Page 1
OWNER’S MANUAL
F80B
F100D
6D7-28199-72-E0
Page 2
Read this owner’s manual carefully before operating your outboard motor.
Page 3
Important manual information
EMU25101
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.
The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED!
EWM00780
WARNING
Failure to follow WARNING instructions
could result in severe injury or death
machine operator, a bystander, or a person inspecting or repairing the outboard
motor.
ECM00700
CAUTION:
A CAUTION indicates special precautions
that must be taken to avoid damage to the
outboard motor.
to the
your machine and this manual. If 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. Note that if you do not
follow these instructions, not only may the
product break down, but the warranty will also
be voided.
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.
NOTE:
The F80BET, F100DET 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.
NOTE:
A NOTE 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
Page 4
Important manual information
EMU25120
F80B, F100D
OWNER’S MANUAL
©2006 by Yamaha Motor Co., Ltd.
1st Edition, February 2006
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Co., Ltd.
is expressly prohibited.
Printed in Japan
Page 5
Table of contents
General information ..........................1
Identification numbers record.......... 1
Outboard motor serial number ........... 1
Key number........................................ 1
EC label........................................... 1
Safety information ........................... 2
Important labels............................... 3
Warning labels.................................... 3
Fueling instructions ......................... 3
Gasoline ............................................. 4
Engine oil............................................ 4
Battery requirement......................... 4
Battery specifications ......................... 4
Propeller selection........................... 5
Start-in-gear protection ................... 5
Basic components ............................ 7
Main components ............................ 7
Fuel tank............................................. 8
Fuel joint............................................. 8
Fuel gauge ......................................... 9
Fuel tank cap...................................... 9
Air vent screw..................................... 9
Remote control................................... 9
Remote control lever .......................... 9
Neutral interlock trigger ...................... 9
Neutral throttle lever........................... 9
Tiller handle...................................... 10
Gear shift lever................................. 10
Throttle grip ...................................... 10
Throttle indicator............................... 10
Throttle friction adjuster.................... 11
Engine stop lanyard switch............... 11
Engine stop button ........................... 12
Main switch....................................... 12
Power trim and tilt switch on remote
control or tiller handle.................... 13
Power trim and tilt switch on bottom
engine cowling .............................. 13
Variable trolling RPM switches......... 13
Trim tab with anode.......................... 14
Tilt support lever for power trim and
tilt or hydro tilt model..................... 14
Top cowling lock lever
(pull up type) ................................. 15
Flushing device ................................ 15
Water separator................................ 15
Warning indicator ............................. 16
Digital tachometer ............................ 16
Low oil pressure warning indicator... 16
Overheat warning indicator
(digital type) .................................. 17
Speedometer (digital type) ............... 17
Trim meter (digital type) ................... 17
Hour meter (digital type)................... 18
Trip meter ......................................... 18
Clock ................................................ 18
Fuel gauge ....................................... 19
Fuel warning indicator ...................... 19
Low battery voltage warning
indicator ........................................ 19
6Y8 Multifunction meters.................. 20
Tachometer unit ............................... 20
Speed & fuel meter unit.................... 23
Speedometer unit............................. 24
Fuel management meter .................. 25
Warning system ............................ 26
Overheat warning............................. 26
Low oil pressure warning.................. 26
Operation ......................................... 28
Installation..................................... 28
Mounting the outboard motor ........... 28
Breaking in engine ........................ 29
Procedure for 4-stroke models ......... 29
Preoperation checks ..................... 29
Fuel .................................................. 29
Controls ............................................ 30
Engine .............................................. 30
Checking the engine oil level............ 30
Filling fuel...................................... 30
Operating engine .......................... 31
Feeding fuel (portable tank) ............. 31
Starting engine ................................. 32
Warming up engine....................... 34
Electric start models......................... 34
Page 6
Table of contents
Shifting .......................................... 35
Forward (tiller handle and remote
control models) ............................. 35
Reverse (automatic reverse lock
and power trim and tilt models)..... 36
Trolling .......................................... 36
Adjusting trolling speed .................... 36
Stopping engine ............................ 37
Procedure......................................... 37
Trimming outboard motor .............. 37
Adjusting trim angle.......................... 38
Adjusting boat trim............................ 39
Tilting up and down ....................... 40
Procedure for tilting up (power trim
and tilt models / power tilt
models) ......................................... 40
Procedure for tilting down (power
trim and tilt models / power tilt
models) ......................................... 41
Cruising in shallow water .............. 42
Power trim and tilt models / power
tilt models...................................... 42
Cruising in other conditions ........... 43
Maintenance..................................... 44
Specifications ................................ 44
Transporting and storing outboard
motor .......................................... 45
Storing outboard motor..................... 45
Procedure......................................... 46
Lubrication........................................ 47
Battery care...................................... 47
Flushing power unit .......................... 48
Cleaning the outboard motor............ 49
Checking painted surface of motor... 49
Periodic maintenance.................... 49
Replacement parts ........................... 49
Maintenance chart............................ 50
Maintenance chart (additional)......... 51
Greasing........................................... 52
Cleaning and adjusting spark plug ... 52
Checking fuel system ....................... 53
Changing engine oil.......................... 54
Checking wiring and connectors ...... 55
Exhaust leakage............................... 56
Water leakage .................................. 56
Engine oil leakage............................ 56
Checking power trim and tilt / power
tilt system ...................................... 56
Checking propeller ........................... 56
Removing the propeller .................... 57
Installing the Propeller...................... 57
Changing gear oil ............................. 58
Cleaning fuel tank............................. 59
Inspecting and replacing anode(s) ... 60
Checking battery (for electric start
models) ......................................... 60
Connecting the battery ..................... 61
Disconnecting the battery................. 61
Checking top cowling ....................... 61
Coating the boat bottom ................... 62
Trouble Recovery............................ 63
Troubleshooting ............................ 63
Temporary action in emergency ... 66
Impact damage................................. 66
Replacing fuse.................................. 66
Power trim and tilt / power tilt will not
operate.......................................... 67
Water separator warning indicator
blinks while cruising ...................... 67
Starter will not operate ..................... 69
Emergency starting engine............... 70
Treatment of submerged motor .... 71
Procedure......................................... 71
Page 7
EMU25170
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
ZMU04214
1. Outboard motor serial number location
General information
1. Key number
EMU25202
EC label
Engines affixed with this label conform to certain portions of the European Parliament directive relating to machinery. Refer to the
label and the EC Declaration of Conformity for
more details.
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. EC label location
1
Page 8
General information
ZMU01696
EMU25371
Safety information
● Before mounting or operating the outboard
motor, read this entire manual. Reading it
should give you an understanding of the
motor and its operation.
● Before operating the boat, read any own-
er’s or operator’s manuals supplied with it
and all labels. Be sure you understand each
item before operating.
● Do not overpower the boat with this out-
board motor. Overpowering the boat could
result in loss of control. The rated power of
the outboard should be equal to or less than
the rated horsepower capacity of the boat.
If the rated horsepower capacity of the boat
is unknown, consult the dealer or boat manufacturer.
● Do not modify the outboard. Modifications
could make the motor unfit or unsafe to use.
● Incorrect propeller selection and incorrect
use may not only cause engine damage,
but also adversely affect fuel consumption.
Consult your dealer for correct use.
● Never operate after drinking alcohol or tak-
ing drugs. About 50% of all boating fatalities
involve intoxication.
● Have an approved personal flotation device
(PFD) on board for every occupant. It is a
good idea to wear a PFD whenever boat-
ing. At a minimum, children and non-swimmers should always wear PFDs, and
everyone should wear PFDs when there
are potentially hazardous boating conditions.
● Gasoline is highly flammable, and its va-
pors are flammable and explosive. Handle
and store gasoline carefully. Make sure
there are no gas fumes or leaking fuel before starting the engine.
● 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.
● Check throttle, shift, and steering for proper
operation before starting the engine.
● Attach the engine stop switch lanyard to a
secure place on your clothing, or your arm
or leg while operating. If you accidentally
leave the helm, the lanyard will pull from the
switch, stopping the engine.
● Know the marine laws and regulations
where you will be boating - and obey them.
● Stay informed about the weather. Check
weather forecasts before boating. Avoid
boating in hazardous weather.
● Tell someone where you are going: leave a
Float Plan with a responsible person. Be
sure to cancel the Float Plan when you return.
● Use common sense and good judgment
when boating. Know your abilities, and be
sure you understand how your boat handles under the different boating conditions
you may encounter. Operate within your
limits, and the limits of your boat. Always
operate at safe speeds, and keep a careful
watch for obstacles and other traffic.
2
Page 9
General information
● Always watch carefully for swimmers during
the engine operation.
● Stay away from swimming areas.
● When a swimmer is in the water near you
shift into neutral and shut off the engine.
● Do not illegally discard empty containers
used to replace or replenish oil. For the correct processing of empty containers, consult the dealer where you purchased the oil.
● When replacing oils used to lubricate the
product (engine or gear oil), be sure to wipe
away any spilt oil. Never pour oil without using a funnel or similar device. If necessary,
verify the necessary replacement procedure with the dealer.
● Never illegally discard (dump) the product.
Yamaha recommends consulting the dealer on discarding the product.
EMU25382
Important labels
EMU25395
Warning labels
EMU25401
Label
EWM01260
WARNING
● Be sure shift control is in neutral before
starting engine. (except 2HP)
● Do not touch or remove electrical parts
when starting or during operation.
● Keep hands, hair, and clothes away from
flywheel and other rotating parts while
engine is running.
EMU25540
Fueling instructions
EWM00010
WARNING
GASOLINE AND ITS VAPORS ARE HIGHLY FLAMMABLE AND EXPLOSIVE!
● Do not smoke when refueling, and keep
away from sparks, flames, or other
sources of ignition.
● Stop engine before refueling.
● Refuel in a well-ventilated area. Refuel
portable fuel tanks off the boat.
● Take care not to spill gasoline. If gaso-
line spills, wipe it up immediately with
dry rags.
● Do not overfill the fuel tank.
● Tighten the filler cap securely after refu-
eling.
● If you should swallow some gasoline, in-
hale a lot of gasoline vapor, or get gasoline in your eyes, get immediate medical
attention.
● If any gasoline spills onto your skin, im-
mediately wash with soap and water.
Change clothing if gasoline spills on it.
● Touch the fuel nozzle to the filler open-
ing or funnel to help prevent electrostatic sparks.
ECM00010
CAUTION:
Use only new clean gasoline which has
been stored in clean containers and is not
contaminated with water or foreign matter.
3
Page 10
General information
EMU25580
Gasoline
Recommended gasoline:
Regular unleaded gasoline with a minimum octane rating of 90 (Research
Octane Number).
If knocking or pinging occurs, use a different
brand of gasoline or premium unleaded fuel.
EMU25683
Engine oil
Recommended engine oil:
4-stroke motor oil with a combination of
the following SAE and API oil classifications
Engine oil type SAE:
10W-30 or 10W-40
Engine oil grade API:
SE, SF, SG, SH, SJ, SL
Engine oil quantity (excluding oil filter):
4.3 L (4.55 US qt) (3.78 Imp.qt)
NOTE:
If the recommended engine oil grades are not
available, select an alternative from the following chart according to the average temperatures in your area.
ECM01050
CAUTION:
All 4-stroke engines are shipped from the
factory without engine oil.
ZMU01710
EMU25700
Battery requirement
ECM01060
CAUTION:
Do not use a battery that does not meet the
specified capacity. If a battery which does
not meet specifications is used, the electric system could perform poorly or be
overloaded, causing electric system damage.
For electric start models, choose a battery
which meets the following specifications.
EMU25720
Battery specifications
Minimum cold cranking amps (CCA/EN):
430.0 A
Minimum rated capacity (20HR/IEC):
70.0 Ah
NOTE:
The engine cannot be started if battery voltage is too low.
4
Page 11
EMU25742
Propeller selection
The performance of your outboard motor will
be critically affected by your choice of propeller, as an incorrect choice could adversely affect performance and could also seriously
damage the motor. Engine speed depends on
the propeller size and boat load. If engine
speed is too high or too low for good engine
performance, this will have an adverse effect
on the engine.
Yamaha outboard motors are fitted with propellers chosen to perform well over a range of
applications, but there may be uses where a
propeller with a different pitch would be more
appropriate. For a greater operating load, a
smaller-pitch propeller is more suitable as it
enables the correct engine speed to be maintained. Conversely, a larger-pitch propeller is
more suitable for a smaller operating load.
Yamaha dealers stock a range of propellers,
and can advise you and install a propeller on
your outboard that is best suited to your application.
x
-
123
ZMU04606
1. Propeller diameter in inches
2. Propeller pitch in inches
3. Type of propeller (propeller mark)
General information
x
-
123
ZMU04607
1. Propeller diameter in inches
2. Propeller pitch in inches
3. Type of propeller (propeller mark)
NOTE:
Select a propeller which will allow the engine
to reach the middle or upper half of the operating range at full throttle with the maximum
boat load. If operating conditions such as light
boat loads then allow the engine r/min to rise
above the maximum recommended range, reduce the throttle setting to maintain the engine in the proper operating range.
For instructions on propeller removal and installation, see page 56.
EMU25760
Start-in-gear protection
Yamaha outboard motors affixed with the pictured label or Yamaha-approved remote control units are equipped with start-in-gear
protection device(s). This feature permits the
engine to be started only when it is in neutral.
Always select neutral before starting the engine.
5
Page 12
General information
1
ZMU01713
1. Start-in-gear protection label
6
Page 13
Basic components
EMU25799
Main components
NOTE:
* May not be exactly as shown; also may not be included as standard equipment on all models.
1. Top cowling
2. Top cowling lock lever(s)
3. Anti-cavitation plate
4. Trim tab (anode)
5. Propeller*
6. Cooling water inlet
7. Clamp bracket
8. Flushing device
9. Water separator
10.Power trim and tilt switch
11.Remote control box (side mount type)*
12.Digital speedometer*
13.Digital tachometer*
14.Fuel tank*
7
Page 14
Basic components
1
4
1. Tachometer unit (Square type)*
2. Tachometer unit (Round type)*
3. Speedometer unit (Square type)*
4. Speed & fuel meter unit (Square type)*
5. Speed & fuel meter unit (Round type)*
6. Fuel management meter (Square type)*
EMU25802
2
5
Fuel tank
If your model was equipped with a portable
fuel tank, its function is as follows.
EWM00020
WARNING
The fuel tank supplied with this engine is
its dedicated fuel reservoir and must not
be used as a fuel storage container. Commercial users should conform to relevant
licensing or approval authority regulations.
3
6
ZMU05429
1. Fuel joint
2. Fuel gauge
3. Fuel tank cap
4. Air vent screw
EMU25830
Fuel joint
This joint is used to connect the fuel line.
8
Page 15
Basic components
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.
EMU26180
Remote control
The remote control lever actuates both the
shifter and the throttle. The electrical switches
are mounted on the remote control box.
is moved about 35° (a detent can be felt).
Moving the lever farther opens the throttle,
and the engine will begin to accelerate.
1. Neutral “”
2. Forward “”
3. Reverse “”
4. Shift
5. Fully closed
6. Throttle
7. Fully open
EMU26201
Neutral interlock trigger
To shift out of neutral, first pull the neutral interlock trigger up.
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 stop lanyard 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
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.
9
Page 16
Basic components
NOTE:
The neutral throttle lever will operate only
when the remote control lever is in neutral.
The remote control lever will operate only
when the neutral throttle lever is in the closed
position.
1. Fully open
2. Fully closed
EMU25911
Tiller handle
To change direction, move the tiller handle to
the left or right as necessary.
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.
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.
10
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.
Page 17
Basic components
1. Throttle indicator
EMU25971
Throttle friction adjuster
A friction device provides adjustable resistance to movement of the throttle grip or the
remote control lever, and can be set according to operator preference.
To increase resistance, turn the adjuster
clockwise. To decrease resistance, turn the
adjuster counterclockwise.
EWM00031
WARNING
Do not overtighten the friction adjuster. If
there is too much resistance, it could be
difficult to move the remote control lever
or throttle grip, which could result in an
accident.
When constant speed is desired, tighten the
adjuster to maintain the desired throttle setting.
EMU25990
Engine stop lanyard switch
The lock plate must be attached to the engine
stop switch for the engine to run. The lanyard
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
lanyard will pull out the lock plate, stopping ignition to the engine. This will prevent the boat
from running away under power.
EWM00120
WARNING
● Attach the engine stop switch lanyard to
a secure place on your clothing, or your
arm or leg while operating.
● Do not attach the lanyard to clothing
that could tear loose. Do not route the
lanyard where it could become entangled, preventing it from functioning.
● Avoid accidentally pulling the lanyard
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.
11
Page 18
Basic components
NOTE:
The engine cannot be started with the lock
plate removed.
1. Lanyard
2. Lock plate
EMU26090
Main switch
The main switch controls the ignition system;
its operation is described below.
● “” (off)
With the main switch in the “” (off) posi-
tion, the electrical circuits are off, and the key
can be removed.
● “” (on)
With the main switch in the “” (on) position,
the electrical circuits are on, and the key cannot be removed.
● “” (start)
With the main switch in the “” (start) po-
sition, the starter motor turns to start the engine. When the key is released, it returns
automatically to the “” (on) position.
1. Lanyard
2. Lock plate
EMU26001
Engine stop button
To open the ignition circuit and stop the engine, push this button.
12
Page 19
Basic components
EMU26141
Power trim and tilt switch on remote
control or tiller handle
The power trim and tilt system adjusts the outboard motor angle in relation to the transom.
Pressing the switch “” (up) trims the out-
board motor up, 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.
NOTE:
For instructions on using the power trim and
tilt switch, see pages 37 and 40.
(down) tilts the outboard motor down and
trims it down. When the switch is released,
the outboard motor will stop in its current position.
EWM01030
WARNING
Use the power trim and tilt switch located
on the bottom engine cowling only when
the boat is at a complete stop with the engine off. Attempting to use this switch
while the boat is moving could increase
the risk of falling overboard and could distract the operator, increasing the risk of
collision with another boat or an obstacle.
UP
1
DN
ZMU04231
1. Power trim and tilt switch
EMU26151
Power trim and tilt switch on bottom
engine cowling
The power trim and tilt switch is located on the
side of the bottom engine cowling. Pressing
the switch “” (up) trims the outboard motor
up, then tilts it up. Pressing the switch “”
NOTE:
For instructions on using the power trim and
tilt switch, see page 40.
EMU30900
Variable trolling RPM switches
The trolling speed can be adjusted when the
outboard motor is trolling. Press the “”
switch to increase the trolling speed and
press the “” switch to decrease the trolling
speed.
NOTE:
● The trolling speed changes approximately
50 r/min each time a switch is pressed.
13
Page 20
Basic components
● If the trolling speed has been adjusted, the
engine returns to the normal trolling speed
when the engine is stopped and restarted
or when the engine speed exceeds approximately 3000 r/min.
● For instructions on using the variable troll-
ing RPM switches, see page 36.
1. Variable trolling RPM switch
EMU26241
Trim tab with anode
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.
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.
If the boat tends to veer the left (port side),
turn the trim tab rear end to the port side “A” in
the figure. If the boat tends to veer the right
(starboard side), turn the trim tab end to the
starboard side “B” in the figure.
ECM00840
CAUTION:
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.
3
2
1
B
A
ZMU02525
1. Trim tab
2. Bolt
3. Cap
A
B
ZMU01863
EMU26340
Tilt support lever for power trim and
tilt or hydro tilt model
To keep the outboard motor in the tilted up position, lock the tilt support lever to the clamp
bracket.
14
Page 21
1. Tilt support lever
EMU26382
Top cowling lock lever (pull up type)
To remove the engine top cowling, pull up 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 by moving the lever(s) downward.
1
Basic components
EMU26460
Flushing device
This device is used to clean the cooling water
passages of the motor using a garden hose
and tap water.
NOTE:
For details on usage, see page 48.
1. Flushing device
EMU31702
Water separator
This engine has a combination fuel filter/water
separator and associated warning system. If
water separated from the fuel exceeds a specific volume, the warning device will activate.
1. Top cowling lock lever(s)
1. Top cowling lock lever(s)
ZMU04225
ZMU04226
1
Activation of warning device
● The water separator warning indicator will
blink.
● The buzzer will sound intermittently only
when the gear shift is in neutral.
15
Page 22
Basic components
● If the warning system has activated, stop
the engine and consult a Yamaha dealer
immediately.
EMU26302
Warning indicator
If the engine develops a condition which is
cause for warning, the indicator lights up. For
details on how to read the warning indicator,
see page 26.
1. Warning indicator
EMU31410
Digital tachometer
The tachometer shows the engine speed and
has the following functions.
NOTE:
All segments of the display will light momentarily after the main switch is turned on and
will return to normal thereafter.
5. Overheat warning indicator
6. Set button
7. Mode button
NOTE:
The water separator warning indicator and
engine trouble warning indicator on the digital
tachometer do not operate for this engine.
EMU26522
Low oil pressure warning indicator
If oil pressure drops too low, the warning indicator will start to blink. For further information,
see page 26.
ECM00020
CAUTION:
● Do not continue to run the engine if the
low oil pressure warning indicator is on
and the engine oil level is lower. Serious
engine damage will occur.
● The low oil pressure warning indicator
does not indicate the engine oil level.
Use the oil dipstick to check the remaining oil quantity. For further information,
see page 30.
1
3
5
6
1. Tachometer
2. Trim meter
3. Hour meter
4. Low oil pressure warning indicator
16
7
ZMU01840
2
1
ZMU01736
1. Low oil pressure warning indicator
4
Page 23
Basic components
EMU26581
Overheat warning indicator (digital
type)
If the engine temperature rises too high, the
warning indicator will start to blink. For further
information on reading the indicator, see page
26.
ECM00050
CAUTION:
Do not continue to run the engine if the
overheat warning indicator is on. Serious
engine damage will occur.
1
ZMU01737
1. Overheat warning indicator
EMU26600
Speedometer (digital type)
This gauge shows the boat speed.
NOTE:
After the main switch is first turned on, all segments of the display come on as a test. After
a few seconds, the gauge will change to normal operation. Watch the gauge when turning
on the main switch to make sure all segments
come on.
NOTE:
The speedometer displays km/h, mph, or
knots, according to operator preference. Select the desired unit of measurement by setting the selector switch on the back of the
gauge. See the illustration for settings.
1. Cap
2. Selector switch (for speed unit)
3. Selector switch (for fuel sensor)
EMU26620
Trim meter (digital type)
This meter shows the trim angle of your outboard motor.
1. Speedometer
2. Fuel gauge
3. Trip meter/clock/voltmeter
4. Warning indicator(s)
NOTE:
● Memorize the trim angles that work best for
your boat under different conditions. Adjust
the trim angle to the desired using the power trim and tilt switch.
● If the trim angle of your motor exceeds the
trim operating range, the top segment on
the trim meter display will blink.
17
Page 24
Basic components
ZMU01740
EMU26650
Hour meter (digital type)
This meter shows the number of hours the engine has been run. It can be set to show the
total number of hours or the number of hours
for the current trip. The display can also be
turned on and off.
ZMU01741
● Changing the display format
Pressing the “” (mode) button chang-
es the display format in the following pattern:
Total hours→Trip hours →Display off
● Resetting the trip hours
Simultaneously pressing the “” (set) and
“” (mode) buttons for more than 1 sec-
ond while the trip hours are displayed resets the trip counter to 0 (zero).
NOTE:
The total number of hours the engine has
been run cannot be reset.
EMU26690
Trip meter
This gauge displays the distance the boat has
traveled since the gauge was last reset.
Press the “” (mode) button repeatedly
until the indicator on the face of the gauge
points to “” (trip). To reset the trip meter to
zero, press the “” (set) and “” (mode)
buttons at the same time.
NOTE:
● The trip distance is shown in kilometers or
miles depending upon the unit of measurement selected for the speedometer.
● The trip distance is kept in memory by bat-
tery power. The stored data will be lost if the
battery is disconnected.
EMU26700
Clock
Press the “” (mode) button repeatedly
until the indicator on the face of the gauge
points to “” (time). To set the clock, be
sure the gauge is in the “” (time) mode.
Press the “” (set) button; the hour display
will begin blinking. Press the “” (mode)
button until the desired hour is displayed.
Press the “” (set) button again, the minute
display will begin blinking. Press the “”
(mode) button until the desired minute is displayed. Press the “” (set) button again to
start the clock.
18
Page 25
Basic components
ZMU01745
NOTE:
The clock operates on battery power. Disconnecting the battery will stop the clock. Reset
the clock after connecting the battery.
EMU26710
Fuel gauge
The fuel level is indicated by eight segments.
When all segments are showing, the fuel tank
is full.
ECM00860
CAUTION:
The Yamaha fuel tank sensor differs from
conventional sensors. Incorrectly setting
the selector switch on the gauge will give
false readings. Consult your Yamaha dealer on how to correctly set the selector
switch.
NOTE:
The fuel level reading can be affected by the
position of the sensor in the fuel tank and the
attitude of the boat in the water. Operation
with bow-up trim or continuous turning can
give false readings.
EMU26720
Fuel warning indicator
If the fuel level decreases to one segment, the
fuel level warning segment will begin to blink.
ECM00880
CAUTION:
Do not continue to operate the engine with
full throttle if a warning device has activated. Get back to the port within trolling engine speed.
1. Fuel level warning segment
EMU26730
Low battery voltage warning indicator
If battery voltage drops, the display will automatically turn on and begin to blink.
ECM00870
CAUTION:
Get back to the port soon if a warning device has activated. For charging the battery, consult your Yamaha dealer.
19
Page 26
Basic components
1. Low battery indicator
EMU31651
6Y8 Multifunction meters
Multifunction meters have 6 kinds of meter
units; tachometer unit (square or round
types), speedometer unit (square type),
speed & fuel meter unit (square or round
types), and fuel management meter (square
type). The indicator system is slightly different
between the round and square types. Check
the model and type of your unit carefully. This
manual describes mainly the warning indicators. For more details on setting meters or
changing indicator systems, see the attached
operation manual.
EMU31680
Tachometer unit
The tachometer shows the engine revolutions
per minute. It has functions of trim meter, adjusting trolling speed, cooling water/engine
temperature display, battery voltage display,
total hour/trip hour display, oil pressure display, water detection warning, engine trouble
warning, and periodic maintenance notification. If optional sensors are connected to the
unit, cooling water pressure display will be
available. For the optional sensor, consult
your Yamaha dealer. The tachometer unit is
available in round or square types. Check
your tachometer unit type.
1
1. Set button
2. Mode button
1
5
4
7
6
8
1. Tachometer
2. Trim meter
3. Multifunction display
4. Cooling water pressure
5. Cooling water/engine temperature
6. Water detection warning indicator
7. Battery voltage
8. Oil pressure (4-stroke models)
1
1. Set button
2. Mode button
2
ZMU05415
2
3
ZMU05416
2
ZMU05417
20
Page 27
Basic components
Low oil pressure warning
1452
3
When the engine oil pressure drops too low,
the low oil pressure warning indicator will start
to blink, and the engine speed will automatically decrease to about 2000 r/min.
6879
1. Tachometer
2. Trim meter
3. Multifunction display
4. Water detection warning indicator
5. Engine trouble warning/maintenance indicator
6. Cooling water pressure
7. Oil pressure (4-stroke models)
8. Cooling water/engine temperature
9. Battery voltage
ZMU05418
NOTE:
The tachometer unit shows various kinds of
information according to the setting made using the “” (set) and “” (mode) buttons.
For details, see the attached operation manual.
Preoperation checks
Place the gear shift lever in neutral and turn
the main switch to “” (on). After all the dis-
plays come on and the total hour display
comes on, the gauge will change to normal
operation. If the buzzer sounds and the water
separator warning indicator blinks, consult
your Yamaha dealer immediately.
NOTE:
To stop the buzzer, press the “” (set) or
“” (mode) button.
ZMU05430
ZMU05431
Stop the engine immediately if the buzzer
sounds and the low oil pressure warning indicator blinks. Check the engine oil quantity and
replenish oil if necessary. If the warning device has activated while the appropriate engine oil quantity is maintained, consult your
Yamaha dealer.
ECM01600
CAUTION:
Do not continue to run the engine if the
low oil pressure warning device has activated. Serious engine damage will occur.
21
Page 28
Basic components
Overheat warning
If the engine temperature rises too high while
cruising, the overheat warning indicator will
start to blink. The engine speed will automatically decrease to about 2000 r/min.
ZMU05421
ZMU05422
Water separator warning
This indicator will blink when water has accumulated in the water separator (fuel filter)
while cruising. In such an event, stop the engine immediately and see page 66 of this
manual to drain the water from the fuel filter.
Get back to the port soon and consult a
Yamaha dealer immediately.
ZMU05423
Stop the engine immediately if the buzzer
sounds and the overheat warning device has
activated. Check the cooling water inlet for
clogging.
ECM01590
CAUTION:
● Do not continue to run the engine if the
overheat warning indicator blinks. Serious engine damage will occur.
● Do not continue to operate the engine if
a warning device has activated. Consult
your Yamaha dealer if the problem cannot be located and corrected.
22
ZMU05424
ECM00910
CAUTION:
Gasoline mixed with water could cause
damage to the engine.
Engine trouble warning
This indicator will blink when the engine malfunctions while cruising. Get back to the port
soon and consult a Yamaha dealer immediately.
Page 29
Basic components
ZMU05425
ZMU05426
ECM00920
CAUTION:
In such an event, the engine will not operate properly. Consult a Yamaha dealer immediately.
Low battery voltage warning
When the battery voltage drops, the low battery voltage warning indicator and the battery
voltage value will start to blink. Get back to the
port soon if the low battery voltage warning
device has activated. For charging the battery, consult your Yamaha dealer.
ZMU05427
ZMU05428
EMU31610
Speed & fuel meter unit
This unit shows the boat speed and has the
functions of fuel meter, total fuel consumption
display, fuel economy display, fuel flow display, and system voltage display. If optional
sensors are connected to the unit, trip display,
water surface temperature display, depth display, and clock will be available. For the optional sensor, consult your Yamaha dealer.
The speed & fuel meter unit is available in
round or square types. Check your speed &
fuel meter unit type.
23
Page 30
Basic components
12
1
1. Set button
2. Mode button
1
3
1. Speedometer
2. Fuel meter
3. Multifunction display
1
1. Set button
2. Mode button
2
ZMU05432
2
ZMU05433
2
ZMU05434
3
1. Speedometer
2. Fuel meter
3. Multifunction display
ZMU05435
NOTE:
After the main switch is first turned on, all the
displays come on as a test. After a few seconds, the gauge will change to normal operation.
NOTE:
The speed & fuel meter unit shows various
kinds of information according to the setting
made with the “” (set) and “” (mode)
buttons. For details, see the attached operation manual.
EMU31620
Speedometer unit
This unit shows the boat speed and has functions of fuel meter and system voltage display. If optional sensors are connected to the
unit, trip display, water surface temperature
display, depth display, and clock will be available. For the optional sensor, consult your
Yamaha dealer.
24
Page 31
Basic components
EMU31630
Fuel management meter
This meter has functions of fuel flow meter, total consumption display, fuel economy display, and remaining fuel display.
1
1. Set button
2. Mode button
2
ZMU05436
1
3
1. Speedometer
2. Fuel meter
3. Multifunction display
NOTE:
After the main switch is first turned on, all the
displays come on as a test. After a few seconds, the gauge will change to normal operation.
NOTE:
The speedometer unit shows various kinds of
information according to the setting made using the “” (set) and “” (mode) buttons.
In addition, the speedometer can show the
desired unit of measurement such as km/h,
mph, or knots. For details, see the attached
operation manual.
2
ZMU05437
1
1. Set button
2. Mode button
2
ZMU05438
1
2
ZMU05439
1. Fuel flow meter
2. Multifunction display
NOTE:
After the main switch is first turned on, all the
displays come on as a test. After a few seconds, the gauge will change to normal operation.
NOTE:
The fuel management meter shows various
kinds of information when the operator uses
the “” (set) and “” (mode) buttons. For
details, see the attached operation manual.
25
Page 32
Basic components
EMU26801
Warning system
ECM00090
CAUTION:
Do not continue to operate the engine if a
warning device has activated. Consult
your Yamaha dealer if the problem cannot
be located and corrected.
EMU26816
Overheat warning
This engine has an overheat warning device.
If the engine temperature rises too high, the
warning device will activate.
Activation of warning device
● The engine speed will automatically de-
crease to about 2000 r/min.
● If equipped with an overheat warning indi-
cator, it will light or blink.
If the warning system has activated, stop the
engine and check the cooling water inlet for
clogging.
ZMU01757
● The buzzer will sound (if equipped on the
tiller handle, remote control box, or main
switch panel).
26
ZMU02630
EMU26855
Low oil pressure warning
If the oil pressure drops too low, the warning
device will activate.
Activation of warning device
● The engine speed will automatically de-
crease to about 2000 r/min.
Page 33
● The low oil pressure warning indicator will
light or blink.
Basic components
● The buzzer will sound.
ZMU01828
If the warning system has activated, stop the
engine as soon as it is safe to do so. Check
the oil level and add oil as needed. If the oil
level is correct and the warning device does
not switch off, consult your Yamaha dealer.
ECM00100
CAUTION:
Do not continue to run the engine if the
low oil pressure warning indicator is on.
Serious engine damage could occur.
27
Page 34
Operation
EMU26901
Installation
ECM00110
CAUTION:
Incorrect engine height or obstructions to
smooth water flow (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. Severe engine
damage may result if the motor is operated continuously in the presence of airborne water spray.
NOTE:
During water testing check the buoyancy 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 powerhead, when water rises
due to waves when the outboard is not running.
EMU26910
Mounting the outboard motor
EWM00820
WARNING
● Overpowering a boat could cause se-
vere 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.
● The information presented in this sec-
tion 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.
EWM00830
WARNING
Improper mounting of the outboard motor
could result in hazardous conditions such
as poor handling, loss of control, or fire
hazards. Observe the following:
● For permanently mounted models, your
dealer or other person experienced in
proper rigging should mount the motor.
If you are mounting the motor yourself,
you should be trained by an experienced
person.
● For portable models, your dealer or oth-
er person experienced in proper outboard motor mounting should show you
how to mount your motor.
Mount the outboard motor on the center line
(keel line) of the boat, and ensure that the
boat itself is well balanced. Otherwise the
boat will be hard to steer. For boats without a
keel or which are asymmetrical, consult your
dealer.
1
1. Center line (keel line)
EMU26930
Mounting height (boat bottom)
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
ZMU01760
28
Page 35
Operation
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 in alignment with the bottom of the
boat.
ZMU01762
NOTE:
● The optimum mounting height of the out-
board motor is affected by the boat/motor
combination and the desired use. Test runs
at different heights can help determine the
optimum mounting height. Consult your
Yamaha dealer or boat manufacturer for
further information on determining the proper mounting height.
● For instructions on setting the trim angle of
the outboard motor, see page 37.
EMU30173
Breaking in engine
Your new engine requires a period of break-in
to allow mating surfaces of moving parts to
wear in evenly. Correct break-in will help ensure proper performance and longer engine
life.
ECM00800
CAUTION:
Failure to follow the break-in procedure
could result in reduced engine life or even
severe engine damage.
EMU27081
Procedure for 4-stroke models
Run the engine under load (in gear with a propeller installed) for 10 hours as follows.
1. First hour:
Run the engine at 2000 r/min or at approximately half throttle.
2. Second hour:
Run the engine at 3000 r/min or at approximately three-quarter throttle.
3. Remaining eight hours:
Run the engine at any speed. However,
avoid operating at full throttle for more
than 5 minutes at a time.
4. After the first 10 hours:
Operate the engine normally.
EMU27103
Preoperation checks
EWM00080
WARNING
If any item in the preoperation check is not
working properly, have it inspected and
repaired before operating the outboard
motor. Otherwise an accident could occur.
ECM00120
CAUTION:
Do not start the engine out of water. Overheating and serious engine damage can
occur.
EMU31550
Fuel
● Check to be sure you have plenty of fuel for
your trip.
● Make sure there are no fuel leaks or gaso-
line fumes.
29
Page 36
Operation
● Check fuel line connections to be sure they
are tight (if equipped Yamaha fuel tank or
boat tank).
● Be sure the fuel tank is positioned on a se-
cure, flat surface, and that the fuel line is not
twisted or flattened, or likely to contact
sharp objects (if equipped Yamaha fuel
tank or boat tank).
● Check the water in the fuel filter with the wa-
ter separator warning device. Place the
gear shift lever in neutral and turn the main
switch to “”(on). If the buzzer sounds and
the water separator warning indicator
blinks, consult your Yamaha dealer immediately.
EMU27130
Controls
● Check throttle, shift, and steering for proper
operation before starting the engine.
● The controls should work smoothly, without
binding or unusual free play.
● Look for loose or damaged connections.
● Check operation of the starter and stop
switches when the outboard motor is in the
water.
EMU27150
Engine
● Check the engine and engine mounting.
● Look for loose or damaged fasteners.
● Check the propeller for damage.
● Check that the battery is in good condition
and the battery connections are secure.
EMU27163
Checking the engine oil level
1. Put the outboard motor in an upright position (not tilted).
2. Remove oil dipstick and wipe it clean.
3. Completely insert the dipstick and remove it again.
4. Check the oil level using the dipstick to be
sure the level falls between the upper and
lower marks. Fill with oil if it is below the
lower mark, or drain to the specified level
if it is above the upper mark.
1
ZMU04257
1. Oil dipstick
1. Lower level mark
2. Oil dipstick
3. Upper level mark
NOTE:
Be sure to completely insert the dipstick into
the dipstick guide.
EMU27433
Filling fuel
EWM00060
WARNING
Gasoline and its vapors are highly flammable and explosive. Keep away from
sparks, cigarettes, flames, or other sources of ignition.
30
Page 37
Operation
1. Remove the fuel tank cap.
2. Carefully fill the fuel tank.
3. Securely close the cap after filling the
tank. Wipe up any spilled fuel.
Fuel tank capacity:
25.0 L (6.61 US gal) (5.50 Imp.gal)
ZMU04047
EMU27450
Operating engine
EMU27461
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, 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.
ZMU02022
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.
ZMU02024
3. If a steering friction adjuster is provided
on your outboard motor, securely attach
the fuel line to the fuel line clamp.
NOTE:
During engine operation place the tank horizontally, otherwise fuel cannot be drawn from
the fuel tank.
4. Squeeze the primer pump with the outlet
end up until you feel it become firm.
31
Page 38
Operation
ZMU02025
EMU27490
Starting engine
EMU27592
Electric start / prime start models
1. Place the gear shift lever in neutral.
NOTE:
The start-in-gear protection device prevents
the engine from starting except when in neutral.
● Do not attach the lanyard to clothing
that could tear loose. Do not route the
lanyard where it could become entangled, preventing it from functioning.
● Avoid accidentally pulling the lanyard
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.
3. Place the throttle grip in the “”
(start) position. After the engine starts, return the throttle to the fully closed position.
2. Attach the engine stop switch lanyard to
a secure place on your clothing, or your
arm or leg. Then install the lock plate on
the other end of the lanyard into the engine stop switch.
EWM00120
WARNING
● Attach the engine stop switch lanyard to
a secure place on your clothing, or your
arm or leg while operating.
32
4. Turn the main switch to “” (start),
and hold it for a maximum of 5 seconds.
Page 39
NOTE:
The start-in-gear protection device prevents
the engine from starting except when in neutral.
5. Immediately after the engine starts, release the main switch and allow it to return to “” (on).
ECM00191
CAUTION:
● Never turn the main switch to “”
(start) while the engine is running.
● Do not keep the starter motor turning for
more than 5 seconds. If the starter motor
is turned continuously for more than 5
seconds, the battery will be quickly discharged, thus making it impossible to
start the engine. The starter can also be
damaged. If the engine will not start after
5 seconds of cranking, return the main
switch to “” (on), wait 10 seconds,
then crank the engine again.
2. Attach the engine stop switch lanyard to
EWM00120
● Attach the engine stop switch lanyard to
● Do not attach the lanyard to clothing
NOTE:
● When the engine is cold, it needs to be
warmed up. For further information, see
page 34.
● If the engine is warm and fails to start, open
the throttle slightly and try to start the engine again. If the engine still fails to start,
see page 63.
EMU27624
Electric start and remote control models
1. Place the remote control lever in “”
(neutral).
● Avoid accidentally pulling the lanyard
Operation
a secure place on your clothing, or your
arm or leg. Then install the lock plate on
the other end of the lanyard into the engine stop switch.
WARNING
a secure place on your clothing, or your
arm or leg while operating.
that could tear loose. Do not route the
lanyard where it could become entangled, preventing it from functioning.
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.
33
Page 40
Operation
3. Turn the main switch to “” (on).
NOTE:
Dual engine users: When the main switch is
turned on, the buzzer operates for a few seconds then stops automatically. The buzzer
also operates if one of the engines stalls.
4. Turn the main switch to “” (start),
and hold it for a maximum of 5 seconds.
ON
OFF
START
ZMU01881
5. Immediately after the engine starts, release the main switch to return it to “”
(on).
ECM00191
CAUTION:
● Never turn the main switch to “”
(start) while the engine is running.
● Do not keep the starter motor turning for
more than 5 seconds. If the starter motor
is turned continuously for more than 5
seconds, the battery will be quickly discharged, thus making it impossible to
start the engine. The starter can also be
damaged. If the engine will not start after
5 seconds of cranking, return the main
switch to “” (on), wait 10 seconds,
then crank the engine again.
EMU27670
Warming up engine
EMU30031
Electric start models
1. After starting the engine, allow it to idle for
3 minutes to warm up. Failure to do so will
shorten engine life.
2. Be sure the low oil pressure warning indicator remains off after starting the engine.
3. Check for a steady flow of water from the
cooling water pilot hole.
ECM01341
CAUTION:
● If the low oil pressure warning indicator
blinks after the engine starts, stop the
engine. Otherwise serious engine damage could occur. Check the oil level and
add oil if necessary. Consult your
Yamaha dealer if the cause for the low
oil pressure warning indicator cannot be
found.
● A continuous flow of water from the pilot
hole shows that the water pump is
pumping water through the cooling pas-
34
Page 41
Operation
sages. 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.
● If the cooling passage is frozen, it may
take awhile for water to start flowing out
of the pilot hole.
EMU27740
Shifting
EWM00180
WARNING
Before shifting, make sure there are no
swimmers or obstacles in the water near
you.
ECM00220
CAUTION:
To change the boat direction or shifting
position from forward to reverse or viceversa, first close the throttle so that the engine idles (or runs at low speeds).
EMU27764
Forward (tiller handle and remote control models)
Tiller handle models
1. Place the throttle grip in the fully closed
position.
2. Move the gear shift lever quickly and firmly from neutral to forward.
Remote control models
Pull up the neutral interlock trigger (if
equipped) and move the remote control lever
quickly and firmly from neutral to forward.
35
Page 42
Operation
EMU27785
Reverse (automatic reverse lock and
power trim and tilt models)
EWM00190
WARNING
When operating in reverse, go slowly. Do
not open the throttle more than half. Otherwise the boat could become unstable,
which could result in loss of control and
an accident.
Tiller handle models
1. Place the throttle grip in the fully closed
position.
2. Move the gear shift lever quickly and firmly from neutral to reverse.
Remote control models
Pull up the neutral interlock trigger (if
equipped) and move the remote control lever
quickly and firmly from neutral to reverse.
EMU30880
Trolling
EMU30890
Adjusting trolling speed
The trolling speed on outboard motors
equipped with the variable trolling RPM
switches can be adjusted approximately 50
r/min with each press of a switch.
1. “” switch
2. “” switch
To increase the trolling speed, press the “”
switch.
To decrease the trolling speed, press the “”
switch.
NOTE:
● The trolling speed changes approximately
50 r/min each time a switch is pressed.
36
Page 43
● If the trolling speed has been adjusted, the
engine returns to the normal trolling speed
when the engine is stopped and restarted
or when the engine speed exceeds approximately 3000 r/min.
EMU27820
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.
EMU27844
Procedure
1. Push and hold the engine stop button or
turn the main switch to “” (off).
Operation
2. After stopping the engine, disconnect the
fuel line if there is a fuel joint on the outboard motor.
3. Tighten the air vent screw on the fuel tank
cap (if equipped).
ZMU02041
4. Remove the key if the boat will be left unattended.
NOTE:
The engine can also be stopped by pulling the
lanyard and removing the lock plate from the
engine stop switch, then turning the main
switch to “” (off).
EMU27861
Trimming outboard motor
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,
37
Page 44
Operation
engine, and propeller. Correct trim is also affected by variables such as the load in the
boat, sea conditions, and running speed.
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.
EMU27882
Adjusting trim angle
Power trim and tilt models
EWM00751
WARNING
● Be sure all people are clear of the out-
board motor when adjusting the tilt angle, also be careful not to pinch any
body parts between the drive unit and
clamp bracket.
● Use caution when trying a trim position
for the first time. Increase speed gradually and watch for any signs of instability
or control problems. Improper trim angle can cause loss of control.
● If equipped with a power trim and tilt
switch located on the bottom cowling,
use the switch only when the boat is at a
complete stop with the engine off. Do
not adjust the trim angle with this switch
while the boat is moving.
Adjust the outboard motor trim angle using
the power trim and tilt switch.
1. Trim operating angle
38
1
ZMU04258
1. Power trim and tilt switch
Page 45
Operation
1. Power trim and tilt switch
UP
1
DN
ZMU04231
1. Power trim and tilt switch
To raise the bow (trim-out), press the switch
“” (up).
To lower the bow (trim-in), press the switch
“” (down).
Make test runs with the trim set to different 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.
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.
39
Page 46
Operation
NOTE:
Depending on the type of boat, the outboard
motor trim angle may have little effect on the
trim of the boat when operating.
EMU27933
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 casing from damage by collision with
obstructions, and also to reduce salt corrosion.
EWM00220
WARNING
Be sure all people are clear of the outboard motor when tilting up and down,
also be careful not to pinch any body parts
between the drive unit and engine bracket.
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
CAUTION:
● Before tilting the outboard motor, stop
the engine by following the procedure
on page 37. 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.
EMU28007
Procedure for tilting up (power trim
and tilt models / power tilt models)
1. Place the remote control lever / gear shift
lever in neutral.
N
ZMU03196
2. Disconnect the fuel line from the outboard motor or close the fuel cock.
3. Press the power trim and tilt switch / power tilt switch “” (up) until the outboard
motor has tilted up completely.
40
Page 47
UP
ZMU04232
4. Push the tilt support knob into the clamp
bracket or pull the tilt support lever toward
you to support the engine.
Operation
EWM00260
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 loses pressure.
5. Models equipped with trim rods: Once the
outboard motor is supported with the tilt
support lever, press the power trim and
tilt switch / power tilt switch “” (down) to
retract the trim rods.
ECM00250
CAUTION:
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.
EMU28055
Procedure for tilting down (power trim
and tilt models / power tilt models)
1. Push the power trim and tilt switch / power tilt switch “” (up) until the outboard
motor is supported by the tilt rod and the
tilt support lever / tilt support knob becomes free.
2. Release the tilt support lever or pull out
the tilt support knob.
41
Page 48
Operation
DN
ZMU04255
3. Push the power trim and tilt switch / power tilt switch “” (down) to lower the out-
board motor to the desired position.
UP
DN
DN
ZMU01936
EMU28060
Cruising in shallow water
The outboard motor can be tilted up partially
to allow operation in shallow water.
EMU28090
Power trim and tilt models / power tilt
models
The outboard motor can be tilted up partially
to allow operation in shallow water.
EWM00660
WARNING
● Place the gear shift in neutral before set-
ting up for shallow water cruising.
● Return the outboard motor to its normal
position as soon as the boat is back in
deeper water.
ECM00260
CAUTION:
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.
EMU28185
Procedure for power trim and tilt / power
tilt models
1. Place the remote control lever / gear shift
lever in neutral.
42
Page 49
2. Slightly tilt the outboard motor up to the
desired position using the power trim and
tilt switch / power tilt switch.
Operation
EMU28192
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 with salt deposits.
NOTE:
For cooling system flushing instructions, see
page 45.
Cruising in turbid water
Yamaha strongly recommends that you use
the optional chromium-plated water pump kit
(not available for some models) if you use the
outboard motor in turbid or muddy water conditions.
3. To return the outboard motor to the normal running position, press the power
trim and tilt switch / power tilt switch and
slowly tilt the outboard motor down.
43
Page 50
Maintenance
EMU31480
Specifications
NOTE:
“(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.
EMU28218
Dimension:
Overall length:
817 mm (32.2 in)
Overall width:
479 mm (18.9 in)
Overall height L:
1582 mm (62.3 in)
Overall height X:
1710 mm (67.3 in)
Transom height L:
536 mm (21.1 in)
Transom height X:
664 mm (26.1 in)
Weight (AL) L:
170.0 kg (375 lb)
Weight (AL) X:
174.0 kg (384 lb)
Weight (SUS) L:
172.0 kg (379 lb)
Weight (SUS) X:
176.0 kg (388 lb)
Performance:
Full throttle operating range:
5000–6000 r/min
Maximum output:
F100DET 73.6 kW@5500 r/min (100
HP@5500 r/min)
F80BET 58.8 kW@5500 r/min (80 HP@5500
r/min)
Idling speed (in neutral):
700 ±50 r/min
Engine:
Type:
4-stroke L
Displacement:
1596.0 cm³ (97.39 cu.in)
Bore × stroke:
79.0 × 81.4 mm (3.11 × 3.20 in)
Ignition system:
TCI
Spark plug (NGK):
LFR5A-11
Spark plug gap:
1.0–1.1 mm (0.039–0.043 in)
Control system:
Remote control
Starting system:
Electric
Starting carburetion system:
Electronic fuel injection
Valve clearance (cold engine) IN:
0.17–0.23 mm (0.0067–0.0091 in)
Valve clearance (cold engine) EX:
0.31–0.37 mm (0.0122–0.0146 in)
Min. cold cranking amps (CCA/EN):
430.0 A
Min. rated capacity (20HR/IEC):
70.0 Ah
Alternator output for battery DC:
25.0 A
Drive unit:
Gear positions:
Forward-neutral-reverse
Gear ratio:
2.31 (30/13)
Trim and tilt system:
Power trim and tilt
Propeller mark:
K
Fuel and oil:
Recommended fuel:
Regular unleaded gasoline
Min. research octane:
90
Fuel tank capacity:
25.0 L (6.61 US gal) (5.50 Imp.gal)
Recommended engine oil:
4-stroke outboard motor oil
Engine oil grade API:
API SE, SF, SG, SH, SJ, SL
Engine oil type SAE:
SAE10W30 or SAE10W40
Lubrication:
Wet sump
44
Page 51
Maintenance
Engine oil quantity (excluding oil filter):
4.3 L (4.55 US qt) (3.78 Imp.qt)
Recommended gear oil:
Hypoid gear oil SAE#90
Gear oil quantity:
670.0 cm³ (22.65 US oz) (23.63 Imp.oz)
Tightening torque for engine:
Spark plug:
25.0 Nm (18.4 ft-lb) (2.55 kgf-m)
Propeller nut:
35.0 Nm (25.8 ft-lb) (3.57 kgf-m)
Engine oil drain bolt:
28.0 Nm (20.7 ft-lb) (2.86 kgf-m)
Engine oil filter:
18.0 Nm (13.3 ft-lb) (1.84 kgf-m)
EMU28222
Transporting and storing out-
board motor
EWM00690
WARNING
● Leaking fuel is a fire hazard. When trans-
porting and storing the outboard motor,
close the air vent screw and fuel cock to
prevent fuel from leaking.
● 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.
EWM00700
WARNING
Never get under the lower unit while it is
tilted, even if a motor support bar is used.
Severe injury could occur if the outboard
motor accidentally falls.
ECM00660
CAUTION:
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.
EMU30041
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.
ECM01350
CAUTION:
● To prevent problems which can be
caused by oil entering the cylinder from
the sump, keep the outboard motor in
the attitude shown when transporting
and storing it. Do not store or transport
the outboard motor on its side (not upright).
● Do not place the outboard motor on its
side before the cooling water has
drained from it completely, otherwise
water may enter the cylinder through the
exhaust port and cause engine trouble.
● Store the outboard motor in a dry, well-
ventilated place, not in direct sunlight.
45
Page 52
Maintenance
● Drain the remaining gasoline from the
vapor separator. Gasoline left in the vapor separator for a prolonged period of
time will break down and could cause
damage to the fuel line.
ZMU03659
EMU28302
Procedure
EMU29953
Flushing with the flushing attachment
1. Wash the outboard motor body using
fresh water. For further information, see
page 49.
2. Disconnect the fuel line from the motor or
shut off the fuel cock, if equipped.
3. Remove the top cowling and propeller.
4. Install the flushing attachment over the
cooling water inlet.
ECM00300
CAUTION:
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
CAUTION:
Avoid running the outboard motor at high
speed while on the flushing attachment,
otherwise overheating could occur.
1. Flushing attachment
5. Cooling system flushing is essential to
prevent the cooling system from clogging
up with salt, sand, or dirt. In addition, fogging/lubricating the engine is mandatory
to prevent excessive engine damage due
to rust. Perform the flushing and fogging
at the same time.
EWM00090
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.
NOTE:
● When using the flushing attachment, main-
tain adequate water pressure and a steady
water flow.
● If the overheat warning device is activated,
turn the engine off, and consult your
Yamaha dealer.
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 the intake silencer or the fogging hole of the silencer cover, if equipped. When properly
done, the engine will smoke excessively
and almost stall.
46
Page 53
Maintenance
8. Drain the remained gasoline in the vapor
separator with a container. Loosen the
drain screw, and then remove the cap.
Push in the air valve with a screwdriver to
introduce air into the float chamber, so
that the gasoline will drain smoothly.
Then, tighten the drain screw.
1. Vapor separator
2. Drain screw
3. Cap
1. Air valve
9. Remove the flushing attachment.
10. Install the top cowling.
11. If “Fogging Oil” is not available, turn off
the engine after the 6 step. Then perform
the 8 step procedure.
12. Drain the cooling water completely out of
the motor. Clean the body thoroughly.
13. 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).
NOTE:
A flushing attachment is available from your
Yamaha dealer.
EMU28401
Lubrication
1. Grease the spark plug threads and install
the spark plug(s) and torque to proper
specification. For information on spark
plug installation, see page 52.
2. Change the gear oil. For instructions, see
page 58. Inspect the oil for the presence
of water that indicates a leaky seal. Seal
replacement should be performed by an
authorized Yamaha dealer prior to use.
3. Grease all grease fittings. For further details, see page 52.
EMU28430
Battery care
EWM00330
WARNING
Battery electrolytic fluid is dangerous; it
contains sulfuric acid and therefore is poisonous and highly caustic.
Always follow these preventive measures:
● Avoid bodily contact with electrolytic
fluid as it can cause severe burns or permanent eye injury.
● Wear protective eye gear when handling
or working near batteries.
Antidote (EXTERNAL):
● SKIN - Flush with water.
● EYES - Flush with water for 15 minutes
and get immediate medical attention.
Antidote (INTERNAL):
47
Page 54
Maintenance
● Drink large quantities of water or milk
followed by milk of magnesia, beaten
egg, or vegetable oil. Get immediate
medical attention.
Batteries also generate explosive hydrogen gas; therefore, you should always follow these preventive measures:
● Charge batteries in a well-ventilated ar-
ea.
● Keep batteries away from fire, sparks, or
open flames (for example: welding
equipment, lighted cigarettes, and so
on.)
● DO NOT SMOKE when charging or han-
dling batteries.
KEEP BATTERIES AND ELECTROLYTIC
FLUID OUT OF REACH OF CHILDREN.
Batteries vary among manufacturers. Therefore the following procedures may not always
apply. Consult your battery manufacturer’s instructions.
Procedure
1. Disconnect and remove the battery from
the boat. Always disconnect the black
negative cable first to prevent the risk of
shorting.
2. Clean the battery casing and terminals.
Fill each cell to the upper level with distilled water.
3. Store the battery on a level surface in a
cool, dry, well-ventilated place out of direct sunlight.
4. Once a month, check the specific gravity
of the electrolyte and recharge as required to prolong battery life.
EMU28442
Flushing power unit
Perform this procedure right after operation
for the most thorough flushing.
ECM01530
CAUTION:
Do not perform this procedure while the
engine is running. The water pump may be
damaged and severe damage from overheating can result.
1. After shutting off the engine, unscrew the
garden hose connector from the fitting on
the bottom cowling.
1. Fitting
2. Garden hose adapter
3. Garden hose connector
2. Screw the garden hose adapter onto a
garden hose, which is connected to a
fresh water supply, and then connect it to
the garden hose connector.
3. With the engine off, turn on the water tap
and let the water flush through the cooling passages for about 15 minutes. Turn
48
Page 55
Maintenance
off the water and disconnect the garden
hose adapter from the garden hose connector.
4. Reinstall the garden hose connector onto
the fitting on the bottom cowling. Tighten
the connector securely.
ECM00540
CAUTION:
Do not leave the garden hose connector
loose on the bottom cowling fitting or let
the hose hang free during normal operation. Water will leak out of the connector
instead of cooling the engine, which can
cause serious overheating. Be sure the
connector is tightened securely on the fitting after flushing the engine.
NOTE:
● When flushing the engine with the boat in
the water, tilting up the outboard motor until
it is completely out of the water will achieve
better results.
● For cooling system flushing instructions,
see page 45.
EMU28450
Cleaning the outboard motor
After use, wash the exterior of the outboard
motor with fresh water. Flush the cooling system with fresh water.
NOTE:
For cooling system flushing instructions, see
page 45.
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.
EMU28476
Periodic maintenance
EWM01070
WARNING
Be sure to turn off the engine when you
perform maintenance unless otherwise
specified. If you or the owner is not familiar with machine servicing, this work
should be done by your Yamaha dealer or
other qualified mechanic.
EMU28510
Replacement parts
If replacement parts are necessary, use only
genuine Yamaha parts or parts of the same
type and of equivalent strength and materials.
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.
ZMU04265
49
Page 56
Maintenance
EMU30563
Maintenance chart
NOTE:
● Refer to the sections in this chapter for explanations of each owner-specific action.
● The maintenance cycle on these charts assume usage of 200 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, turbid or muddy 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)
Battery Inspection / charging
Cooling water passages
Cowling clamp Inspection
Fuel filter (can be disassembled)
Fuel system Inspection
Fuel tank (Yamaha portable tank)
Gear oil Change
Greasing points Greasing
Idling speed Inspection
PCV (Pressure Control Valve)
Power trim and tilt unit Inspection
Propeller and cotter pin
Shift link / shift cable Inspection / adjustment
Inspection / replacement
Inspection / replacement
Cleaning
Inspection / cleaning
Inspection / cleaning
Inspection
Inspection / replacement
10 hours
(1 month)
50 hours
(3 months)
100 hours
(6 months)
200 hours
(1 year)
50
Page 57
Item Actions
Thermostat
Throttle link / throttle
cable / throttle pick-up
timing
Water pump
Engine oil Inspection / change
Oil filter (cartridge) Change
Spark plug(s)
Timing belt
EMU28874
Inspection / replacement
Inspection / adjustment
Inspection / replacement
Cleaning / adjustment /
replacement
Inspection / replacement
Maintenance chart (additional)
Item Actions
Timing belt Replacement
Valve clearance
(DOHC)
Fuel filter (vapor separator tank)
Anode(s) (exhaust cover, cover joint)
Exhaust guide, exhaust
manifold
EMU28910
Inspection / adjustment
Replacement
Replacement
Inspection / replacement
Maintenance
Initial Every
10 hours
(1 month)
500 hours (2.5 years) 1000 hours (5 years)
50 hours
(3 months)
Every
100 hours
(6 months)
200 hours
(1 year)
NOTE:
When using lead or high-sulfur gasoline, inspecting valve clearance may be required more frequently than every 500 hours.
51
Page 58
Maintenance
EMU28940
Greasing
Yamaha grease A (water resistant grease)
Yamaha grease D (corrosion resistant grease; for propeller shaft)
EMU28952
Cleaning and adjusting spark plug
EWM00560
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.
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 di-
52
ZMU04266
agnose any problems yourself. 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.
Standard spark plug:
LFR5A-11
Before fitting the spark plug, measure the
electrode gap with a wire thickness gauge;
adjust the gap to specification if necessary.
Page 59
1. Spark plug gap
2. Spark plug part number
3. Spark plug I.D. mark (NGK)
Spark plug gap:
1.0–1.1 mm (0.039–0.043 in)
When fitting the plug, always clean the gasket
surface and use a new gasket. Wipe off any
dirt from the threads and screw in the spark
plug to the correct torque.
Spark plug torque:
25.0 Nm (18.4 ft-lb) (2.55 kgf-m)
Maintenance
EWM00910
WARNING
Leaking fuel can result in fire or explosion.
● Check for fuel leakage regularly.
● If any fuel leakage is found, the fuel sys-
tem must be repaired by a qualified mechanic. Improper repairs can make the
outboard unsafe to operate.
Check the fuel lines for leaks, crack, or malfunction. If a problem is found, your Yamaha
dealer or other qualified mechanic should repair it immediately.
NOTE:
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 fingertight. Have the spark plug adjusted to the correct torque as soon as possible with a torquewrench.
EMU28962
Checking fuel system
EWM00060
WARNING
Gasoline and its vapors are highly flammable and explosive. Keep away from
sparks, cigarettes, flames, or other sources of ignition.
Checkpoints
● Fuel system parts leakage
● Fuel line joint leakage
● Fuel line cracks or other damage
● Fuel connector leakage
53
Page 60
Maintenance
EMU29073
Changing engine oil
EWM00760
WARNING
● Avoid draining the engine oil immediate-
ly after stopping the engine. The oil is
hot and should be handled with care to
avoid burns.
● Be sure the outboard motor is securely
fastened to the transom or a stable
stand.
ECM00970
CAUTION:
● Do not overfill the oil, and be sure the
outboard motor is upright (not tilted)
when checking and changing the engine
oil.
● If the oil level is above the upper level
mark, drain until the level meets the
specified capacity. Overfilling the oil
could cause leakage or damage.
ECM01240
CAUTION:
Change the engine oil after the first 10
hours of operation, and every 100 hours or
at 6-month intervals thereafter. Otherwise
the engine will wear quickly.
NOTE:
Change the engine oil when the oil is still
warm.
1. Put the outboard motor in an upright position (not tilted).
ZMU04270
2. Prepare a suitable container that holds a
larger amount than the engine oil capacity. Loosen and remove the drain screw
while holding the container under the
drain hole. Then remove the oil filler cap.
Let the oil drain completely. Wipe up any
spilled oil immediately.
1
ZMU04241
1. Drain screw
3. Put a new gasket on the oil drain screw.
Apply a light coat of oil to the gasket and
install the drain screw.
Drain screw tightening torque:
28.0 Nm (20.7 ft-lb) (2.86 kgf-m)
54
NOTE:
If a torque wrench is not available when you
are installing the drain screw, finger tighten
the screw just until the gasket comes into contact with the surface of the drain hole. Then
Page 61
tighten 1/4 to 1/2 turn more. Tighten the drain
screw to the correct torque with a torque
wrench as soon as possible.
4. Add the correct amount of oil through the
filler hole. Install the filler cap.
Recommended engine oil:
4-stroke outboard motor oil
Engine oil quantity (excluding oil filter):
4.3 L (4.55 US qt) (3.78 Imp.qt)
1
ZMU04271
1. Oil filler cap
5. Start the engine and watch to make sure
the low oil pressure warning indicator (if
equipped) turns off. Make sure that there
are no oil leaks.
ECM00680
CAUTION:
If the low oil pressure warning indicator
does not turn off or if there are oil leaks,
stop the engine and find the cause. Continued operation with a problem could
cause severe engine damage. Consult
your Yamaha dealer if the problem cannot
be located and corrected.
Maintenance
1. Lower level mark
2. Oil dipstick
3. Upper level mark
7. Dispose of used oil according to local
regulations.
NOTE:
● For more information on the disposal of
used oil, consult your Yamaha dealer.
● Change the oil more often when operating
the engine under adverse conditions such
as extended trolling.
EMU29112
Checking wiring and connectors
● Check that each grounding wire is properly
secured.
● Check that each connector is engaged se-
curely.
6. Turn off the engine and wait 3 minutes.
Recheck the oil level using the dipstick to
be sure the level falls between the upper
and lower marks. Fill with oil if it is below
the lower mark, or drain to the specified
level if it is above the upper mark.
ZMU04243
55
Page 62
Maintenance
EMU29120
Exhaust leakage
Start the engine and check that no exhaust
leaks from the joints between the exhaust
cover, cylinder head, and body cylinder.
EMU29130
Water leakage
Start the engine and check that no water
leaks from the joints between the exhaust
cover, cylinder head, and body cylinder.
EMU29140
Engine oil leakage
Check for oil leaks on the around the engine.
NOTE:
If any leaks are found, consult your Yamaha
dealer.
EMU29163
Checking power trim and tilt / power
tilt system
EWM00430
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.
● Make sure no one is under the outboard
motor before performing this test.
1. Check the power trim and tilt unit / power
tilt unit for any sign of oil leaks.
1
2. Operate each of the power trim and tilt
switches / power tilt switches to check
that all switches work.
3. Tilt the outboard motor up and check that
the trim and tilt rod / the tilt rod is pushed
out completely.
4. Check that the trim and tilt rod / the tilt rod
is free of corrosion or other flaws.
5. Tilt the outboard motor down. Check that
the trim and tilt rod / the tilt rod operates
smoothly.
NOTE:
Consult your Yamaha dealer if any operation
is abnormal.
EMU29171
Checking propeller
EWM00321
WARNING
You could be seriously injured if the engine accidentally starts when you are near
the propeller.
● Before inspecting, removing, or install-
ing the propeller, remove the spark plug
caps from the spark plugs. Also, place
the shift control in neutral, turn the main
switch to “” (off) and remove the key,
and remove the lanyard from the engine
stop switch. Turn off the battery cut-off
switch if your boat has one.
● Do not use your hand to hold the propel-
ler when loosening or tightening the
propeller nut. Put a wood block between
the anti-cavitation plate and the propeller to prevent the propeller from turning.
1. Tilt rod
56
ZMU04244
Page 63
ZMU04262
Maintenance
NOTE:
If the shear pin equipped: it is designed to
break if the propeller hits a hard underwater
obstacle to help protect the propeller and
drive mechanism. The propeller will then spin
freely on the shaft. If this happens, the shear
pin must be replaced.
EMU30660
Removing the propeller
EMU29194
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).
1
3
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 / shear pin for wear or
damage.
● Check for fish line tangled around the pro-
peller shaft.
● Check the propeller shaft oil seal for dam-
age.
6
2
4
5
ZMU03228
1. Cotter pin
2. Propeller nut
3. Washer
4. Spacer
5. Propeller
6. Thrust washer
3. Remove the propeller and thrust washer.
EMU30670
Installing the Propeller
EMU29231
Spline models
ECM00340
CAUTION:
● Be sure to install the thrust washer be-
fore installing the propeller, otherwise
the lower case and propeller boss could
be damaged.
57
Page 64
Maintenance
● 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, and propeller on the propeller
shaft.
3. Install the spacer (if equipped) and the
washer. Tighten the propeller nut to the
specified torque.
4. Align the propeller nut with the propeller
shaft hole. Insert a new cotter pin in the
hole and bend the cotter pin ends.
● Never get under the lower unit while it is
tilted, even when the tilt support lever or
knob is locked. Severe injury could occur if the outboard motor accidentally
falls.
1. Tilt the outboard motor so that the gear oil
drain screw is at the lowest point possible.
2. Place a suitable container under the gear
case.
3. Remove the gear oil drain screw and gasket.
2
1
ZMU03273
1. Gear oil drain screw
2. Oil level plug
ZMU02063
NOTE:
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.
EMU29282
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.
58
NOTE:
● 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.
ECM00710
CAUTION:
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.
Page 65
Maintenance
NOTE:
For disposal of used oil, consult your Yamaha
dealer.
5. With the outboard motor in a vertical position, and using a flexible or pressurized
filling device, inject the gear oil into the
gear oil drain screw hole.
Recommended gear oil:
Hypoid gear oil SAE#90
Gear oil quantity:
670.0 cm³ (22.65 US oz) (23.63
Imp.oz)
ZMU03274
6. Put a new gasket on the oil level plug.
When the oil begins to flow out of the oil
level plug hole, insert and tighten the oil
level plug.
7. Put a new gasket on the gear oil drain
screw. Insert and tighten the gear oil
drain screw.
EMU29302
Cleaning fuel tank
EWM00920
WARNING
Gasoline is highly flammable, and its vapors are flammable and explosive.
● If you have any question about properly
doing this procedure, consult your
Yamaha dealer.
● Keep away from sparks, cigarettes,
flames, or other sources of ignition
when cleaning the fuel tank.
● Remove the fuel tank from the boat be-
fore cleaning it. Work only outdoors in
an area with good ventilation.
● Wipe up any spilled fuel immediately.
● Reassemble the fuel tank carefully. Im-
proper assembly can result in a fuel
leak, which could result in a fire or explosion hazard.
● Dispose of old gasoline according to lo-
cal regulations.
1. Empty the fuel tank into an approved container.
2. Pour a small amount of suitable solvent
into the tank. Install the cap and shake
the tank. Drain the solvent completely.
3. Remove the screws holding the fuel joint
assembly. Pull the assembly out of the
tank.
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.
59
Page 66
Maintenance
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
CAUTION:
Do not paint anodes, as this would render
them ineffective.
NOTE:
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.
ZMU04245
EMU29320
Checking battery (for electric start
models)
EWM00330
WARNING
Battery electrolytic fluid is dangerous; it
contains sulfuric acid and therefore is poisonous and highly caustic.
Always follow these preventive measures:
● Avoid bodily contact with electrolytic
fluid as it can cause severe burns or permanent eye injury.
● Wear protective eye gear when handling
or working near batteries.
Antidote (EXTERNAL):
● SKIN - Flush with water.
● EYES - Flush with water for 15 minutes
and get immediate medical attention.
Antidote (INTERNAL):
● Drink large quantities of water or milk
followed by milk of magnesia, beaten
egg, or vegetable oil. Get immediate
medical attention.
Batteries also generate explosive hydrogen gas; therefore, you should always follow these preventive measures:
● Charge batteries in a well-ventilated ar-
ea.
● Keep batteries away from fire, sparks, or
open flames (for example: welding
equipment, lighted cigarettes, and so
on.)
● DO NOT SMOKE when charging or han-
dling batteries.
KEEP BATTERIES AND ELECTROLYTIC
FLUID OUT OF REACH OF CHILDREN.
ECM00360
CAUTION:
● A poorly maintained battery will quickly
deteriorate.
60
Page 67
Maintenance
● Ordinary tap water contains minerals
harmful to a battery, and should not be
used for topping up.
1. Check the electrolyte level at least once a
month. Fill to the manufacturer’s recommended level when necessary. Top up
only with distilled water (or pure de-ionized water suitable to use in batteries).
2. Always keep the battery in a good state of
charge. Installing a voltmeter will help
you monitor your battery. If you will not
use the boat for a month or more, remove
the battery from the boat and store it in a
cool, dark place. Completely recharge
the battery before using it.
3. If the battery will be stored for longer than
a month, check the specific gravity of the
fluid at least once a month and recharge
the battery when it is low.
NOTE:
Consult a Yamaha dealer when charging or
re-charging batteries.
EMU29331
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.
ECM01121
CAUTION:
● Make sure the main switch (on applica-
ble models) is “” (off) before working
on the battery.
● Reversal of the battery cables will dam-
age the electrical parts.
● Connect the red battery cable first when
installing the battery and disconnect the
black battery cable first when removing
it. Otherwise, the electrical parts can be
damaged.
● The electrical contacts of the battery
and cables must be clean and properly
connected, or the battery will not start
the engine.
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
EMU29370
Disconnecting the battery
Disconnect the BLACK cable from the NEGATIVE (-) terminal first. Then disconnect the
RED cable from the POSITIVE (+) terminal.
EMU29390
Checking top cowling
Check the fitting of the top cowling by pushing
it with both hands. If it is loose have it repaired
by your Yamaha dealer.
61
Page 68
Maintenance
EMU29400
Coating the boat bottom
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.
62
ZMU04246
Page 69
Trouble Recovery
EMU29424
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 warning 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 filter clogged?
A. Clean or replace filter.
Q. Is starting procedure incorrect?
A. See page 32.
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 stop switch lanyard not attached?
A. Attach lanyard.
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.
Q. Is fuel contaminated or stale?
A. Fill tank with clean, fresh fuel.
Q. Is fuel system obstructed?
63
Page 70
Trouble Recovery
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 warning system activated?
A. Find and correct cause of warning.
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.
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?
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.
Warning 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 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.
64
Page 71
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.
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 warning system activated?
A. Find and correct cause of warning.
Q. Is boat bottom fouled with marine growth?
A. Clean boat bottom.
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
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 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. Is air vent screw closed?
A. Open the air vent screw.
Q. Is fuel pump damaged?
A. Have serviced by a Yamaha dealer.
Q. Is fuel joint connection incorrect?
65
Page 72
Trouble Recovery
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.
EMU29471
Replacing fuse
If a fuse has blown, remove the electrical cover, open the fuse holder and remove the fuse
with a fuse puller (if equipped). Replace it with
a spare one of the proper amperage.
EWM00630
WARNING
Be sure to use the specified fuse. An incorrect fuse or a piece of wire could allow
excessive current flow. This could cause
electric system damage and a fire hazard.
NOTE:
Consult your Yamaha dealer if the new fuse
immediately blows again.
66
Page 73
Trouble Recovery
1. Electrical cover
2. Fuse puller
3. Fuse holder
4. Starter relay fuse (30 A)
5. Rectifier Regulator (Main) fuse (20 A)
6. Main switch / trim switch fuse (20 A)
7. Engine control unit / ignition coil / electric
fuel pump / fuel injector / ISC (idle speed
control) fuse (20 A)
8. Spare fuse (20 A, 30 A)
EMU29522
Power trim and tilt / power tilt will not
operate
If the engine cannot be tilted up or down with
the power trim and tilt / the power tilt because
of a discharged battery or a failure with the
power trim and tilt unit / the power tilt unit, the
engine can be tilted manually.
1. Loosen the manual valve screw by turning it counterclockwise until it stops.
1
1. Manual valve screw
ZMU04249
2. Put the engine in the desired position,
then tighten the manual valve screw by
turning it clockwise.
EMU31601
Water separator warning indicator
blinks while cruising
EWM01500
WARNING
Gasoline is highly flammable, and its vapors are flammable and explosive.
● Do not perform this procedure on a hot
or running engine. Allow the engine to
cool.
● There will be fuel in the fuel filter. Keep
away from sparks, cigarettes, flames or
other sources of ignition.
● This procedure will allow some fuel to
spill. Catch fuel in a rag. Wipe up any
spilled fuel immediately.
● The fuel filter must be reassembled
carefully with the O-ring, filter cup, and
hoses in place. Improper assembly or
replacement could result in a fuel leak,
which could result in a fire or explosion
hazard.
If the water separator warning indicator on the
tachometer blinks, perform the following procedure.
67
Page 74
Trouble Recovery
1. Water separator warning indicator
1. Stop the engine.
2. Remove the top cowling.
3. Remove the plastic tie.
1. Water detection switch coupler
5. Unscrew the filter cup from the filter housing.
NOTE:
Be careful not to twist the water detection
switch lead when unscrewing the filter cup.
1. Plastic tie
4. Disconnect the water detection switch
coupler.
ECM01570
CAUTION:
Be careful not to get any water on the water detection switch coupler, otherwise a
malfunction could occur.
68
1. Filter cup
2. Water detection switch lead
6. Drain the water in the filter cup by soaking
it up with a rag.
Page 75
Trouble Recovery
NOTE:
Properly dispose of the rag.
7. Firmly screw the filter cup onto the filter
housing.
NOTE:
Be careful not to twist the water detection
switch lead when screwing the filter cup onto
the filter housing.
8. Connect the water detection switch coupler securely until a click is heard.
1. Water detection switch coupler
9. Fasten the water detection switch lead
with the plastic tie.
1. Plastic tie
10. Install the top cowling.
11. Start the engine and make sure that the
water separator warning indicator remains off.
NOTE:
Have a Yamaha dealer inspect the outboard
motor after returning to port.
EMU29541
Starter will not operate
If the starter mechanism does not operate
(the engine cannot be cranked with the starter), the engine can be started manually with
an emergency starter rope. However, the engine cannot be started manually if the battery
voltage is low. If the battery is discharged to 9
volts or below, the electric fuel pump will not
operate.
EWM01021
WARNING
● Use this procedure only in an emergen-
cy 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 stop switch lanyard to
a secure place on your clothing, or your
arm or leg while operating the boat.
● Do not attach the lanyard to clothing
that could tear loose. Do not route the
cord where it could become entangled,
preventing it from functioning.
● Avoid accidentally pulling the lanyard
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.
69
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Trouble Recovery
● Make sure no one is standing behind
you when pulling the starter rope. It
could whip behind you and injure someone.
● An unguarded, rotating flywheel is very
dangerous. Keep loose clothing and
other objects away when starting the engine. Use the emergency starter rope
only as instructed. Do not touch the flywheel or other moving parts when the
engine is running. Do not install the
starter mechanism or top cowling after
the engine is running.
● Do not touch the ignition coil, spark plug
wire, spark plug cap, or other electrical
components when starting or operating
the motor. You could get an electrical
shock.
EMU30650
Emergency starting engine
1. Remove the top cowling.
2. Lift up the rear of flywheel cover and pull
it forward to remove it.
ZMU02334
4. Insert the knotted end of the emergency
starter rope into the notch in the flywheel
rotor and wind the rope around the flywheel clockwise.
5. Pull the rope slowly until resistance is felt.
6. Remove the rope from the flywheel temporarily.
7. Rewind the rope around the flywheel approximately 3/4 of a turn clockwise.
8. Give a strong pull straight out to crank
and start the engine. Repeat if necessary.
3. Prepare the engine for starting. For further information, see page 32. Be sure
the engine is in neutral and that the engine stop switch lanyard lock plate is attached to the engine stop switch. The
main switch must be “” (on).
70
Page 77
ZMU04272
EMU29760
Treatment of submerged motor
If the outboard motor is submerged, immediately take it to a Yamaha dealer. Otherwise
some corrosion may begin almost immediately.
If you cannot immediately take the outboard
motor to a Yamaha dealer, follow the procedure below in order to minimize engine damage.
EMU29790
Procedure
1. Thoroughly wash away mud, salt, seaweed, and so on, with fresh water.
2. Remove the spark plugs and face the
spark plug holes downward to allow any
water, mud, or contaminants to drain.
3. Drain the fuel from the vapor separator,
fuel filter, and fuel line.
4. Feed fogging oil or engine oil through the
intake manifold and spark plug holes
while cranking with the emergency starter
rope.
5. Take the outboard motor to a Yamaha
dealer as soon as possible.
ECM00400
CAUTION:
Do not attempt to run the outboard motor
until it has been completely inspected.
Trouble Recovery
71
Page 78
YAMAHA MOTOR CO., LTD.
Printed in Japan
March 2006–1.1 × 1 CR
Printed on recycled paper
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