU26351

Tilt support lever for manual tilt
model

To keep the outboard motor in the tilted up
position, lock the tilt support lever to the
swivel bracket.

Components

ered in the normal running position, use
an additional support device to secure it
in the tilt position.

EMU26372

Top cowling lock lever(s) (turn type)

To remove the engine top cowling, turn the
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 lever(s) to the
lock position.

1

1. Top cowling lock lever(s)

EMU26410

2-pin connector

AC 12 V-40/60/80W power is delivered
through this connector. When using it, keep
in mind the following points:

ZMU03701

ZMU03766

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 trail-

ZMU03767

Use a genuine Yamaha connector.

●

●

Use lighting equipment only.
Connect lighting equipment directly to the

●

23

Components

T

2-pin connector.

●

Capacity of the lighting equipment must be
more than 12 V-40/60/80W; otherwise the
bulb could burn out.

●

When the connector is not in use, place
the cap on it.

ECM01000

NOTICE

Do not connect the 2-pin connector di­rectly to the battery terminals. Otherwise
the electric system will be damaged.

EMU26420

Battery charging information

If you need to charge the battery, use a gen­uine charge cable to make the charging cir­cuit.
For details on the cable connections, consult
your Yamaha dealer.

IP:

Do not use the 2-pin connector while

●

charging. The battery will not be charged.
If you need to use lighting equipment while

●

charging the battery, connect it to the bat­tery, not to the 2-pin connector.

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 25.

ZMU03768

24

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.

ZMU03769

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

EMU26848

Oil level alert and oil filter clogging
alert

Oil injection models

This engine has an oil level alert system. If
the oil level falls below the lower limit, the
alert system will activate.

Activation of alert device

●

Engine speed will automatically decrease
to about 2000 r/min.

●

The oil level-alert indicator will light or
blink.

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-

ZMU03769

●

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

25

Engine control system

T

ZMU03025

If the alert system has been activated, stop
the engine and check for the cause.

IP:

The alert for oil filter clogging is similar to the
alerts for low oil level and overheating. To
make troubleshooting easier, check for en­gine overheating first, then oil level, and fi­nally oil filter clogging.

1

ZMU03707

1. Oil filter

26

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

1. Center line (keel line)

EMU26921

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

27

Installation

T

0–25mm
(0–1in.)

ECM01630

NOTICE

During water testing, check the buoy-

●

ancy of the boat, at rest, with its maxi­mum load. Check that the static water
level on the exhaust housing is low
enough to prevent water entry into the
power head when water rises due to
waves when the outboard is not run­ning.
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 man-

ZMU02011

ufacturer for further information on deter­mining the proper mounting height.
For instructions on setting the trim angle of

●

the outboard motor, see page 45.

EMU26971

Clamping the outboard motor

1. Place the outboard motor on the tran­som 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 engine restraint cable attachment
is equipped on your engine, an engine
restraint cable or chain should be used.
Attach one end to the engine 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

28

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

1. Bolts

ZMU03806

29

Operation

EMU36380

First-time operation

EMU27020

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.

ECM00140

NOTICE

Failure to follow the break-in procedure

●

could result in reduced engine life or
even severe engine damage.
Premix fuel must be used during break-

●

in in addition to oil in the oil injection
system.

EMU27060

Gasoline and engine oil mixing chart
(50:1)

1. : Gasoline

2. : Engine oil

ECM00150

NOTICE

Be sure to mix gasoline and oil complete­ly, otherwise the engine may be dam­aged.

EMU30311

Procedure for oil injection models

Run the engine under load (in gear with a
propeller installed) for 10 hours as follows.

1. First 10 minutes:

Run the engine at the lowest possible
speed. A fast idle in neutral is best.

2. Next 50 minutes:
Do not exceed half throttle (approxi­mately 3000 r/min). Vary engine speed
occasionally. If you have an easy-plan­ing boat, accelerate at full throttle onto
plane, then immediately reduce the
throttle to 3000 r/min or less.

3. Next two hours:
Accelerate at full throttle onto plane,
then reduce engine speed to three-quar­ter throttle (approximately 4000 r/min).
Vary engine speed occasionally. Run at
full throttle for one minute, then allow
about 10 minutes of operation at three­quarter throttle or less to let the engine
cool.

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

5. After the first 10 hours:
Operate the engine normally. Use only
straight gasoline in the fuel tank. The
Yamaha oil injection system provides
proper lubrication for normal operation.

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 45).

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 acci-

30

Operation

dent could occur.

ECM00120

NOTICE

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

EMU37141

Fuel level

Be sure you have plenty of fuel for your trip.
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 34.

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.

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.

EMU36450

Check for fuel leaks

Check under top cowling and in the boat

●

for fuel leaks or gasoline fumes.
Check fuel line connections to be sure they

●

are tight.

●

Check fuel lines for cracks, swelling, or
other damage.

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.

ZMU06092

EMU36440

Fuel system

EWM00060

WARNING

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

ZMU06201

EMU36900

Controls

Tiller handle models:

Turn the tiller handle fully to the left and

●

right to make sure operation is smooth.

●

Turn the throttle grip from the fully closed

31

Operation

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 and shift cables under the en­gine cowling.

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

●

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 under the en­gine cowling.

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

2

1

3

ZMU03759

1. Clip

2. Cord

3. Engine shut-off switch

EMU27120

Oil

Check to be sure you have plenty of oil for

●

your trip.

EMU27151

Engine

Check the engine and engine mounting.

●

●

Look for loose or damaged fasteners.
Check the propeller for damage.

●

Check for oil leaks.

●

EMU27180

Operation after long period of
storage

Oil injection models

When operating the engine after a long peri­od (12 months) of storage, proceed as fol­lows:

1. Use a 50:1 gasoline to oil mixture to start
the engine.

2. Start the engine. Leave it idling.

EWM01330

WARNING

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.

32

3. Watch for oil flowing through the oil feed

pipes. After any air in the oil lines has
been expelled, the oil injection system
should supply oil normally. If no oil is
flowing after 10 minutes of idling, consult
your Yamaha dealer.

ZMU03770

ECM01260

NOTICE

Be sure to take the above steps when op­erating the engine after a long period of
storage. Otherwise engine seizure could
occur.

EMU36952

Install cowling

1. Be sure that a cowling lock lever is re­leased.

2. Be sure that the rubber seal is seated all
the way around the engine.

3. Place the cowling on top of the seal.

4. Check to be sure the rubber seal fits cor­rectly all the way around the engine.

5. Move the lever to lock the cowling as
shown.

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

NOTICE:

[ECM01990]

If the cowling is not

Operation

ZMU06117

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.

ZMU04678

EMU34581

Power trim and tilt system

EWM01930

WARNING

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.

●

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.

33

Operation

1

ZMU03798

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.

EMU36581

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.

EMU27234

Filling fuel and engine oil

EMU27246

Filling fuel for portable tank

EWM01830

WARNING

●

Gasoline and its vapors are highly flam­mable 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. Stop the engine.

2. Remove the portable tank from the boat.

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

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

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

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

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

Fuel tank capacity:

25 L (6.60 US gal, 5.50 Imp.gal)

34

Operation

2

1

ZMU03012

8. Tighten the filler cap securely.

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

EMU27301

Filling oil for manual starter model

EWM00530

WARNING

Do not add gasoline into the oil tank. Fire
or explosion could result.

This engine uses the Yamaha oil injection
system, which provides superior lubrication
by ensuring the proper oil ratio for all operat­ing conditions. No fuel premixing is needed.
Simply pour gasoline into the fuel tank and
oil into the oil tank. Convenient indicator seg­ments indicate the status of the oil supply.
For details on reading the indicator seg­ments, see page 37.
To fill the engine oil tank, proceed as follows:

Engine oil tank capacity:

0.9 L (0.95 US qt, 0.79 Imp.qt)

ZMU03711

1. Engine oil tank

2. Oil tank filler cap

4. After filling, replace the cap securely.

EMU27311

Filling oil for electric start models

EWM00530

WARNING

Do not add gasoline into the oil tank. Fire
or explosion could result.

This engine uses the Yamaha oil injection
system, which provides superior lubrication
by ensuring the proper oil ratio for all operat­ing conditions. No fuel premixing is needed.
Simply pour gasoline into the fuel tank and
oil into the oil tank. Convenient indicator seg­ments indicate the status of the oil supply.
For details on reading the indicator seg­ments, see page 37.
To fill the engine oil tank, proceed as follows:

Engine oil tank capacity:

0.9 L (0.95 US qt, 0.79 Imp.qt)

1. Remove the top cowling.

2. Open the oil tank filler cap by pulling the
tab.

3. Slowly fill the engine oil into the engine
oil tank.

1. Turn the oil filler access cap on the top
cowling counterclockwise and open it.

35

Operation

1

2

1. Engine oil tank

2. Oil tank filler cap

3. Oil filler access cap

2. Open the oil tank filler cap by pulling the
tab on the cap.

3. Slowly pour the engine oil into the en­gine oil tank.

4. After filling, replace the all caps secure­ly.

3

ZMU03771

36

EMU27321

Oil level indicator operation

The various functions of the oil level system are as follows:

EMU27334

Oil level-alert indicator Engine oil tank Remarks

more than

3

OFF

Red

ON

EMU27451

Operating engine

EMU27464

Feeding 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
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,

200 cm
(0.21 US qt,

0.181 Imp qt)

200 cm3 or
less (0.21
US qt, 0.181
Imp qt)

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.

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.

Operation

No refilling necessary.

Buzzer sounds in

●

remote control box
and engine speed is
limited to about 2000
r/min to help con­serve oil.
Check oil filter for

●

clogging.

●

Add oil; see page

35.

ZMU02022

37

Operation

ZMU03772

ZMU02024

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.

EMU27492

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.

EMU27508

Manual start models (tiller control)

EWM01840

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.

1. Arrow

38

1. Place the gear shift lever in neutral.

N

ZMU02025

ZMU03714

T

IP:

T

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.

ZMU03773

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

Operation

ZMU03774

IP:

●

It is not necessary to use the choke when
starting a warm engine.

●

If the choke knob is left in the “ ”
(start) position while the engine is running,
the engine will run poorly or stall.

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.

4. Pull out / turn the choke knob fully. After
the engine starts, replace / return the
knob to the home position.

ZMU02954

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

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

39

Operation

T

T

ZMU02030

IP:

When the engine is cold, it needs to be

●

warmed up. For further information, see
page 42.
If the engine does not start on the first try,

●

repeat the procedure. If the engine fails to
start after 4 or 5 tries, open the throttle a
small amount (between 1/8 and 1/4) and
try again. Also if the engine is warm and
fails to start, open the throttle a same
amount and try to start the engine again. If
the engine still fails to start, see page 72.

EMU27645

Electric start / remote control models

EWM01840

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.

1. Place the remote control lever in neutral.

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.

3. Turn the main switch to “ ” (on).

40

T

T

OFF

ON

pressed in.

Operation

ON

STARTOFF

ZMU01880

4. Open the throttle slightly without shifting
using the neutral throttle lever or free ac­celerator. You may need to change the
throttle opening slightly depending on
engine temperature. After the engine
starts, return the throttle to the original
position.

N

ZMU02314

IP:

●

On remote controls equipped with a neu­tral throttle lever, a good starting point is to
lift the lever just until you feel resistance,
then lift slightly more.

●

The neutral throttle lever or free accelera­tor can only be used when the remote con­trol lever is in neutral.

5. Press in and hold the main switch to op­erate the remote choke system. The re­mote choke switch automatically returns
to its normal position when you release
your hand. Therefore keep the switch

ZMU02315

IP:

●

It is not necessary to use the choke when
starting a warm engine.
Push in the main switch fully, or the remote

●

choke system will not operate.

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

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

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
starter can also be damaged. If the
engine will not start after 5 seconds

NOTICE:

Never turn

41

Operation

of cranking, return the main switch to
“” (on), wait 10 seconds, then
crank the engine again.

EMU36510

[ECM00192]

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.

ZMU02856

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

EMU27670

Warming up engine

EMU27683

Choke start models

After starting the engine, allow it to idle for 3
minutes to warm up. Failure to do so will
shorten engine life. Gradually return the
choke knob to its home position as the en­gine warms up.

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.

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.

EMU34530

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

42

engine and allow it to warm up.

To shift out of neutral

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

Operation

1. Neutral interlock trigger

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.

ZMU03788

R

N

F

ZMU05678

To shift from in gear (forward/reverse) to
neutral

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

43

Operation

pact 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.

ZMU02030

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.

N

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).

ZMU03724

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 im-

44

ZMU03778

2. After stopping the engine, disconnect

T

the fuel line if there is a fuel joint on the
outboard motor.

ZMU03779

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

Operation

gine 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.

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 en-

ZMU02041

45

Operation

T

1

ZMU02858

1. Trim operating angle

EMU27872

Adjusting trim angle for manual tilt
models

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

1. Stop the engine.

2. Tilt the outboard motor up, and then re­move the trim rod from the clamp brack­et.

1

ZMU03780

1. Trim rod

3. Reposition the rod in the desired hole.
To raise the bow (“trim-out”), move the rod
away from the transom.
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.

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.

IP:

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

EMU27904

Adjusting trim angle (power tilt
models)

EWM00753

WARNING

Be sure all people are clear of the out-

●

46

Operation

T

board 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.

Tilt the engine to the desired angle using the
power tilt switch.

IP:

Stay within the trim operating angle when
trimming the outboard motor using the power
tilt system.
To raise the bow (“trim-out”), tilt the engine
up.
To lower the bow (“trim-in”), tilt the engine
down.
Make test runs with the trim set to different
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
to accelerate from a standing start onto
plane.

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 “por­poise” (hop in the water), which could throw
the operator and passengers overboard.

47

Operation

T

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 44. 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.

EMU27955

Procedure for tilting up (manual tilt
models)

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

N

ZMU03724

2. Place the tilt lock lever in the release po-

48

sition.

ZMU03782

3. Hold the rear of the top cowling with one
hand, tilt the engine up, and turn the tilt
support lever to the lock position and
support the engine.

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. For more detailed informa­tion, see page 54.

EMU32723

[ECM01641]

ZMU03783

Procedure for tilting up (power trim
and tilt models)

1. Place the remote control lever in neutral.

Operation

N

ZMU03196

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

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.

TICE:

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. For more detailed in­formation, see page 54.

[EWM00262]

[ECM01641]

NO-

49

Operation

ZMU03785

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

EMU34470

DN

UP

DN

[ECM00251]

ZMU01936

Procedure for tilting down (manual
tilt models)

1. Release the tilt lock lever.

ZMU03786

2. Hold the rear of the top cowling with one
hand, tilt the outboard motor up slightly
and pull out the tilt support knob or re­turn the tilt support lever.

ZMU03787

3. Slowly tilt the outboard motor down.

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

50

ZMU03788

EMU33120

Procedure for tilting down (power
trim and tilt models)

1. Push the power trim and tilt switch “ ”

Operation

(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.

ZMU03789

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

UP

DN

DN

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.

ZMU02868

ZMU01936

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

EMU28142

Procedure

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

N

ZMU03790

2. Push the shallow water lever down to
the release position.

51

Operation

ZMU03791

3. To set the outboard motor in a partially
tilted position, slightly tilt the outboard
motor up until the plate turns completely.

ZMU03792

4. To return the outboard motor to the nor­mal running position, place the remote
control lever / gear shift lever in neutral,
then slightly tilt the outboard motor up.
Set the tilt lock lever and shallow water
lever to the lock position and slowly tilt
the outboard motor down.

EMU32851

Power trim and tilt models

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

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 overheat-

ing can result.

EMU32922

Procedure for power trim and tilt models

1. Place the remote control lever in neutral.

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.

UP

[EWM01850]

UP

DN

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.

52

EMU28194

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 and, if possible, rinse the power head un­der the cowling.

Cruising in muddy, turbid, or acidic water

Yamaha strongly recommends that you use
the optional chromium-plated water pump kit
(see page 13) 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.

Operation

53

Maintenance

T

EMU28226

Transporting and storing

outboard motor

EWM00692

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.

ZMU02870

ZMU02869

IP:

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

EMU30272

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.

ECM01411

NOTICE

●

Do not place the outboard motor on its
side before the cooling water has
drained from it completely, otherwise

54

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.

EMU28303

Procedure

EMU28334

Flushing in a test tank

ECM00300

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.
Before starting the engine, be sure to
supply water to the cooling water passag­es.

1. Wash the outboard motor body using
fresh water.

ter into the air intake.

ther information, see page 57.

2. Disconnect the fuel line from the motor
or shut off the fuel cock, if equipped.

3. Remove the engine top cowling and si­lencer cover. Remove the propeller.

4. Install the outboard motor on the test
tank. Fill the tank with fresh water to
above the level of the anti-cavitation
plate.

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

[ECM00291]

NOTICE:

NOTICE:

Do not spray wa-

[ECM01840]

For fur-

If the fresh water level

Maintenance

1

2

ZMU02051

1. Water surface

2. Lowest water level

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

WARNING! 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.

6. Run the engine at a fast idle for a few
minutes in neutral position.

7. Just prior to turning off the engine, quick­ly spray “Fogging Oil” alternately into
each carburetor or the fogging hole of
the silencer cover, if equipped. When
properly done, the engine will smoke ex­cessively and almost stall.

8. Remove the outboard motor from the
test tank.

9. Install the silencer cover/cap of fogging
hole and top cowling.

10. If the “Fogging Oil” is not available, run
the engine at a fast idle until the fuel sys­tem becomes empty and the engine

[EWM00091]

55

Maintenance

T

stops.

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

12. If the “Fogging Oil” is not available, re­move the spark plug(s). Pour a tea­spoonful of clean engine oil into each
cylinder. Crank several times manually.
Replace the spark plug(s).

13. Drain the fuel from the fuel tank.

IP:

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

EMU28345

Flushing with the water flush plug

1. Wash the outboard motor body using
fresh water.

ter into the air intake.

NOTICE:

Do not spray wa-

For fur-

[ECM01840]

ther information, see page 57.

ZMU02871

2. Disconnect the fuel line from the motor
or shut off the fuel cock, if equipped.

3. Remove the engine top cowling and si­lencer cover. Remove the propeller.

4. Remove the screw located beside the
“” (wash) mark on the lower case.
Install the water flush plug and connect
it to a fresh water tap. Cover the cooling
water inlet with tape.

ECM00300

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.
Before starting the engine, be sure to
supply water to the cooling water passag­es.

ECM00310

NOTICE

Avoid running the outboard motor at high
speed while on the flushing attachment,
otherwise overheating could occur.

1

1

ZMU03757

1. Water flush plug

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

WARNING! 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.

6. Run the engine at a fast idle for a few
minutes in neutral position.

7. Just prior to turning off the engine, quick­ly spray “Fogging Oil” alternately into
each carburetor or the fogging hole of

[EWM00091]

56

Maintenance

T

T

T

the silencer cover, if equipped. When
properly done, the engine will smoke ex­cessively and almost stall.

8. Remove the water flush plug and the
tape.

9. Install the silencer cover/cap of fogging
hole and top cowling.

10. If the “Fogging Oil” is not available, run
the engine at a fast idle until the fuel sys­tem becomes empty and the engine
stops.

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

12. If the “Fogging Oil” is not available, re­move the spark plug(s). Pour a tea­spoonful of clean engine oil into each
cylinder. Crank several times manually.
Replace the spark plug(s).

13. Drain the fuel from the fuel tank.

IP:

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

EMU28411

Lubrication (oil injection models)

1. Install the spark plug(s) and torque to
proper specification. For information on
spark plug installation, see page 63.

2. Fill the oil tanks. This prevents the for­mation of condensation. For models with
a remote oil tank, it may be necessary to
manually override the control unit to
completely fill the engine oil tank.

3. Change the gear oil. For instructions,
see page 67. Inspect the oil for the pres­ence of water which indicates a leaky
seal. Seal replacement should be per­formed by an authorized Yamaha dealer
prior to use.

4. Grease all grease fittings. For further de­tails, see page 62.

IP:

For long-term storage, fogging the engine
with oil is recommended. Contact your
Yamaha dealer for information about fogging
oil and procedures for your engine.

EMU28450

Cleaning the outboard motor

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

IP:

For cooling system flushing instructions, see
page 54.

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.

EMU2847A

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,
have a Yamaha dealer or other qualified
mechanic do the work.
The procedures involve disassembling

57

Maintenance

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.

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.

EMU34150

Severe operating conditions

Severe operating conditions involve one or
more of the following types of operation on a
regular basis:

●

Operating continuously at or near maxi­mum engine speed (rpm) for many hours

●

Operating continuously at a low engine
speed (rpm) for many hours
Brief periods of rapid acceleration and de-

●

celeration followed by engine shut off be-

fore the engine has reached proper
operating temperature
Frequent quick acceleration and decelera-

●

tion

●

Frequent shifting
Frequently starting and stopping the en-

●

gine(s)

●

Operation that fluctuates often between

light and heavy cargo loads
Outboard motors operating under any of
these above conditions require more fre­quent maintenance. Yamaha recommends
that you do this service twice as often as
specified in the maintenance chart. For ex­ample, if a particular service should be done
at 50 hours, do it instead at 25 hours. This
will help prevent more rapid deterioration of
engine components.

58

Maintenance

T

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, thermostat
cover)

Anodes (exhaust cover,
cooling water passage
cover, Rectifier Regula­tor cover)

Battery (electrolyte
level, terminal)

Battery (electrolyte
level, terminal)

Cooling water leakage

Cowling clamp Inspection

Engine starting condi­tion/Noise

Engine idling speed/
Noise

Fuel filter (can be dis­assembled)

Fuel line(High pres­sure)

Inspection or replace­ment as necessary

Inspection or replace­ment as necessary

Replacement

Inspection

Fill, charging or replac­ing as necessary

Inspection or replace­ment as necessary

Inspection

Inspection

Inspection or replace­ment as necessary

Inspection

20 hours

(3

months)

100

hours (1

year)

300

hours (3

years)

500

hours (5

years)

59

Maintenance

Item Actions

Fuel line(High pres­sure)

Fuel line(Low pres­sure)

Fuel line(Low pres­sure)

Fuel pump

Fuel/oil leakage Inspection

Gear oil Replacement

Greasing points Greasing

Impeller/water pump
housing

Impeller/water pump
housing

Oil tank water drain Inspection or cleaning

Oil injection pump/oil
feed pump

Power trim & tilt unit/
Operation,noise and oil
leakage

Propeller/Propeller nut/
Cotter pin

Shift link/shift cable

Spark plug(s)

Spark plug caps/high
tension cords

Water from the cooling
water pilot hole

Throttle link/Throttle
cable/Throttle pick-up
timing

Thermostat

Water inlet Inspection

Inspection or replace­ment as necessary

Inspection

Inspection or replace­ment as necessary

Inspection or replace­ment as necessary

Inspection or replace­ment as necessary

Replacement

Inspection or Adjust­ment

Inspection

Inspection or replace­ment as necessary

Inspection, adjustment
or replacement as nec­essary

Inspection or replace­ment as necessary

Inspection or replace­ment as necessary

Inspection

Inspection, adjustment
or replacement as nec­essary

Inspection or replace­ment as necessary

Initial Every

20 hours

(3

months)

100

hours (1

year)

hours (3

years)

300

500

hours (5

years)

60

Item Actions

Main switch/stop
switch/choke switch

Wire harness connec­tions/Wire coupler con­nections

(Yamaha) Fuel tank

EMU34451

Maintenance chart 2

Item Actions

Guide exhaust/exhaust
manifold

Inspection or replace­ment as necessary

Inspection or replace­ment as necessary

Inspection and clean­ing as necessary

Inspection or replace­ment as necessary

Maintenance

Initial Every

20 hours

(3

months)

100

hours (1

year)

1000 hours

hours (3

years)

Every

300

500

hours (5

years)

61

Maintenance

EMU28941

Greasing

Yamaha grease A (water resistant grease)
Yamaha grease D (corrosion resistant grease; for propeller shaft)

30DMHO

62

ZMU03793

30DEO, 30DETO

Maintenance

EMU28955

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 exam­ple, 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.

ZMU04860

Instead, take the outboard motor to a
Yamaha dealer. You should periodically re­move and inspect the spark plug because
heat and deposits will cause the spark plug
to slowly break down and erode. If electrode
erosion becomes excessive, or if carbon and
other deposits are excessive, you should re­place the spark plug with another of the cor­rect type.

63

Maintenance

T

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:

BR7HS-10

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; adjust the gap to spec­ification if necessary.

the correct torque.

Spark plug torque:

25.0 Nm (2.55 kgf-m, 18.4 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.

1. Spark plug gap

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

3. Spark plug part number

Spark plug gap:

0.9–1.0 mm (0.035–0.039 in)

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

64

ZMU06201

EMU29041

Inspecting idling speed

EWM00451

WARNING

●

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.

ECM00490

NOTICE

This procedure must be performed while
the outboard motor is in the water. A

Maintenance

T

flushing attachment or test tank can be
used.

A diagnostic tachometer should be used 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.

IP:

Correct idling speed inspection is only possi­ble if the engine is fully warmed up. If not
warmed up fully, the idle speed will measure
higher than normal. If you have difficulty ver­ifying the idle speed, or the idle speed re­quires adjustment, consult a Yamaha dealer
or other qualified mechanic.

2. Verify whether the idle speed is set to
specification. For idle speed specifica­tions, see page 10.

EMU29061

Checking water in engine oil tank

A translucent water drain hose is connected
from the bottom of the oil tank to the filler
neck. If water or foreign matter collects in this
hose, consult a Yamaha dealer.

2

EMU29112

Checking wiring and connectors

●

Check that each grounding wire is properly
secured.

●

Check that each connector is engaged se­curely.

ZMU03737

EMU32111

Checking propeller

EWM01880

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 shut-off switch.
Turn off the battery cut-off 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

1

propeller from turning.

ZMU03748

1. Drain hose

2. Filler neck side

65

Maintenance

1

2

3

4

ZMU01897

Checkpoints

●

Check each of the propeller blades for
wear, 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 pro-

●

peller shaft.

ZMU03227

●

Check the propeller shaft oil seal for dam­age.

EMU30661

Removing propeller

EMU29197

Spline models

1. Straighten the cotter pin and pull it out
using a pair of pliers.

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

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

[EWM01890]

WARNING! Do

6

1. Cotter pin

2. Propeller nut

3. Washer

4. Spacer

5. Propeller

6. Thrust washer

5

ZMU02829

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

EMU30671

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

NOTICE:

[ECM01880]

66

Maintenance

T

T

T

specified torque.

Propeller nut tightening torque:

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

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

TICE:

Do not reuse the cotter pin in-

NO-

stalled. Otherwise the propeller can
come off during operation.

[ECM01890]

ZMU02063

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 pos-

sible.

2. Place a suitable container under the
gear case.

3. Remove the gear oil drain screw and
gasket.

NOTICE:

If there is an exces­sive quantity of metal particles on the
magnetic gear oil drain screw, this
can indicate lower unit problem. Con­sult your Yamaha dealer.

[ECM01900]

2

1

ZMU03738

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.

TICE:

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 fill-

NO-

67

Maintenance

ing device, inject the gear oil into the
gear oil drain screw hole.

Recommended gear oil:

Hypoid gear oil SAE#90

Gear oil quantity:

0.200 L (0.211 US qt, 0.176 Imp.qt)

ZMU03739

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)

flames, or other sources of ignition
when cleaning the fuel tank.
Remove the fuel tank from the boat be-

●

fore cleaning it. Work only outdoors in
an area with good ventilation.
Wipe up any spilled fuel immediately.

●

●

Reassemble the fuel tank carefully. Im­proper 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.

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)

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,

68

ZMU03231

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

Maintenance

T

ZMU02066

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

ZMU02924

ZMU03799

EMU29322

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

●

gloves.

●

Do not smoke or bring any other source

of ignition near the battery.
Refer to page 12 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

69

Maintenance

battery manufacturer’s instructions.

ECM01920

NOTICE

A poorly maintained battery will quickly
deteriorate.

1. Check the electrolyte level.

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]

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.

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.

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

[ECM01930]

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 instruc-

NOTICE:

NOTICE:

If

Al-

70

tions.

Maintenance

71

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 38.

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.

72

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.

73

Trouble Recovery

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.

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

74

Q. Is air vent screw closed?
A. Open the air vent screw.

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

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.

EMU29463

Replacing fuse

If the fuse has blown on an electric start
model, open the fuse holder and replace the
fuse with a new 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.

75

Trouble Recovery

1

2

ZMU04849

1. Fuse holder

2. Fuse (10 A)

Consult your Yamaha dealer if the new fuse
immediately blows again.

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.

1

ZMU03800

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-

●

76

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.

●

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.

EMU29562

Emergency starting engine

1. Remove the top cowling.

2. Remove the start-in-gear protection ca­ble from the starter, if equipped.

Trouble Recovery

ZMU03802

4. Prepare the engine for starting. For fur­ther information, see page 38. Be sure
the engine is in neutral and that the clip
is attached to the engine shut-off switch.
The main switch must be “ ” (on), if
equipped.

ZMU03803

ZMU03801

3. Remove the starter/flywheel cover after
removing the bolt(s).

ZMU02334

77

Trouble Recovery

ON STARTOFF

ZMU01906

5. If equipped the choke knob, pull out it
when the engine is cold. After the engine
starts, gradually return the choke knob
to its home position as the engine warms
up.

ZMU03804

6. Insert the knotted end of the emergency
starter rope into the notch in the flywheel
rotor and wind the rope several turns
around the flywheel clockwise.

7. Give a strong pull straight out to crank
and start the engine. Repeat if neces­sary.

ZMU02928

EMU33501

Treatment of submerged motor

If the outboard motor is submerged, immedi­ately take it to a Yamaha dealer. Otherwise
some corrosion may begin almost immedi­ately.

NOTICE:

outboard motor until it has been com­pletely inspected.

Do not attempt to run the

[ECM00401]

78

YAMAHA MOTOR CO., LTD.

Printed in Japan
April 2008–0.3 × 1

!

Printed on recycled paper