Yamaha F2.5B User manual

Read this manual carefully before operating this
outboard motor.
OWNER’S MANUAL
F2.5B
6EG-F8199-74-E0
U6EG74E0.book Page 1 Tuesday, January 21, 2020 10:34 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.
U6EG74E0.book Page 1 Tuesday, January 21, 2020 10:34 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 F2.5BMH 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.
EMU45001
F2.5B
OWNER’S MANUAL
©2020 by Yamaha Motor Co., Ltd.
1st Edition, December 2019
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Co., Ltd.
is expressly prohibited.
Printed in Thailand
U6EG74E0.book Page 1 Tuesday, January 21, 2020 10:34 AM

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 .............................. 2
Modifications...................................... 2
Boating safety ................................. 2
Alcohol and drugs .............................. 2
Personal flotation devices (PFDs) ...... 2
People in the water ............................ 2
Passengers......................................... 2
Overloading........................................ 2
Avoid collisions .................................. 3
Collisions with floating or submerged
objects ............................................ 3
Weather.............................................. 3
Passenger training ............................. 3
Boating safety publications................ 4
Laws and regulations ......................... 4
General information .......................... 5
Identification numbers record ......... 5
Outboard motor serial 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 outboard motor ................ 11
Propeller selection ........................ 11
Engine oil requirements ................ 12
Fuel requirements ......................... 12
Gasoline ........................................... 12
Anti-fouling paint .......................... 13
Outboard motor disposal
requirements.............................. 13
Emergency equipment.................. 13
Components.................................... 15
Components diagram ................... 15
Fuel tank (built-in fuel tank) .............. 16
Fuel cock.......................................... 17
Tiller handle ..................................... 17
Gear shift lever ................................. 17
Throttle grip ..................................... 18
Throttle indicator .............................. 18
Throttle friction adjuster ................... 18
Engine shut-off cord (lanyard) and
clip ................................................ 19
Engine stop button .......................... 19
Pull-type choke knob ....................... 19
Manual starter handle....................... 20
Steering friction adjuster .................. 20
Trim rod (tilt pin) ............................... 20
Tilt support lever .............................. 20
Cowling lock lever ............................ 21
Carrying handle ................................ 21
Installation ....................................... 22
Installation..................................... 22
Mounting the outboard motor .......... 22
Clamping the outboard motor.......... 24
Operation ......................................... 25
First-time operation ...................... 25
Fill engine oil..................................... 25
Breaking in engine............................ 25
Getting to know your boat ............... 25
Checks before starting engine...... 25
Fuel level .......................................... 26
Remove the top cowling .................. 26
Fuel system ...................................... 26
Controls............................................ 27
Engine shut-off cord (lanyard) .......... 27
Engine oil.......................................... 27
Engine .............................................. 28
Installing top cowling ....................... 28
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Table of contents
Filling fuel ...................................... 29
Operating engine........................... 30
Supplying fuel to engine................... 30
Starting engine ................................. 30
Checks after starting engine ......... 32
Cooling water ................................... 32
Warming up engine ....................... 33
Warming up...................................... 33
Checks after engine warm up ....... 33
Shifting ............................................. 33
Stop switches................................... 33
Shifting .......................................... 33
Stopping boat ............................... 35
Stopping engine............................ 35
Procedure......................................... 35
Trimming outboard motor ............. 36
Adjusting trim angle ......................... 36
Adjusting boat trim........................... 37
Tilting up and down ...................... 38
Procedure for tilting up .................... 38
Procedure for tilting down................ 39
Cruising in other conditions .......... 40
Maintenance .................................... 41
Transporting and storing outboard
motor.......................................... 41
Dismounting and transporting the
outboard motor............................. 41
Storing outboard motor.................... 44
Procedure......................................... 44
Lubrication ....................................... 46
Cleaning the outboard motor ........... 46
Checking painted surface of
outboard motor............................. 46
Periodic maintenance ................... 46
Replacement parts........................... 47
Severe operating conditions ............ 47
Maintenance chart 1 ........................ 48
Maintenance chart 2 ........................ 50
Greasing........................................... 51
Inspecting the spark plug................. 52
Checking fuel filter ........................... 53
Inspecting idle speed ....................... 53
Changing engine oil.......................... 53
Why Yamalube ................................. 55
Checking electrical connectors and
electrical leads .............................. 56
Checking propeller ........................... 56
Removing propeller .......................... 56
Installing propeller ............................ 57
Changing gear oil ............................. 58
Inspecting and replacing anode
(external) ....................................... 58
Trouble Recovery............................ 60
Troubleshooting............................ 60
Temporary action in emergency ... 62
Impact damage ................................ 62
Starter will not operate ..................... 62
Emergency engine starting............... 63
Treatment of submerged motor.... 65
INDEX ............................................... 66
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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.
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.
EMU33811
Gasoline
Gasoline and its vapors are highly flamma-
ble and explosive. Always, refuel according
to the procedure on page 30 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.
U6EG74E0.book Page 1 Tuesday, January 21, 2020 10:34 AM

Safety information
2
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-
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.
U6EG74E0.book Page 2 Tuesday, January 21, 2020 10:34 AM

Safety information
3
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.
EMU48140
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.
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.
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.
ZMU06025
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Safety information
4
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.
U6EG74E0.book Page 4 Tuesday, January 21, 2020 10:34 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.
EMU38983
EC Declaration of Conformity
(DoC)
This declaration is included with outboard
motors that conform to European regula-
tions.
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 manufacturer
Model name
Product code of model (Approved model
code)
Code of conformed directives
EMU38996
CE Marking
This label is affixed to outboard motors that
conform to European regulations.
Outboard motors affixed with this “CE” mark-
ing conform with the directives of;
2006/42/EC, 94/25/EC - 2003/44/EC,
2014/30/EU, and 2004/108/EC, 2013/53/EU.
1. Outboard motor serial number location
1. Serial number
2. Model name
3. Motor transom height
4. Approved model code
1
YAMAHA
THAI YAMAHA MOTOR CO.,LTD.
MADE IN THAILAND
PAYS D’ORIGINE THAÏLANDE
3412
1. CE marking location
1
U6EG74E0.book Page 5 Tuesday, January 21, 2020 10:34 AM