Yamaha F8F User manual

Read this manual carefully before operating this
outboard motor.
OWNER’S MANUAL
F6D
F8F
FT8G
6FW-28199-76-E0
U6FW76E0.book Page 1 Tuesday, November 23, 2021 7:37 AM

Read this manual carefully before operating this outboard motor. Keep this
manual onboard in a waterproof bag when boating. This manual should stay
with the outboard motor if it is sold.
U6FW76E0.book Page 1 Tuesday, November 23, 2021 7:37 AM

Important manual information
EMU25108
To the owner
Thank you for selecting a Yamaha outboard
motor. This Owner’s Manual contains infor-
mation needed for proper operation, mainte-
nance and care. A thorough understanding of
these simple instructions will help you obtain
maximum enjoyment from your new Yamaha.
If you have any question about the operation
or maintenance of your outboard motor,
please consult a Yamaha dealer.
In this Owner’s Manual particularly important
information is distinguished in the following
ways.
: This is the safety alert symbol. It is used
to alert you to potential personal injury haz-
ards. Obey all safety messages that follow
this symbol to avoid possible injury or death.
EWM00782
A WARNING indicates a hazardous situa-
tion which, if not avoided, could result in
death or serious injury.
ECM00702
A NOTICE indicates special precautions
that must be taken to avoid damage to the
outboard motor or other property.
TIP:
A TIP provides key information to make pro-
cedures easier or clearer.
Yamaha continually seeks advancements in
product design and quality. Therefore, while
this manual contains the most current prod-
uct information available at the time of print-
ing, there may be minor discrepancies
between your machine and this manual. If
there is any question concerning this manual,
please consult your Yamaha dealer.
To ensure long product life, Yamaha recom-
mends that you use the product and perform
the specified periodic inspections and main-
tenance by correctly following the instruc-
tions in the owner’s manual. Any damage
resulting from neglect of these instructions is
not covered by warranty.
Some countries have laws or regulations re-
stricting 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 war-
ranty may not apply in certain regions. When
planning to take the product to another coun-
try, consult the dealer where the product was
purchased for further information.
If the product was purchased used, please
consult your closest dealer for customer re-
registration, and to be eligible for the speci-
fied services.
TIP:
The F6DMH, F6DM, F8FMH, F8FE, FT8GMH,
FT8GE, FT8GEP and the standard accesso-
ries are used as a base for the explanations
and illustrations in this manual. Therefore
some items may not apply to every model.
EMU25123
F6D, F8F, FT8G
OWNER’S MANUAL
©2022 by Yamaha Motor Co., Ltd.
1st Edition, October 2021
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Co., Ltd.
is expressly prohibited.
Printed in Japan
U6FW76E0.book Page 1 Tuesday, November 23, 2021 7:37 AM

Table of contents
Safety information............................. 1
Outboard motor safety.................... 1
Propeller ............................................. 1
Rotating parts..................................... 1
Hot parts ............................................ 1
Electric shock..................................... 1
Power tilt ............................................ 1
Engine shut-off cord (lanyard)............ 1
Gasoline ............................................. 2
Gasoline exposure and spills ............. 2
Carbon monoxide .............................. 2
Modifications...................................... 2
Boating safety ................................. 2
Alcohol and drugs .............................. 2
Personal flotation devices (PFDs) ...... 2
People in the water ............................ 2
Passengers......................................... 2
Overloading........................................ 3
Avoid collisions .................................. 3
Collisions with floating or submerged
objects ............................................ 3
Weather.............................................. 4
Passenger training ............................. 4
Boating safety publications................ 4
Laws and regulations ......................... 4
General information .......................... 5
Identification numbers record ......... 5
Outboard motor serial number........... 5
Key number........................................ 5
EC Declaration of Conformity
(DoC) ............................................ 5
CE Marking / UKCA Marking .......... 6
Read manuals and labels................ 7
Warning labels ................................... 7
Specifications and requirements... 11
Specifications................................ 11
Installation requirements............... 12
Boat horsepower rating.................... 12
Mounting outboard motor ................ 13
Remote control requirements ....... 13
Battery requirements .................... 13
Battery specifications....................... 13
To use the battery ............................ 13
Propeller selection ........................ 14
Start-in-gear protection ................ 14
Engine oil requirements ................ 14
Fuel requirements ......................... 15
Gasoline ........................................... 15
Muddy or acidic water .................. 16
Anti-fouling paint .......................... 16
Outboard motor disposal
requirements.............................. 16
Emergency equipment.................. 16
Components.................................... 17
Components diagram ................... 17
Fuel tank........................................... 19
Fuel joint........................................... 20
Fuel tank cap.................................... 20
Air vent screw................................... 20
Remote control box.......................... 20
Remote control lever ........................ 20
Neutral interlock trigger.................... 21
Neutral throttle lever......................... 21
Choke switch.................................... 21
Tiller handle ..................................... 21
Gear shift lever ................................ 21
Throttle grip ..................................... 22
Throttle indicator ............................. 22
Throttle friction adjuster ................... 22
Engine shut-off cord (lanyard) and
clip ................................................ 23
Engine stop button .......................... 23
Pull-type choke knob ....................... 24
Manual starter handle....................... 24
Main switch ...................................... 24
Power tilt switch ............................... 24
Steering friction adjuster .................. 25
Trim rod (tilt pin) ............................... 25
Tilt lock mechanism ......................... 26
Tilt support knob .............................. 26
Tilt support bar ................................. 26
Power tilt unit ................................... 26
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Table of contents
Cowling lock lever ............................ 27
Flushing device ................................ 27
Alert indicator .................................. 27
Instruments and indicators ............ 28
Indicators ..................................... 28
Low oil pressure-alert indicator........ 28
Engine control system .................... 29
Alert system .................................. 29
Low oil pressure alert....................... 29
Installation ....................................... 30
Installation ..................................... 30
Mounting the outboard motor.......... 30
Clamping the outboard motor.......... 32
Operation ......................................... 33
First-time operation....................... 33
Fill engine oil .................................... 33
Breaking in engine............................ 33
Getting to know your boat ............... 33
Checks before starting engine ...... 34
Fuel level .......................................... 34
Removing top cowling ..................... 34
Fuel system ...................................... 34
Controls............................................ 34
Engine shut-off cord (lanyard).......... 35
Engine oil.......................................... 35
Outboard motor ............................... 35
Flushing device ................................ 36
Install top cowling ............................ 36
Checking power tilt system.............. 37
Battery.............................................. 37
Filling fuel ..................................... 37
Operating engine........................... 38
Sending fuel (portable tank) ............. 38
Starting engine ................................. 39
Checks after starting engine ......... 45
Cooling water ................................... 45
Warming up engine ....................... 46
Manual start and electric start
models .......................................... 46
Checks after engine warm up....... 46
Shifting ............................................. 46
Stop switches................................... 46
Shifting.......................................... 46
Stopping boat ............................... 48
Stopping engine............................ 48
Procedure......................................... 48
Procedure......................................... 49
Trimming outboard motor............. 49
Adjusting trim angle for manual tilt
models .......................................... 50
Adjusting trim angle (power tilt
models) ......................................... 50
Adjusting boat trim ........................... 51
Tilting up and down ...................... 52
Procedure for tilting up (manual tilt
models) ......................................... 52
Procedure for tilting up (power tilt
models) ......................................... 53
Procedure for tilting down (manual
tilt models) .................................... 54
Procedure for tilting down (power
tilt models) .................................... 54
Shallow water .............................. 55
Cruising in shallow water (manual
tilt models) .................................... 55
Power tilt models.............................. 56
Cruising in other conditions.......... 57
Maintenance.................................... 58
Transporting and storing
outboard motor.......................... 58
Dismounting the outboard motor ..... 58
Storing outboard motor.................... 60
Procedure......................................... 60
Lubrication ....................................... 62
Flushing power unit .......................... 62
Cleaning the outboard motor ........... 63
Checking painted surface of
outboard motor............................. 63
Periodic maintenance ................... 63
Replacement parts ........................... 63
Severe operating conditions ............ 64
Maintenance chart 1......................... 65
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Table of contents
Maintenance chart 2 ........................ 67
Greasing........................................... 68
Cleaning and adjusting spark plug... 69
Checking fuel filter ........................... 70
Inspecting idle speed ....................... 70
Changing engine oil.......................... 70
Why Yamalube ................................. 72
Inspecting wiring and connectors .... 73
Checking propeller ........................... 73
Removing propeller .......................... 73
Installing propeller............................ 74
Changing gear oil ............................. 76
Inspecting and replacing anode(s) ... 77
Checking battery (for electric start
models) ......................................... 78
Connecting the battery..................... 78
Disconnecting the battery ................ 79
Trouble Recovery ............................ 80
Troubleshooting ............................ 80
Temporary action in emergency ... 83
Impact damage ................................ 83
Replacing fuse ................................. 83
Power tilt will not operate................. 84
Starter will not operate..................... 84
Emergency starting engine .............. 85
Engine fails to operate .................. 86
Emergency engine operation ........... 86
Treatment of submerged motor .... 86
INDEX ............................................... 88
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1
Safety information
EMU33623
Outboard motor safety
Observe these precautions at all times.
EMU36502
Propeller
People can be injured or killed if they come in
contact with the propeller. The propeller can
keep moving even when the motor is in neu-
tral, and sharp edges of the propeller can cut
even when stationary.
Stop the engine when a person is in the
water near you.
Keep people out of reach of the propeller,
even when the engine is off.
EMU40272
Rotating parts
Hands, feet, hair, jewelry, clothing, personal
flotation device (PFD) straps, etc., can be-
come entangled with internal rotating parts of
the engine, resulting in serious injury or
death.
Keep the top cowling in place whenever pos-
sible. Do not remove or replace the top cowl-
ing with the engine running.
Only operate the engine with the top cowling
removed according to the specific instruc-
tions in the manual. Keep hands, feet, hair,
jewelry, clothing, PFD straps, etc., away from
any exposed moving parts.
EMU33641
Hot parts
During and after operation, engine parts are
hot enough to cause burns. Avoid touching
any parts under the top cowling until the en-
gine has cooled.
EMU33651
Electric shock
Do not touch any electrical parts while start-
ing or operating the engine. They can cause
shock or electrocution.
EMU34791
Power tilt
Body parts can be crushed between the mo-
tor and the clamp bracket when the motor is
trimmed or tilted. Keep body parts out of this
area at all times. Be sure no one is in this area
before operating the power tilt mechanism.
The power tilt switches operate even when
the main switch is off. Keep people be away
from the switches whenever working around
the motor.
Never get under the lower unit while it is tilted,
even when the tilt support lever or knob is
locked. Severe injury could occur if the out-
board motor accidentally falls.
EMU33672
Engine shut-off cord (lanyard)
Attach the engine shut-off cord so that the
engine stops if the operator falls overboard or
leaves the helm. This prevents the boat from
running away under power and leaving peo-
ple stranded, or running over people or ob-
jects.
Always attach the engine shut-off cord to a
secure place on your clothing or your arm or
leg while operating. Do not remove it to leave
the helm while the boat is moving. Do not at-
tach the cord to clothing that could tear
loose, or route the cord where it could be-
come entangled, preventing it from function-
ing.
Do not route the cord where it is likely to be
accidentally pulled out. If the cord is pulled
during operation, the engine will shut off and
you will lose most steering control. The boat
could slow rapidly, throwing people and ob-
jects forward.
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Safety information
2
EMU33811
Gasoline
Gasoline and its vapors are highly flamma-
ble and explosive. Always, refuel according
to the procedure on page 38 to reduce the
risk of fire and explosion.
EMU33821
Gasoline exposure and spills
Take care not to spill gasoline. If gasoline
spills, wipe it up immediately with dry rags.
Dispose of rags properly.
If any gasoline spills onto your skin, immedi-
ately wash with soap and water. Change
clothing if gasoline spills on it.
If you swallow gasoline, inhale a lot of gaso-
line vapor, or get gasoline in your eyes, get
immediate medical attention. Never siphon
fuel by mouth.
EMU33901
Carbon monoxide
This product emits exhaust gases which con-
tain 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.
EMU33781
Modifications
Do not attempt to modify this outboard mo-
tor. Modifications to your outboard motor
may reduce safety and reliability, and render
the outboard unsafe or illegal to use.
EMU33742
Boating safety
This section includes a few of the many im-
portant safety precautions that you should
follow when boating.
EMU33711
Alcohol and drugs
Never operate after drinking alcohol or taking
drugs. Intoxication is one of the most com-
mon factors contributing to boating fatalities.
EMU40281
Personal flotation devices (PFDs)
Have an approved PFD on board for every
occupant. Yamaha recommends that you
must wear a PFD whenever boating. At a
minimum, children and non-swimmers
should always wear PFDs, and everyone
should wear PFDs when there are potentially
hazardous boating conditions.
EMU33732
People in the water
Always watch carefully for people in the wa-
ter, such as swimmers, skiers, or divers,
whenever the engine is running. When some-
one is in the water near the boat, shift into
neutral and stop the engine.
Stay away from swimming areas. Swimmers
can be hard to see.
The propeller can keep moving even when
the motor is in neutral. Stop the engine when
a person is in the water near you.
EMU33752
Passengers
Consult your boat manufacturer’s instruc-
tions for details about appropriate passenger
locations in your boat and be sure all passen-
gers are positioned properly before acceler-
ating and when operating above an idle
speed. Standing or sitting in non-designated
locations may result in being thrown either
overboard or within the boat due to waves,
wakes, or sudden changes in speed or direc-
tion. Even when people are positioned prop-
U6FW76E0.book Page 2 Tuesday, November 23, 2021 7:37 AM

Safety information
3
erly, alert your passengers if you must make
any unusual maneuver. Always avoid jump-
ing waves or wakes.
EMU33763
Overloading
Do not overload the boat. Consult the boat
capacity plate or boat manufacturer for max-
imum weight and number of passengers. Be
sure that weight is properly distributed ac-
cording to the boat manufacturer’s instruc-
tions. Overloading or incorrect weight
distribution can compromise the boat’s han-
dling and lead to an accident, capsizing or
swamping.
EMU33773
Avoid collisions
Scan constantly for people, objects, and oth-
er boats. Be alert for conditions that limit your
visibility or block your vision of others.
Operate defensively at safe speeds and keep
a safe distance away from people, objects,
and other boats.
Do not follow directly behind other boats or
waterskiers.
Avoid sharp turns or other maneuvers that
make it hard for others to avoid you or un-
derstand where you are going.
Avoid areas with submerged objects or
shallow water.
Ride within your limits and avoid aggres-
sive maneuvers to reduce the risk of loss of
control, ejection, and collision.
Take early action to avoid collisions. Re-
member, boats do not have brakes, and
stopping the engine or reducing throttle
can reduce the ability to steer. If you are not
sure that you can stop in time before hitting
an obstacle, apply throttle and turn in an-
other direction.
EMU48100
Collisions with floating or submerged
objects
If the outboard motor hits a floating object or
an obstacle in the water while cruising, the
following could occur:
The passengers and any loose equipment
or luggage could be thrown forward due to
the sudden deceleration.
Parts of the outboard motor could come
loose as a result of the impact and could be
thrown into the boat.
The boat or outboard motor could be dam-
aged as a result of the impact.
When you operate the boat in an area where
there might be floating objects or obstacles in
the water, be sure to adjust the trim angle of
the outboard motor, slow down, and operate
carefully. For further information, see page
55.
If the outboard motor hits a floating object or
an obstacle in the water, make sure that there
are no abnormalities with the boat and the
outboard motor. If anything abnormal is
found, return to the nearest harbor at low
speed and have a Yamaha dealer inspect the
outboard motor.
ZMU06025
U6FW76E0.book Page 3 Tuesday, November 23, 2021 7:37 AM

Safety information
4
EMU33791
Weather
Stay informed about the weather. Check
weather forecasts before boating. Avoid
boating in hazardous weather.
EMU33881
Passenger training
Make sure at least one other passenger is
trained to operate the boat in the event of an
emergency.
EMU33891
Boating safety publications
Be informed about boating safety. Additional
publications and information can be obtained
from many boating organizations.
EMU33602
Laws and regulations
Know the marine laws and regulations where
you will be boating—and obey them. Several
sets of rules prevail according to geographic
location, but all are basically the same as the
International Rules of the Road.
U6FW76E0.book Page 4 Tuesday, November 23, 2021 7:37 AM

General information
5
EMU25172
Identification numbers record
EMU25186
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 sto-
len.
EMU25192
Key number
If a main key switch is equipped with the mo-
tor, the key identification number is stamped
on your key as shown in the illustration. Re-
cord this number in the space provided for
reference in case you need a new key.
EMU38984
EC Declaration of Conformity
(DoC)
This declaration is included with outboard
motors that conform to European regula-
tions.
1. Outboard motor serial number location
1. Outboard motor serial number location
ZMU05335
1
ZMU05336
1
1. Serial number
2. Model name
3. Motor transom height
4. Engine code
1. Key number
3412
ZMU01692
1
ZMU01694
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General information
6
This outboard motor conforms to certain por-
tions of the European Parliament directive re-
lating to machinery.
Each conformed outboard motor accompa-
nied with EC DoC. EC DoC contains the fol-
lowing information;
Manufacturer
Model name
Engine code
Applied directives
EMU48442
CE Marking / UKCA Marking
This label is affixed to outboard motors that
conform to European regulations.
CE marking
Outboard motors affixed with this “CE” mark-
ing conform with the directives of;
2006/42/EC, 2014/30/EU, and 2013/53/EU.
UKCA marking
This product is in compliance with the Recre-
ational Craft Regulations 2017, Electromag-
netic Compatibility Regulations 2016 and
Supply of Machinery (Safety) Regulations
2008.
1. CE marking location
1. CE marking location
1
1
6EE-43394-90
15210026
U6FW76E0.book Page 6 Tuesday, November 23, 2021 7:37 AM

General information
7
EMU33524
Read manuals and labels
Before operating or working on this outboard motor:
Read this manual.
Read any manuals supplied with the boat.
Read all labels on the outboard motor and the boat.
If you need any additional information, contact your Yamaha dealer.
EMU33836
Warning labels
If these labels are damaged or missing, contact your Yamaha dealer for replacements.
F6DMH, F6DM, F8FMH, FT8GMH
1
2
3
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General information
8
F8FE, FT8GE, FT8GEP
1
23
U6FW76E0.book Page 8 Tuesday, November 23, 2021 7:37 AM

General information
9
EMU33913
Contents of labels
The above warning labels mean as follows.
1
EWM01692
Emergency starting does not have start-
in-gear protection. Ensure shift control is
in neutral before starting engine.
2
EWM01682
Keep hands, hair, and clothing away
from rotating parts while the engine is
running.
Do not touch or remove electrical parts
when starting or during operation.
3
EWM01672
Read Owner’s Manuals and labels.
Wear an approved personal flotation de-
vice (PFD).
Attach engine shut-off cord (lanyard) to
your PFD, arm, or leg so the engine
stops if you accidentally leave the helm,
which could prevent a runaway boat.
6EE-G2794-40
6EE-G2794-50
6EE-H1994-40
6EE-H1994-50
6EE-H1995-40
6EE-H1995-50
ZMU05706
12
3
U6FW76E0.book Page 9 Tuesday, November 23, 2021 7:37 AM

General information
10
EMU33844
Symbols
The following symbols mean as follows.
Notice/Warning
Read Owner’s Manual
Hazard caused by continuous rotation
Electrical hazard
Remote control lever/gear shift lever operat-
ing direction, dual direction
Engine start/ Engine cranking
ZMU05696
ZMU05664
ZMU05665
ZMU05666
ZMU05667
ZMU05668
U6FW76E0.book Page 10 Tuesday, November 23, 2021 7:37 AM

Specifications and requirements
11
EMU38092
Specifications
TIP:
“(AL)” stated in the specification data below
represents the numerical value for the alumi-
num propeller installed.
EMU48360
Dimension and weight:
Overall length:
1043 mm (41.1 in) (FT8GMH)
557 mm (21.9 in) (F6DM, F8FE, FT8GE,
FT8GEP)
983 mm (38.7 in) (F6DMH, F8FMH)
Overall width:
333 mm (13.1 in) (F6DM, F8FE, FT8GE,
FT8GEP)
371 mm (14.6 in) (FT8GMH)
373 mm (14.7 in) (F6DMH, F8FMH)
Overall height S:
1008 mm (39.7 in) (F6DM, F6DMH,
F8FMH)
Overall height L:
1135 mm (44.7 in) (F6DM, F6DMH,
F8FE, F8FMH)
1195 mm (47.0 in) (FT8GE, FT8GEP,
FT8GMH)
Overall height X:
1263 mm (49.7 in) (FT8GE, FT8GMH)
Motor transom height S:
431 mm (17.0 in) (F6DM, F6DMH,
F8FMH)
Motor transom height L:
552 mm (21.7 in) (FT8GE, FT8GMH)
557 mm (21.9 in) (FT8GEP)
558 mm (22.0 in) (F6DM, F6DMH, F8FE,
F8FMH)
Motor transom height X:
620 mm (24.4 in) (FT8GE, FT8GMH)
Dry weight (AL) S:
40 kg (88 lb) (F6DM, F6DMH, F8FMH)
Dry weight (AL) L:
41 kg (90 lb) (F6DM, F6DMH, F8FMH)
43 kg (95 lb) (F8FE, FT8GMH)
44 kg (97 lb) (FT8GE)
49 kg (108 lb) (FT8GEP)
Dry weight (AL) X:
44 kg (97 lb) (FT8GMH)
45 kg (99 lb) (FT8GE)
Performance:
Full throttle operating range:
5000–6000 r/min
Rated power:
4.4 kW (6 HP) (F6DM, F6DMH)
5.9 kW (8 HP) (F8FE, F8FMH, FT8GE,
FT8GEP, FT8GMH)
Idle speed (in neutral):
1000–1100 r/min
Power unit:
Type:
4-stroke SOHC L2 4 valves
Total displacement:
212 cm³ (12.9 c.i.)
Bore ×stroke:
56.0 ×43.0 mm (2.20 ×1.69 in)
Ignition system:
CDI
Spark plug (NGK):
BR6HS-10
Spark plug gap:
0.9–1.0 mm (0.035–0.039 in)
Steering system:
Remote steering (F6DM, F8FE, FT8GE,
FT8GEP)
Tiller handle (F6DMH, F8FMH,
FT8GMH)
Starting system:
Electric starter (F8FE, FT8GE, FT8GEP)
Manual starter (F6DM, F6DMH, F8FMH,
FT8GMH)
Starting carburetion system:
Choke valve
U6FW76E0.book Page 11 Tuesday, November 23, 2021 7:37 AM

Specifications and requirements
12
Valve clearance IN (cold engine):
0.15–0.20 mm (0.0059–0.0079 in)
Valve clearance EX (cold engine):
0.20–0.25 mm (0.0079–0.0098 in)
Battery rating (CCA/EN):
347–411 A (F8FE, FT8GE, FT8GEP)
Battery rating (20HR/IEC):
40 Ah (F8FE, FT8GE, FT8GEP)
Maximum generator output:
6 A (F8FE, FT8GE, FT8GEP)
Lower unit:
Gear shift positions:
Forward-neutral-reverse
Gear ratio:
2.08 (27/13) (F6DM, F6DMH, F8FE,
F8FMH)
2.92 (38/13) (FT8GE, FT8GEP,
FT8GMH)
Trim and tilt system:
Manual tilt (F6DM, F6DMH, F8FE,
F8FMH, FT8GE, FT8GMH)
Power tilt (FT8GEP)
Propeller mark:
N (F6DM, F6DMH, F8FE, F8FMH)
R (FT8GE, FT8GEP, FT8GMH)
Fuel and oil:
Recommended fuel:
Regular unleaded gasoline
Min. research octane number (RON):
90
Fuel tank capacity:
12 L (3.17 US gal, 2.64 Imp.gal)
Recommended engine oil:
YAMALUBE 4 or 4-stroke outboard
motor oil
Recommended engine oil grade 1:
SAE 10W-30/10W-40/5W-30
API SE/SF/SG/SH/SJ/SL
Engine oil quantity:
0.8 L (0.85 US qt, 0.70 Imp.qt)
Lubrication system:
Wet sump
Recommended gear oil:
YAMALUBE outboard gear oil or Hypoid
gear oil
Recommended gear oil grade:
SAE 90 API GL-4
Gear oil quantity:
0.150 L (0.159 US qt, 0.132 Imp.qt)
(F6DM, F6DMH, F8FE, F8FMH)
0.370 L (0.391 US qt, 0.326 Imp.qt)
(FT8GE, FT8GEP, FT8GMH)
Noise and vibration level:
Operator sound pressure level (ICOMIA
39/94):
78.2 dB(A)
Vibration on tiller handle (ICOMIA 38/94):
7.2 m/s² (F6DMH, F8FMH, FT8GMH)
EMU33556
Installation requirements
EMU33566
Boat horsepower rating
EWM01561
Overpowering a boat can cause severe in-
stability.
Before installing the outboard motor(s), con-
firm that the total horsepower of your out-
board motor(s) does not exceed the boat’s
maximum horsepower rating. See the boat’s
capacity plate or contact the manufacturer.
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Specifications and requirements
13
EMU40491
Mounting outboard motor
EWM02501
Improper mounting of the outboard mo-
tor could result in hazardous conditions
such as poor handling, loss of control,
or fire hazards.
Because the outboard motor is very
heavy, special equipment and training is
required to mount it safely.
Your dealer or other person experienced in
proper rigging should mount the outboard
motor using correct equipment and complete
rigging instructions. For further information,
see page 30.
EMU33582
Remote control requirements
EWM01581
If the engine starts in gear, the boat can
move suddenly and unexpectedly, pos-
sibly causing a collision or throwing
passengers overboard.
If the engine ever starts in gear, the
start-in-gear protection device is not
working correctly and you should dis-
continue using the outboard. Contact
your Yamaha dealer.
The remote control unit must be equipped
with a start-in-gear protection device(s). This
device prevents the engine from starting un-
less it is in neutral.
EMU25695
Battery requirements
EMU25723
Battery specifications
The engine cannot be started if battery volt-
age is too low.
EMU36293
Mounting battery
Mount the battery holder securely in a dry,
well-ventilated, vibration-free location in the
boat. WARNING! Do not put flammable
items, or loose heavy or metal objects in
the same compartment as the battery.
Fire, explosion or sparks could result.
[EWM01821]
Battery cable
The battery cable size and length are critical.
Consult your Yamaha dealer about the bat-
tery cable size and length.
EMU25733
To use the battery
ECM01091
A battery cannot be connected to models
that do not have a rectifier or Rectifier
Regulator.
If you wish to use a battery, your outboard
motor must be equipped with the following
parts.
Rectifier or Rectifier Regulator
Lighting coil
If you do not know if your outboard motor is
equipped with these parts, consult your
Yamaha dealer.
Using maintenance-free sealed batteries or
gel cell batteries is not recommended be-
cause they may not be compatible with
Yamaha’s charging system for this outboard
motor.
Battery rating (CCA/EN):
347–411 A (F8FE, FT8GE, FT8GEP)
Battery rating (20HR/IEC):
40 Ah (F8FE, FT8GE, FT8GEP)
U6FW76E0.book Page 13 Tuesday, November 23, 2021 7:37 AM

Specifications and requirements
14
Install an optional Rectifier Regulator or use
accessories rated to withstand 18 volts or
higher with the above models. Consult your
Yamaha dealer for details on installing an op-
tional Rectifier Regulator.
EMU34196
Propeller selection
Next to selecting an outboard motor, select-
ing the right propeller is one of the most im-
portant purchasing decisions a boater can
make. The type, size, and design of your pro-
peller have a direct impact on acceleration,
top speed, fuel economy, and even engine
life. Yamaha designs and manufactures pro-
pellers for every Yamaha outboard motor and
every application.
Your outboard motor came with a Yamaha
propeller selected to perform well over a
range of applications, but there may be uses
where a different propeller would be more
appropriate.
Your Yamaha dealer can help you select the
right propeller for your boating needs. Select
a propeller that will allow the engine to reach
the middle or upper half of the operating
range at full throttle with the maximum boat-
load. Generally, select a larger pitch propeller
for a smaller operating load and a smaller
pitch propeller for a heavier load. If you carry
loads that vary widely, select the propeller
that lets the engine run in the proper range for
your maximum load but remember that you
may need to reduce your throttle setting to
stay within the recommended engine speed
range when carrying lighter loads.
To check the propeller, see page 73.
EMU25771
Start-in-gear protection
Yamaha outboard motors or Yamaha-ap-
proved remote control units are equipped
with start-in-gear protection device(s). This
feature permits the engine to be started only
when it is in neutral. Always select neutral be-
fore starting the engine.
EMU39693
Engine oil requirements
Select an oil grade according to the average
temperatures in the area where the outboard
motor will be used.
1. Propeller diameter in inches
2. Propeller pitch in inches
3. Type of propeller (propeller mark)
1. Propeller diameter in inches
2. Propeller pitch in inches
3. Type of propeller (propeller mark)
ZMU04606
-
x
123
ZMU04605
-
x
123
U6FW76E0.book Page 14 Tuesday, November 23, 2021 7:37 AM