Yamaha F6C User manual

Read this manual carefully before operating this
outboard motor.
OWNER’S MANUAL
F2.5A
F4B
F5A
F6C
6BV-F8199-23-E0
U6BV23E0.book Page 1 Tuesday, April 5, 2011 2:38 PM

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.
U6BV23E0.book Page 1 Tuesday, April 5, 2011 2:38 PM

Important manual information
EMU25107
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.
WARNING
EWM00781
A WARNING indicates a hazardous situa-
tion which, if not avoided, could result in
death or serious injury.
NOTICE
ECM00701
A NOTICE indicates special precautions
that must be taken to avoid damage to the
outboard motor or other property.
T
IP:
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 product
information available at the time of printing,
there may be minor discrepancies between
your machine and this manual. If there is any
question concerning this manual, please con-
sult your Yamaha dealer.
To ensure long product life, Yamaha recom-
mends that you use the product and perform
the specified periodic inspections and mainte-
nance by correctly following the instructions in
the owner’s manual. Any damage resulting
from neglect of these instructions is not cov-
ered 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 specified
services.
T
IP:
The F2.5AMH, F4BMH, F5AMH, F6CMH 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.
EMU25141
F2.5A, F4B, F5A, F6C
OWNER’S MANUAL
©2011 by Yamaha Motor Co., Ltd.
1st Edition, March 2011
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Co., Ltd.
is expressly prohibited.
Printed in France
U6BV23E0.book Page 1 Tuesday, April 5, 2011 2:38 PM

Table of contents
Safety information............................. 1
Outboard motor safety .................... 1
Propeller ............................................. 1
Rotating parts ..................................... 1
Hot parts............................................. 1
Electric shock ..................................... 1
Engine shut-off cord (lanyard) ............ 1
Gasoline ............................................. 1
Gasoline exposure and spills ............. 1
Carbon monoxide ............................... 1
Modifications ...................................... 2
Boating safety ................................. 2
Alcohol and drugs............................... 2
Personal flotation devices .................. 2
People in the water............................. 2
Passengers ........................................ 2
Overloading ........................................ 2
Avoid collisions................................... 2
Weather.............................................. 3
Passenger training ............................. 3
Boating safety publications................. 3
Laws and regulations ......................... 3
General information .......................... 4
Identification numbers record.......... 4
Outboard motor serial number ........... 4
EC Declaration of Conformity (DoC)
(F4B, F5A, F6C)........................... 4
CE Marking (F4B, F5A, F6C) .......... 4
C-Tick label ..................................... 5
Read manuals and labels................ 6
Warning labels.................................... 6
Warning labels.................................... 9
Specifications and
requirements.................................... 12
Specifications ................................ 12
Installation requirements ............... 14
Boat horsepower rating .................... 14
Mounting the outboard motor ........... 14
Propeller selection ........................ 14
Start-in-gear protection
(F4B, F5A, F6C) ........................ 15
Engine oil requirements ................ 15
Fuel requirements ......................... 16
Gasoline ........................................... 16
Muddy or acidic water ................... 16
Anti-fouling paint ........................... 16
Motor disposal requirements......... 16
Emergency equipment .................. 17
Emission control information
(F4B, F5A, F6C) ........................ 17
U.S. insular areas............................. 17
Components .................................... 18
Components diagram.................... 18
Fuel tank (built-in fuel tank) .............. 19
Fuel tank (portable fuel tank)
(F4B, F5A, F6C)............................ 20
Fuel cock .......................................... 21
Tiller handle ...................................... 23
Gear shift lever ................................. 23
Throttle grip ...................................... 24
Throttle indicator............................... 24
Throttle friction adjuster .................... 25
Engine shut-off cord (lanyard) and
clip................................................. 25
Engine stop button ........................... 26
Choke knob for pull type................... 26
Fuel joint cap (F4B, F5A, F6C)......... 27
Manual starter handle....................... 27
Steering friction adjuster................... 27
Trim rod (tilt pin) ............................... 28
Tilt lock mechanism
(F4B, F5A, F6C)............................ 28
Tilt support bar (F4B, F5A, F6C) ...... 29
Tilt support lever (F2.5A) .................. 29
Cowling lock lever ............................ 29
Carrying handle ................................ 30
Installation ....................................... 31
Installation..................................... 31
Mounting the outboard motor ........... 31
Clamping the outboard motor........... 33
U6BV23E0.book Page 1 Tuesday, April 5, 2011 2:38 PM

Table of contents
Operation ......................................... 35
First-time operation ....................... 35
Fill engine oil .................................... 35
Breaking in engine............................ 35
Getting to know your boat ................ 35
Checks before starting engine ...... 35
Fuel level .......................................... 35
Remove the top cowling ................... 36
Fuel system ...................................... 36
Controls ............................................ 36
Engine shut-off cord (lanyard) .......... 37
Engine oil.......................................... 37
Engine .............................................. 38
Installing top cowling ........................ 38
Filling fuel ...................................... 40
Operating engine........................... 44
Sending fuel ..................................... 44
Starting engine ................................. 49
Checks after starting engine ......... 52
Cooling water ................................... 52
Warming up engine ....................... 52
Warming up ...................................... 52
Checks after engine warm up ....... 53
Shifting ............................................. 53
Stop switches ................................... 53
Shifting .......................................... 53
Stopping boat (F2.5A) ................... 54
Stopping boat (F4B, F5A, F6C)..... 55
Stopping engine ............................ 55
Procedure......................................... 55
Trimming outboard motor.............. 59
Adjusting trim angle for manual tilt
models .......................................... 60
Adjusting boat trim............................ 61
Tilting up and down ....................... 62
Procedure for tilting up ..................... 62
Procedure for tilting down................. 67
Shallow water (F4B, F5A, F6C) .... 68
Cruising in shallow water.................. 68
Cruising in other conditions........... 69
Maintenance .................................... 70
Transporting and storing outboard
motor.......................................... 70
Transporting/Dismounting
the outboard motor........................ 70
Storing outboard motor..................... 73
Procedure......................................... 74
Lubrication........................................ 78
Cleaning the outboard motor............ 78
Checking painted surface of
outboard motor.............................. 78
Periodic maintenance ................... 78
Replacement parts ........................... 79
Severe operating conditions............. 79
Maintenance chart 1......................... 80
Maintenance chart 2......................... 82
Greasing ........................................... 82
Cleaning and adjusting spark plug ... 84
Checking fuel filter (F2.5A)............... 85
Checking fuel filter
(F4B, F5A, F6C)............................ 85
Inspecting idle speed........................ 85
Changing engine oil.......................... 85
Checking connector and lead........... 89
Checking propeller ........................... 89
Removing propeller .......................... 89
Installing propeller ............................ 90
Changing gear oil ............................. 90
Inspecting and replacing anode
(external) ....................................... 92
Trouble Recovery............................ 93
Troubleshooting ............................ 93
Temporary action in emergency ... 95
Impact damage................................. 95
Starter will not operate ..................... 95
Emergency engine starting............... 95
Treatment of submerged
motor........................................ 100
U6BV23E0.book Page 2 Tuesday, April 5, 2011 2:38 PM

1
Safety information
EMU33622
Outboard motor safety
Observe these precautions at all times.
EMU36501
Propeller
People can be injured or killed if they come in
contact with the propeller. The propeller can
keep moving even when the motor is in neu-
tral, and sharp edges of the propeller can cut
even when stationary.
●Stop the engine when a person is in the wa-
ter near you.
●Keep people out of reach of the propeller,
even when the engine is off.
EMU33630
Rotating parts
Hands, feet, hair, jewelry, clothing, PFD
straps, etc. can become entangled with inter-
nal rotating parts of the engine, resulting in se-
rious injury or death.
Keep the top cowling in place whenever pos-
sible. Do not remove or replace the cowling
with the engine running.
Only operate the engine with the cowling re-
moved according to the specific instructions in
the manual. Keep hands, feet, hair, jewelry,
clothing, PFD straps, etc. away from any ex-
posed moving parts.
EMU33640
Hot parts
During and after operation, engine parts are
hot enough to cause burns. Avoid touching
any parts under the top cowling until the en-
gine has cooled.
EMU33650
Electric shock
Do not touch any electrical parts while starting
or operating the engine. They can cause
shock or electrocution.
EMU33671
Engine shut-off cord (lanyard)
Attach the engine shut-off cord so that the en-
gine 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 become en-
tangled, preventing it from functioning.
Do not route the cord where it is likely to be
accidentally pulled out. If the cord is pulled
during operation, the engine will shut off and
you will lose most steering control. The boat
could slow rapidly, throwing people and ob-
jects forward.
EMU33810
Gasoline
Gasoline and its vapors are highly flam-
mable and explosive. Always, refuel accord-
ing to the procedure on page 44 to reduce the
risk of fire and explosion.
EMU33820
Gasoline exposure and spills
Take care not to spill gasoline. If gasoline
spills, wipe it up immediately with dry rags.
Dispose of rags properly.
If any gasoline spills onto your skin, 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.
EMU33900
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 ex-
haust outlets.
U6BV23E0.book Page 1 Tuesday, April 5, 2011 2:38 PM

Safety information
2
EMU33780
Modifications
Do not attempt to modify this outboard motor.
Modifications to your outboard motor may re-
duce safety and reliability, and render the out-
board unsafe or illegal to use.
EMU33740
Boating safety
This section includes a few of the many im-
portant safety precautions that you should fol-
low when boating.
EMU33710
Alcohol and drugs
Never operate after drinking alcohol or taking
drugs. Intoxication is one of the most common
factors contributing to boating fatalities.
EMU33720
Personal flotation devices
Have an approved personal flotation device
(PFD) on board for every occupant. Yamaha
recommends that you must wear a PFD
whenever boating. At a minimum, children
and non-swimmers should always wear
PFDs, and everyone should wear PFDs when
there are potentially hazardous boating condi-
tions.
EMU33731
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.
EMU33751
Passengers
Consult your boat manufacturer’s instructions
for details about appropriate passenger loca-
tions in your boat and be sure all passengers
are positioned properly before accelerating
and when operating above an idle speed.
Standing or sitting in non-designated loca-
tions may result in being thrown either over-
board or within the boat due to waves, wakes,
or sudden changes in speed or direction.
Even when people are positioned properly,
alert your passengers if you must make any
unusual maneuver. Always avoid jumping
waves or wakes.
EMU33760
Overloading
Do not overload the boat. Consult the boat ca-
pacity plate or boat manufacturer for maxi-
mum weight and number of passengers. Be
sure that weight is properly distributed ac-
cording to the boat manufacturers instruc-
tions. Overloading or incorrect weight
distribution can compromise the boats han-
dling and lead to an accident, capsizing or
swamping.
EMU33772
Avoid collisions
Scan constantly for people, objects, and other
boats. Be alert for conditions that limit your
visibility or block your vision of others.
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.
ZMU06025
U6BV23E0.book Page 2 Tuesday, April 5, 2011 2:38 PM

Safety information
3
●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 aggressive
maneuvers to reduce the risk of loss of con-
trol, 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 anoth-
er direction.
EMU33790
Weather
Stay informed about the weather. Check
weather forecasts before boating. Avoid boat-
ing in hazardous weather.
EMU33880
Passenger training
Make sure at least one other passenger is
trained to operate the boat in the event of an
emergency.
EMU33890
Boating safety publications
Be informed about boating safety. Additional
publications and information can be obtained
from many boating organizations.
EMU33600
Laws and regulations
Know the marine laws and regulations where
you will be boating- and obey them. Several
sets of rules prevail according to geographic
location, but all are basically the same as the
International Rules of the Road.
U6BV23E0.book Page 3 Tuesday, April 5, 2011 2:38 PM

General information
4
EMU25171
Identification numbers record
EMU25184
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.
F2.5A
F4B, F5A, F6C
EMU37291
EC Declaration of Conformity
(DoC) (F4B, F5A, F6C)
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;
●Name of Engine Manufacture
●Model name
●Product code of model (Approved model
code)
●Code of conformed directives
EMU25205
CE Marking (F4B, F5A, F6C)
Outboard motors affixed with this “CE”mark-
ing conform with the directives of; 98/37/EC,
94/25/EC - 2003/44/EC and 2004/108/EC.
1. Outboard motor serial number location
1. Outboard motor serial number location
ZMU06705
1
1. CE marking location
ZMU06712
1
U6BV23E0.book Page 4 Tuesday, April 5, 2011 2:38 PM

General information
5
EMU25214
C-Tick label
Engines affixed with this label conform to cer-
tain portion(s) of the Australian Radio Com-
munications Act.
F2.5A
F4B, F5A, F6C
1. C-Tick label location
1. C-Tick label location
ZMU06304
ZMU06712
1
ZMU01697
U6BV23E0.book Page 5 Tuesday, April 5, 2011 2:38 PM

General information
6
EMU33523
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.
EMU33832
Warning labels
If these labels are damaged or missing, contact your Yamaha dealer for replacements.
F2.5A
U6BV23E0.book Page 6 Tuesday, April 5, 2011 2:38 PM

General information
7
EMU33922
Contents of labels
The above warning labels mean as follows.
1
WARNING
EWM01701
Gasoline is highly flammable and explo-
sive. Shut off engine before refueling.
Tighten tank cap and air vent screw when
not in use.
2
WARNING
EWM01681
●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
WARNING
EWM01711
●Read Owner’s Manuals and labels.
●Wear an approved personal flotation de-
vice (PFD).
●Ensure shift control is in neutral before
starting engine.
ZMU05810
12
3
U6BV23E0.book Page 7 Tuesday, April 5, 2011 2:38 PM

General information
8
EMU35132
Symbols
The following symbols mean as follows.
Notice/Warning
Read Owner’s Manual
Hazard caused by continuous rotation
Electrical hazard
ZMU05696
ZMU05664
ZMU05665
ZMU05666
U6BV23E0.book Page 8 Tuesday, April 5, 2011 2:38 PM

General information
9
EMU42710
Warning labels
If these labels are damaged or missing, contact your Yamaha dealer for replacements.
F4B, F5A, F6C
4
3
1
2
ZMU06795
U6BV23E0.book Page 9 Tuesday, April 5, 2011 2:38 PM

General information
10
EMU42760
Contents of labels
The above warning labels mean as follows.
1
WARNING
EWM01691
Emergency starting does not have start-
in-gear protection. Ensure shift control is
in neutral before starting engine.
2
WARNING
EWM01681
●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
WARNING
EWM01671
●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.
ZMU07405
12
34
U6BV23E0.book Page 10 Tuesday, April 5, 2011 2:38 PM

General information
11
4
WARNING
EWM01701
Gasoline is highly flammable and explo-
sive. Shut off engine before refueling.
Tighten tank cap and air vent screw when
not in use.
EMU42750
Symbols
The following symbols mean as follows.
Notice/Warning
Read Owner’s Manual
Hazard caused by continuous rotation
Electrical hazard
ZMU05696
ZMU05664
ZMU05665
ZMU05666
U6BV23E0.book Page 11 Tuesday, April 5, 2011 2:38 PM

Specifications and requirements
12
EMU38091
Specifications
T
IP:
“(AL)”stated in the specification data below
represents the numerical value for the alumi-
num propeller installed.
EMU2821K
Dimension:
Overall length:
F2.5AMH 623 mm (24.5 in)
F4BMH 750 mm (29.5 in)
F5AMH 750 mm (29.5 in)
F6CMH 750 mm (29.5 in)
Overall width:
F2.5AMH 345 mm (13.6 in)
F4BMH 333 mm (13.1 in)
F5AMH 333 mm (13.1 in)
F6CMH 333 mm (13.1 in)
Overall height S:
F2.5AMH 1021 mm (40.2 in)
F4BMH 1040 mm (40.9 in)
F5AMH 1040 mm (40.9 in)
F6CMH 1040 mm (40.9 in)
Overall height L:
F4BMH 1168 mm (46.0 in)
F5AMH 1168 mm (46.0 in)
F6CMH 1168 mm (46.0 in)
Transom height S:
F2.5AMH 432 mm (17.0 in)
F4BMH 440 mm (17.3 in)
F5AMH 440 mm (17.3 in)
F6CMH 440 mm (17.3 in)
Transom height L:
F4BMH 568 mm (22.4 in)
F5AMH 568 mm (22.4 in)
F6CMH 568 mm (22.4 in)
Weight (AL) S:
F2.5AMH 17.0 kg (37 lb)
F4BMH 27.0 kg (60 lb)
F5AMH 27.0 kg (60 lb)
F6CMH 27.0 kg (60 lb)
Weight (AL) L:
F4BMH 28.0 kg (62 lb)
F5AMH 28.0 kg (62 lb)
F6CMH 28.0 kg (62 lb)
Performance:
Full throttle operating range:
F2.5AMH 5250–5750 r/min
F4BMH 4000–5000 r/min
F5AMH 4500–5500 r/min
F6CMH 4500–5500 r/min
Maximum output:
F2.5AMH 1.8 kW@5500 r/min (2.5
HP@5500 r/min)
F4BMH 2.9 kW@4500 r/min (4
HP@4500 r/min)
F5AMH 3.7 kW@5000 r/min (5
HP@5000 r/min)
F6CMH 4.4 kW@5000 r/min (6
HP@5000 r/min)
Idle speed (in neutral):
F2.5AMH 1900 ±100 r/min
F4BMH 1500 ±50 r/min
F5AMH 1500 ±50 r/min
F6CMH 1500 ±50 r/min
Engine:
Type:
4-stroke S
Displacement:
F2.5AMH 72.0 cm³
F4BMH 139.0 cm³
F5AMH 139.0 cm³
F6CMH 139.0 cm³
Bore ×stroke:
F2.5AMH 54.0 ×31.5 mm (2.13 ×1.24
in)
F4BMH 62.0 ×46.0 mm (2.44 ×1.81 in)
F5AMH 62.0 ×46.0 mm (2.44 ×1.81 in)
F6CMH 62.0 ×46.0 mm (2.44 ×1.81 in)
U6BV23E0.book Page 12 Tuesday, April 5, 2011 2:38 PM

Specifications and requirements
13
Ignition system:
F2.5AMH TCI
F4BMH CDI
F5AMH CDI
F6CMH CDI
Spark plug (NGK):
F2.5AMH BR6HS
F4BMH CR6HSB
F5AMH CR6HSB
F6CMH CR6HSB
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
Control system:
Tiller handle
Starting system:
Manual starter
Starting carburetion system:
Choke valve
Valve clearance (cold engine) IN:
0.08–0.12 mm (0.0032–0.0047 in)
Valve clearance (cold engine) EX:
0.08–0.12 mm (0.0032–0.0047 in)
Drive unit:
Gear positions:
F2.5AMH Forward-neutral
F4BMH Forward-neutral-reverse
F5AMH Forward-neutral-reverse
F6CMH Forward-neutral-reverse
Gear ratio:
2.08(27/13)
Trim and tilt system:
Manual tilt
Propeller mark:
F2.5AMH BS
F4BMH BA
F5AMH BA
F6CMH BA
Fuel and oil:
Recommended fuel:
Regular unleaded gasoline
Fuel tank capacity:
F4BMH 12.0 L (3.17 US gal,
2.64 Imp.gal)
F5AMH 12.0 L (3.17 US gal,
2.64 Imp.gal)
F6CMH 12.0 L (3.17 US gal,
2.64 Imp.gal)
Fuel tank capacity (built in type):
F2.5AMH 0.9 L (0.24 US gal,
0.20 Imp.gal)
F4BMH 1.1 L (0.29 US gal, 0.24 Imp.gal)
F5AMH 1.1 L (0.29 US gal, 0.24 Imp.gal)
F6CMH 1.1 L (0.29 US gal,
0.24 Imp.gal)
Recommended engine oil:
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:
F2.5AMH 0.4 L (0.42 US qt, 0.35 Imp.qt)
F4BMH 0.6 L (0.63 US qt, 0.53 Imp.qt)
F5AMH 0.6 L (0.63 US qt, 0.53 Imp.qt)
F6CMH 0.6 L (0.63 US qt, 0.53 Imp.qt)
Lubrication:
F2.5AMH Splash
F4BMH Wet sump
F5AMH Wet sump
F6CMH Wet sump
Recommended gear oil:
Hypoid gear oil SAE#90
Gear oil quantity:
F2.5AMH 0.075 L (0.079 US qt,
0.066 Imp.qt)
F4BMH 0.100 L (0.106 US qt,
0.088 Imp.qt)
F5AMH 0.100 L (0.106 US qt,
0.088 Imp.qt)
F6CMH 0.100 L (0.106 US qt,
0.088 Imp.qt)
U6BV23E0.book Page 13 Tuesday, April 5, 2011 2:38 PM

Specifications and requirements
14
Tightening torque for engine:
Spark plug:
F2.5AMH 25.0 Nm (2.55 kgf-m,
18.4 ft-lb)
F4BMH 13.0 Nm (1.33 kgf-m, 9.6 ft-lb)
F5AMH 13.0 Nm (1.33 kgf-m, 9.6 ft-lb)
F6CMH 13.0 Nm (1.33 kgf-m, 9.6 ft-lb)
Engine oil drain bolt:
18.0 Nm (1.84 kgf-m, 13.3 ft-lb)
Noise and vibration level:
Operator sound pressure level (ICOMIA
39/94 and 40/94):
F4BMH 77.5 dB(A) (*EC1)
F5AMH 77.5 dB(A) (*EC1)
F6CMH 77.5 dB(A) (*EC1)(*EC2)
Vibration on tiller handle (ICOMIA 38/94):
F4BMH 5.5 m/s²(*EC1)
F5AMH 5.5 m/s²(*EC1)
F6CMH 5.5 m/s²(*EC1)(*EC2)
EMU33554
Installation requirements
EMU33564
Boat horsepower rating
WARNING
EWM01560
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 boats
maximum horsepower rating. See the boat’s
capacity plate or contact the manufacturer.
EMU43000
Mounting the outboard motor
F2.5A
WARNING
EWM01570
●Improper mounting of the outboard mo-
tor could result in hazardous conditions
such as poor handling, loss of control,
or fire hazards.
●Because the motor is very heavy, spe-
cial equipment and training is required
to mount it safely.
Your dealer or other person experienced in
proper rigging should mount the motor using
correct equipment and complete rigging in-
structions. For further information, see page
31.
F4B, F5A, F6C
WARNING
EWM02430
Improper mounting of the outboard motor
could result in hazardous conditions,
such as poor handling, loss of control, or
fire hazards. If you are not able to mount
the outboard motor properly, consult a
Yamaha dealer.
To lift and mount the outboard motor, two
people are necessary. For further information,
see page 31.
EMU34195
Propeller selection
Next to selecting an outboard motor, selecting
the right propeller is one of the most important
purchasing decisions a boater can make. The
type, size, and design of your propeller have
a direct impact on acceleration, top speed,
fuel economy, and even engine life. Yamaha
designs and manufactures propellers for ev-
ery Yamaha outboard motor and every appli-
cation.
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 ap-
propriate.
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-
U6BV23E0.book Page 14 Tuesday, April 5, 2011 2:38 PM

Specifications and requirements
15
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 89.
F2.5A
F4B, F5A, F6C
EMU39191
Start-in-gear protection (F4B,
F5A, F6C)
Yamaha outboard motors are equipped with
start-in-gear protection device. This feature
permits the engine to be started only when it
is in neutral. Always select neutral before
starting the engine.
EMU39692
Engine oil requirements
Select an oil grade according to the average
temperatures in the area where the outboard
motor will be used.
If oil grades listed under Recommended en-
gine oil grade 1 are not available, select an al-
ternative oil grade listed under
Recommended engine oil grade 2.
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)
ZMU04604
-
x
123
ZMU06853
-
x
123
Recommended engine oil:
4-stroke outboard motor oil
Recommended engine oil grade 1:
SAE 10W-30/10W-40/5W-30
API SE/SF/SG/SH/SJ/SL
Recommended engine oil grade 2:
SAE 15W-40/20W-40/20W-50
API SH/SJ/SL
Engine oil quantity:
F2.5AMH 0.4 L (0.42 US qt,
0.35 Imp.qt)
F4BMH 0.6 L (0.63 US qt,
0.53 Imp.qt)
F5AMH 0.6 L (0.63 US qt,
0.53 Imp.qt)
F6CMH 0.6 L (0.63 US qt,
0.53 Imp.qt)
U6BV23E0.book Page 15 Tuesday, April 5, 2011 2:38 PM