Yamaha F300A User manual

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Read this manual carefully before operating this
outboard motor.
OWNER’S MANUAL
F300A
F350A
FL300A
FL350A
6AW-28199-74-E0

EMU25052
Read this manual carefully before operating this outboard motor. Keep this
manual onboard in a waterproof bag when boating. This manual should stay
with the outboard motor if it is sold.

Important manual information
EMU25105
To the owner
Thank you for choosing 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 ob-
tain maximum enjoyment from your new
Yamaha. If you have any question about the
operation or maintenance of your outboard
motor, please consult a Yamaha dealer.
In this Owner’s Manual particularly important
information is distinguished in the following
ways.
: This is the safety alert symbol. It is
used to alert you to potential personal injury
hazards. Obey all safety messages that fol-
low 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 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 manu-
al, 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
warranty may not apply in certain regions.
When planning to take the product to another
country, consult the dealer where the prod-
uct 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.
T
IP:
The F300AET, F350AET, FL300AET,
FL350AET and the standard accessories are
used as a base for the explanations and illus-
trations in this manual. Therefore some
items may not apply to every model.
EMU25121
F300A, F350A, FL300A, FL350A
OWNER’S MANUAL
©2008 by Yamaha Motor Co., Ltd.
1st Edition, April 2008
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Co., Ltd.
is expressly prohibited.
Printed in Japan

Table of contents
Safety information............................. 1
Outboard motor safety .................... 1
Propeller............................................ 1
Rotating parts.................................... 1
Hot parts ........................................... 1
Electric shock.................................... 1
Power trim and tilt ............................. 1
Engine shut-off cord (lanyard)........... 1
Gasoline............................................ 1
Gasoline exposure and spills ............ 2
Carbon monoxide.............................. 2
Modifications ..................................... 2
Boating safety ................................. 2
Alcohol and drugs ............................. 2
Personal flotation devices ................. 2
People in the water ........................... 2
Passengers ....................................... 2
Overloading....................................... 2
Avoid collisions ................................. 3
Weather ............................................ 3
Passenger training ............................ 3
Boating safety publications ............... 3
Laws and regulations ........................ 3
General information .......................... 4
Identification numbers record.......... 4
Outboard motor serial number .......... 4
Digital electronic control serial
number............................................ 4
Key number....................................... 5
EC Declaration of Conformity
(DoC) ............................................. 5
CE Marking ..................................... 5
Read manuals and labels................ 7
Warning labels .................................. 7
Specifications and requirements... 10
Specifications ................................ 10
Installation requirements ............... 11
Boat horsepower rating................... 11
Mounting motor ............................... 11
Digital electronic control
requirements ............................... 12
Battery requirements..................... 12
Battery specifications ...................... 12
Mounting battery ............................. 12
Multiple batteries............................. 12
Propeller selection ........................ 12
Counter rotation models..................13
Start-in-gear protection ................. 13
Engine oil requirements ................ 14
Fuel requirements......................... 14
Gasoline .......................................... 14
Muddy or acidic water................... 15
Anti-fouling paint ........................... 15
Motor disposal requirements......... 15
Emergency equipment.................. 15
Components .................................... 16
Components diagram.................... 16
Digital electronic control .................. 20
Digital electronic control-active
indicator ........................................ 21
Digital electronic control-alert
indicator ........................................ 22
Control lever .................................... 22
Neutral interlock trigger ................... 23
Free throttle switch..........................23
Throttle friction adjuster................... 25
Station selector switch ....................26
Engine selector switch ....................26
Engine shut-off cord (lanyard) and
clip................................................. 26
Main switch ..................................... 28
Starter button .................................. 29
Engine stop button .......................... 29
Power trim and tilt switch on digital
electronic control........................... 30
Power trim and tilt switch on bottom
engine cowling .............................. 30
Power trim and tilt switches............. 31
Tilt limiter ......................................... 31
Tilt support lever for power trim and
tilt model........................................ 31
Top cowling lock lever (turn type) ...32
Flushing device ............................... 33
Fuel filter/Water separator............... 33
Instruments and indicators............ 34
6Y8 Multifunction meters .............. 34
6Y8 Multifunction tachometers ..... 34
Start-up checks ............................... 34
Adjusting trolling speed ................... 34
Low oil pressure-alert......................35

Table of contents
Overheat alert ................................. 35
Water separator alert ...................... 36
Engine trouble alert......................... 36
Low battery voltage-alert................. 36
6Y8 Multifunction speed & fuel
meters ......................................... 36
6Y8 Multifunction speedometers... 37
6Y8 Multifunction fuel
management meters ................... 38
Engine control system.................... 39
Alert system .................................. 39
Digital Electronic Control alert......... 39
Overheat alert ................................. 39
Low oil pressure alert...................... 41
Installation ....................................... 42
Installation ..................................... 42
Mounting the outboard motor.......... 42
Operation ......................................... 44
First-time operation ....................... 44
Fill engine oil ................................... 44
Breaking in engine .......................... 44
Getting to know your boat ............... 44
Checks before starting engine ...... 44
Fuel level......................................... 45
Remove cowling.............................. 45
Fuel system..................................... 45
Controls........................................... 46
Engine shut-off cord (lanyard)......... 46
Engine oil ........................................ 47
Engine............................................. 48
Flushing device ............................... 48
Install cowling.................................. 48
Checking power trim and tilt
system .......................................... 49
Battery............................................. 50
Filling fuel ...................................... 50
Operating engine........................... 50
Priming fuel system......................... 50
Change of station............................ 51
Starting engine................................ 51
Checks after starting engine ......... 56
Cooling water .................................. 56
Warming up engine ....................... 56
Electric start models........................ 56
Checks after engine warm-up ....... 56
Shifting ............................................ 56
Stop switches .................................. 56
Selecting outboard motor (triple
engine) ........................................ 57
Shifting.......................................... 58
Stopping boat................................ 60
Operating the port / center /
starboard engine ......................... 60
Boat direction................................ 63
Stopping engine............................ 66
Procedure for single station
models .......................................... 66
Procedure for dual station models
(main station) ................................ 66
Procedure for dual station models
(sub station) .................................. 66
Trimming outboard motor.............. 67
Adjusting trim angle (Power trim
and tilt) .......................................... 67
Adjusting boat trim ..........................68
Tilting up and down....................... 69
Procedure for tilting up (power trim
and tilt models)..............................70
Procedure for tilting down (power
trim and tilt models).......................71
Shallow water................................ 72
Power trim and tilt models...............72
Cruising in other conditions........... 74
Maintenance .................................... 75
Transporting and storing outboard
motor ........................................... 75
Storing outboard motor ...................75
Procedure........................................ 75
Lubrication....................................... 76
Flushing power unit ......................... 76
Cleaning the outboard motor........... 77
Checking painted surface of
motor............................................. 77
Periodic maintenance ................... 78
Replacement parts .......................... 78
Severe operating conditions............ 78
Maintenance chart 1........................ 79
Maintenance chart 2........................ 81
Greasing.......................................... 82
Cleaning and adjusting spark

Table of contents
plug ............................................... 83
Inspecting idling speed ................... 86
Changing engine oil ........................ 86
Checking wiring and connectors ..... 86
Checking propeller .......................... 87
Removing propeller......................... 87
Installing propeller........................... 88
Changing gear oil............................ 88
Inspecting and replacing
anode(s)........................................ 90
Checking battery (for electric start
models) ......................................... 90
Connecting the battery.................... 91
Disconnecting the battery ............... 93
Trouble Recovery ............................ 94
Troubleshooting ............................ 94
Temporary action in emergency.... 97
Impact damage ............................... 97
Running in an emergency (twin
engines or triple engines) ............. 97
Replacing fuse ................................ 98
Power trim and tilt will not
operate.......................................... 99
Water separator-alert indicator
blinks while cruising ...................... 99
Treatment of submerged motor... 101

1
Safety information
EMU33622
Outboard motor safety
Observe these precautions at all times.
EMU36500
Propeller
People can be injured or killed if they come
in contact with the propeller. The propeller
can keep moving even when the motor is in
neutral, and sharp edges of the propeller can
cut even when stationary.
●
Shut off the engine when a person is in the
water near you.
● Keep people out of reach of the propeller,
even when the engine is off.
EMU33630
Rotating parts
Hands, feet, hair, jewelry, clothing, PFD
straps, etc. can become entangled with inter-
nal 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 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, jewel-
ry, clothing, PFD straps, etc. away from any
exposed moving parts.
EMU33640
Hot parts
During and after operation, engine parts are
hot enough to cause burns. Avoid touching
any parts under the top cowling until the en-
gine has cooled.
EMU33650
Electric shock
Do not touch any electrical parts while start-
ing or operating the engine. They can cause
shock or electrocution.
EMU33660
Power trim and tilt
Body parts can be crushed between the mo-
tor and the clamp bracket when the motor is
trimmed or tilted. Keep body parts out of this
area at all times. Be sure no one is in this
area before operating the power trim and tilt
mechanism.
The power trim and tilt switches operate
even when the main switch is off. Keep peo-
ple be away from the switches whenever
working around the motor.
Never get under the lower unit while it is tilt-
ed, even when the tilt support lever is locked.
Severe injury could occur if the outboard mo-
tor accidentally falls.
EMU33671
Engine shut-off cord (lanyard)
Attach the engine shut-off cord so that the
engine stops if the operator falls overboard
or leaves the helm. This prevents the boat
from running away under power and leaving
people stranded, or running over people or
objects.
Always attach the engine shut-off cord to a
secure place on your clothing or your arm or
leg while operating. Do not remove it to leave
the helm while the boat is moving. Do not 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.
EMU33810
Gasoline
Gasoline and its vapors are highly flam-
mable and explosive. Always, refuel ac-
cording to the procedure on page 50 to
reduce the risk of fire and explosion.

Safety information
2
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
contain carbon monoxide, a colorless, odor-
less gas which may cause brain damage or
death when inhaled. Symptoms include nau-
sea, dizziness, and drowsiness. Keep cock-
pit and cabin areas well ventilated. Avoid
blocking exhaust outlets.
EMU33780
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.
EMU33740
Boating safety
This section includes a few of the many im-
portant safety precautions that you should
follow when boating.
EMU33710
Alcohol and drugs
Never operate after drinking alcohol or tak-
ing drugs. Intoxication is one of the most
common factors contributing to boating fatal-
ities.
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 boat-
ing conditions.
EMU33730
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
someone is in the water near the boat, shift
into neutral and shut off the motor.
Stay away from swimming areas. Swimmers
can be hard to see.
The propeller can keep moving even when
the motor is in neutral. Shut off the engine
when a person is in the water near you.
EMU33750
Passengers
Consult your boat manufacturer’s instruc-
tions for details about appropriate passenger
locations in your boat and be sure all pas-
sengers are positioned properly before ac-
celerating 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-
erly, alert your passengers if you must make
any unusual maneuver. Always avoid jump-
ing waves or wakes.
EMU33760
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 manufacturers instruc-
tions. Overloading or incorrect weight
distribution can compromise the boats han-

Safety information
3
dling and lead to an accident, capsizing or
swamping.
EMU33771
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, ob-
jects, 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 another direction.
EMU33790
Weather
Stay informed about the weather. Check
weather forecasts before boating. Avoid
boating in hazardous weather.
EMU33880
Passenger training
Make sure at least one other passenger is
trained to operate the boat in the event of an
emergency.
EMU33890
Boating safety publications
Be informed about boating safety. Additional
publications and information can be obtained
from many boating organizations.
EMU33600
Laws and regulations
Know the marine laws and regulations where
you will be boating- and obey them. Several
sets of rules prevail according to geographic
location, but all are basically the same as the
International Rules of the Road.
ZMU06025

4
General information
EMU25171
Identification numbers record
EMU25183
Outboard motor serial number
The outboard motor serial number is
stamped on the label attached to the port
side of the clamp bracket.
Record your outboard motor serial number in
the spaces provided to assist you in ordering
spare parts from your Yamaha dealer or for
reference in case your outboard motor is sto-
len.
EMU34942
Digital electronic control serial
number
The digital electronic control serial number is
stamped on the label attached to the digital
electronic control box.
Record your digital electronic control serial
number in the spaces provided to assist you
in newly connecting the digital electronic
control to the outboard motor.
T
IP:
Consult your Yamaha dealer if you have any
questions concerning the digital electronic
control serial number.
1. Outboard motor serial number location
1ZMU05814
ZMU06224
1
ZMU05885
1
ZMU05887
1