Yamaha 25C User Manual
OWNER’S MANUAL
25C
U.S.A.Edition
LIT-18626-05-42
EMU14480
TO THE OWNER
Thank you for choosing a Yamaha outboard motor. This Owner’s manual contains information needed for proper operation, maintenance and care. A thorough
understanding of these simple instructions will help you obtain maximum
enjoyment from your new Yamaha. If you
have any question about the operation or
maintenance of your outboard motor,
please consult a Yamaha dealer.
In this Owner’s Manual particularly
important information is distinguished in
the following ways.
The Safety Alert Symbol means
ATTENTION! BECOME ALERT!
Q
YOUR SAFETY IS INVOLVED!
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A CAUTION indicates special precautions
that must be taken to avoid damage to
the outboard motor.
NOTE:
A NOTE provides key information to make
procedures easier or clearer.
* Yamaha continually seeks advance-
ments 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 consult your Yamaha dealer.
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Failure to follow WARNING instructions
could result in severe injury or death to
the machine operator, a bystander, or a
person inspecting or repairing the outboard motor.
EMU01446
OWNER'S MANUAL
©2003 by Yamaha Motor Corporation, USA
1st Edition, March 2003
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Corporation, USA
is expressly prohibited.
Printed in Japan
P/N LIT-18626-05-42
NOTE:
The 25MH and its standard accessories
are used as a base for the explanations
and illustrations in this manual. Therefore, some items may not apply to every
model.
25C
EMA20010
CONTENTS
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GENERAL INFORMATION
BASIC COMPONENTS
OPERATION
MAINTENANCE
1
2
3
4
TROUBLE RECOVERY
INDEX
READ THIS OWNER’S MANUAL CAREFULLY
BEFORE OPERATING YOUR OUTBOARD MOTOR.
5
6
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EMB00010
Chapter 1
GENERAL
INFORMATION
IDENTIFICATION NUMBERS RECORD ..1-1
Outboard motor serial number...........1-1
EMISSION CONTROL INFORMATION...1-2
SAFETY INFORMATION..........................1-3
IMPORTANT LABELS ..............................1-5
1
2
BASIC BOATING RULES .........................1-6
FUELING INSTRUCTIONS.....................1-10
Gasoline ..............................................1-11
Engine oil ............................................1-11
PROPELLER SELECTION .......................1-12
START-IN-GEAR PROTECTION ............1-13
3
4
5
6
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EMU00005
IDENTIFICATION NUMBERS
RECORD
EMU00007
OUTBOARD MOTOR SERIAL NUMBER
YAMAHA MOTOR CO., LTD.
MADE IN JAPAN
PAYS D'ORIGINE JAPON
1
401012
The outboard motor serial number is
stamped on the label attached to the port
side of the clamp-bracket.
Record your outboard motor serial number in the spaces provided to assist you in
ordering spare parts from your Yamaha
dealer or for reference in case your outboard motor is stolen.
1 Outboard motor serial number
1-1
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1
2
108021
EMISSION CONTROL INFORMATION
ENGINE FAMILY :
THIS ENGINE CONFORMS TO 2001 U.S. EPA REGULATIONS FOR MARINE SI ENGINES.
REFER TO THE OWNERS MANUAL FOR MAINTENANCE SPECIFICATIONS AND ADJUSTMENTS.
FELs :
SPARK PLUG :
DISPLACEMENT :
ADVERTISED POWER :
IDLE SPEED :
SPARK PLUG GAP (mm) :
FUEL : GASOLINE
VALVE LASH (mm) :
IN EX
cm
kw
g/kw-hr
rpm IN NEUTRAL
3
Manufactured:
25
25-3/30
2
1
EMU01385
EMISSION CONTROL
INFORMATION
EMU01386
NORTH AMERICAN MODELS
This engine conforms to U.S. Environmental Protection Agency (EPA) regulations for marine SI engines. See the label
affixed to your engine for details.
Approval label of Emission control
certificate
This label is attached to the bottom cowling.
1 Emission control information label
108022
Existing Technology ; N/A
Manufactured date label
This label is attached to the clamp bracket
or the swivel bracket.
2 Manufactured date label
1-2
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EMU00917
SAFETY
Q
8 Before mounting or operating the out-
board motor, read this entire manual.
Reading it should give you an understanding of the motor and its operation.
8 Before operating the boat, read any
owner’s or operator’s manuals supplied
with it and all labels. Be sure you understand each item before operating.
8 Do not overpower the boat with this
outboard motor. Overpowering the
boat could result in loss of control. The
rated power of the outboard should be
equal to or less than the rated horsepower capacity of the boat. If the rated
horsepower capacity of the boat is
unknown, consult the dealer or boat
manufacturer.
8 Do not modify the outboard. Modifica-
tions could make the motor unfit or
unsafe to use.
8 Never operate after drinking alcohol or
taking drugs. About 50% of all boating
fatalities involve intoxication.
8 Have an approved personal flotation
device (PFD) on board for every occupant. It is a good idea to 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.
8 Gasoline is highly flammable, and its
vapors are flammable and explosive.
Handle and store gasoline carefully.
Make sure there are no gas fumes or
leaking fuel before starting the engine.
INFORMATION
8 This product emits exhaust gases which
contain carbon monoxide, a colorless,
odorless gas which may cause brain
damage or death when inhaled. Symptoms include nausea, dizziness, and
drowsiness. Keep cockpit and cabin
areas well ventilated. Avoid blocking
exhaust outlets.
8 Check throttle, shift, and steering for
proper operation before starting the
engine.
8 Attach the engine stop switch lanyard
to a secure place on your clothing, or
your arm or leg while operating. If you
accidentally leave the helm, the lanyard
will pull from the switch, stopping the
engine.
8 Know the marine laws and regulations
where you will be boating - and obey
them. Refer to the “RULES OF THE
ROAD” section for basic boating rules.
8 Stay informed about the weather.
Check weather forecasts before boating.
Avoid boating in hazardous weather.
8 Tell someone where you are going:
leave a Float Plan with a responsible
person. Be sure to cancel the Float Plan
when you return.
8 Use common sense and good judgment
when boating. Know your abilities, and
be sure you understand how your boat
handles under the different boating
conditions you may encounter. Operate
within your limits, and the limits of your
boat. Always operate at safe speeds,
and keep a careful watch for obstacles
and other traffic.
8 Always watch carefully for swimmers
during the engine operation.
8 Stay away from swimming areas.
1-3
8 When a swimmer is in the water near
you shift into neutral and shut off the
engine.
8 Be informed about boating safety. Addi-
tional publications and information can
be obtained from many organizations,
including the following:
United States Coast Guard
Consumer Affairs Staff (G-BC)
Office of Boating, Public, and Consumer
Affairs
U.S. Coast Guard Headquarters
Washington, D.C. 20593-0001
Boating Safety Hotline: 1-800-368-5647
National Marine Manufacturers
Association (NMMA)
401 N. Michigan Ave.
Chicago, Il 60611
Marine Retailers Association of America
155 N. Michigan Ave.
Chicago, Il 60601
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WARNING
●Be sure shift control is in neutral
before starting engine. (except 2HP)
●Do not touch or remove electrical parts
when starting or during operation.
●Keep hands,hair,and clothes away from flywheel
and other rotating parts while engine is running.
6A1-83625-41
202061
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LOCATION
25
25-3/30
EMB30010
IMPORTANT LABELS
WARNING LABELS
1
2
This engine is equipped with a neutral starting device.
The engine will not start unless the shift control is
in neutral position.
WARNING
6E0-83627-41
1-5
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EMB40010
BASIC BOATING RULES
(Rules of the road)
Just as there are rules which apply when
you are driving on streets and high ways,
there are waterway rules which apply
when you are driving your boat. These
rules are used internationally, and are
also enforced by the United States Coast
Guard and local agencies. You should be
aware of these rules, and follow them
whenever you encounter another vessel
on the water.
Several sets of rules prevail according to
geographic location, but are all basically
the same as the International Rules of the
Road. The rules presented here in your
Owner’s Manual are condensed, and have
been provided for your convenience only.
Consult your local U.S. Coast Guard Auxiliary or Department of Motor Vehicles for
a complete set of rules governing the
waters in which you will be using your
boat.
STEERING AND SAILING RULES AND
SOUND SIGNALS
Whenever two vessels on the water meet
one another, one vessel has the right-ofway; it is called the “stand-on” vessel.
The vessel which does not have the rightof-way is called the “give-way” or “bur-
dened” vessel. These rules determine
which vessel has the right-of-way, and
what each vessel should do.
Stand-on vessel
The vessel with the right-of-way has the
duty to continue its course and speed,
except to avoid an immediate collision.
When you maintain your direction and
speed, the other vessel will be able to
determine how best to avoid you.
Give-way vessel
The vessel which does not have the rightof-way has the duty to take positive and
timely action to stay out of the way of the
Stand-On vessel. Normally, you should
not cross in front of the vessel with the
right-of-way. You should slow down or
change directions briefly and pass behind
the other vessel. You should always move
in such a way that the operator of the
other vessel can see what you are doing.
“The general prudential rule”
This rule is called Rule 2 in the International Rules and says,
‘In obeying and construing these
rules due regard shall be had to all
dangers of navigation and collision,
and to any special circumstances,
which may render a departure from
the above rules necessary in order to
avoid immediate danger.’
In other words, follow the standard rules
except when a collision will occur unless
both vessels try to avoid each other. If
that is the case, both vessels become
“Give-Way” vessels.
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RULES WHEN ENCOUNTERING
VESSELS
There are three main situations which you
may encounter with other vessels which
could lead to a collision unless the Steering Rules are followed:
Meeting (you are approaching another
vessel head-on)
Crossing (you are travelling across the
other vessel’s path)
Overtaking (you are passing or being
passed by another vessel)
In the following illustration, your boat is
in the center. You should give the right-ofway to any vessels shown in white area
(you are the Give-Way vessel). Any vessels in the shaded area must yield to you
(they are the Give-Way vessels). Both you
and the meeting vessel must alter course
to avoid each other.
side. This rule doesn’t apply if both of you
will clear one another if you continue on
your set course and speed.
102044
Crossing
When two power driven vessels are
crossing each other’s path close enough
to run the risk of collision, the vessel
which has the other on the starboard
(right) side must keep out of the way of
the other. If the other vessel is on your
right, you must keep out of its way; you
are the Give-Way vessel. If the other vessel is on your port (left) side, remember
that you should maintain course and
direction, provided the other vessel gives
you the right-of-way as it should.
102045
Meeting
If you are meeting another power vessel
head on, and are close enough to run the
risk of collision, neither of you has the
right-of-way! Both of you should alter
course to avoid an accident. You should
keep the other vessel on your port (left)
102046
Overtaking
If you are passing another vessel, you are
the “Give-Way” vessel. This means that
1-7
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the other vessel is expected to maintain
its course and speed. You must stay out
of its way until you are clear of it. Likewise, if another vessel is passing you, you
should maintain your speed and direction
so that the other vessel can steer itself
around you.
OTHER SPECIAL SITUATIONS
There are three other rules you should be
aware of when driving your boat around
other vessels.
Narrow channels and bends
When navigating in narrow channels, you
should keep to the right when it is safe
and practical to do so. If the operator of a
power-driven vessel is preparing to go
around a bend that may obstruct the view
of other water vessels, the operator
should sound a prolonged blast on the
whistle (4 to 6 seconds). If another vessel
is around the bend, it too should sound
the whistle. Even if no reply is heard,
however, the vessel should still proceed
around the bend with caution. If you navigate such waters with your boat, you will
need to carry a portable air horn, available from local marine supply stores.
Fishing vessel right-of-way
All vessels which are fishing with nets,
lines or trawls are considered to be “fish-
ing vessels” under the International
Rules. Vessels with trolling lines are not
considered fishing vessels. Fishing vessels have the right-of-way regardless of
position. Fishing vessels cannot, however, impede the passage of other vessels in
narrow channels.
Sailing vessel right-of-way
Sailing vessels should normally be given
the right-of-way. The exceptions to this
are:
1. When the sailing vessel is overtaking
the power-driven vessel, the powerdriven vessel has the right-of-way.
2. Sailing vessels should keep clear of
any fishing vessel.
3. In a narrow channel, a sailing vessel
should not hamper the safe passage
of a power-driven vessel which can
navigate only in such a channel.
Reading buoys and other markers
The waters of the United states are
marked for safe navigation by the lateral
system of buoyage. Simply put, buoys
and markers have an arrangement of
shapes, colors, numbers and lights to
show which side of the buoy a boater
should pass on when navigating in a particular direction. The markings on these
buoys are oriented from the perspective
of being entered from seaward (the
boater is going towards the port). This
means that red buoys are passed on the
starboard (right) side when proceeding
from open water into port, and black
buoys are to port (left) side. When navigating out of port, your position with
respect to the buoys should be reversed;
red buoys should be to port and black
buoys to starboard.
Many bodies of water used by boaters are
entirely within the boundaries of a particular state. The Uniform State Waterway
Marking System has been devised for
these waters. This system uses buoys and
signs with distinctive shapes and colors
to show regulatory or advisory informa-
1-8
tion. These markers are white with black
1
1
A
1
1
Proceeding toward head
of navigation from seaward
CAN BUOY
Odd number. Leave to port.
OR
SECONDARY CHANNEL BUOYS
STARTS NEW NUMBERING SYSTEM
old new
C " 1
"
NUN BUOY
Even number. Leave to starboard
N
"
2
"
No change
BUOY
COLOR CODE
BLACK
RED
GREEN
"
A
"
"
2
"
"
1
"
"
3
"
"
4
"
"
5
"
"
7
"
N
"
2
"
"
6
"
C
"
1
"
RB
"
L
"
RG
"
L
"
or
SECONDARY CHANNEL
MAIN CHANNEL
old
new
2
2
2
A
L
L
Odd number. increasing toward head of naviga-
MAIN CHANNEL BUOYS
"
1
" "
3
" "
5
" "
7
"
tion.Leave to port (left) proceeding upstream.
LIGHTED BUOY (Port Hand)`
White Light
Green Light
old
new
old
new
old
new
LIGHTED BUOY (Starboard Hand)`
"
2
" "
4
" "
6
"
Even number,increasing toward head of navigation. Leave to starboard (right) proceeding upstream.
White Light Red Light
"
A
"
LIGHTED SAFE WATER BUOY
No number. Marks midchannel, pass on either
side. Letter has no lateral significance, used for
No number. Topmost band red
-
preferred
Top Mark
White Light
White Light
OR
OR
LIGHTED PREFERRED CHANNEL TO
RB
"
L
"
RG
"
L
"
PORT BUOY
identification and location purposes.
channel is to left of buoy. Letter has no lateral
significance, used for identification and location
purposes.
Red Light
Red or
White Light
OR
102052
letters and orange boarders. They signify
speed zones, restricted areas, danger
areas, and general information.
Remember, markings may vary by geographic location. Always consult local
boating authorities before driving your
boat in unfamiliar waters.
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EMU00016
FUELING INSTRUCTIONS
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GASOLINE AND ITS VAPORS ARE HIGHLY FLAMMABLE AND EXPLOSIVE!
8 Do not smoke when refueling, and
keep away from sparks, flames, or
other sources of ignition.
8 Stop engine before refueling.
8 Refuel in a well-ventilated area. Refuel
portable fuel tanks off the boat.
8 Take care not to spill gasoline. If gaso-
line spills, wipe it up immediately with
dry rags.
8 Do not overfill the fuel tank.
8 Tighten the filler cap securely after
refueling.
8 If you should swallow some gasoline
inhale a lot of gasoline vapor, or get
gasoline in your eyes, get immediate
medical attention.
8 If any gasoline spills onto your skin,
immediately wash with soap and
water. Change clothing if gasoline spills
on it.
8 Touch the fuel nozzle to the filler open-
ing or funnel to help prevent electrostatic sparks.
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Use only new clean gasoline which has
been stored in clean containers and is not
contaminated with water or foreign matter.
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EMU01804
GASOLINE
Recommended gasoline:
Regular unleaded gasoline with a
minimum octane rating of 86
(Pump Octane Number) = (R+M)/2
If knocking or pinging occurs, use a different brand of gasoline or premium unleaded fuel.
EMU00027
Gasohol
There are two types of gasohol: gasohol
containing ethanol and that containing
methanol. Gasohol containing ethanol
can be used if ethanol content does not
exceed 10% and the fuel meets minimum
octane ratings. Gasohol containing
methanol is not recommended by Yamaha because it can cause fuel system damage or engine performance problems.
EMU00858
ENGINE OIL
Recommended engine oil:
YAMALUBE 2 STROKE OUTBOARD
OIL
If the recommended engine oil is not
available, another 2-stroke engine oil with
a NMMA-certified TC-W3 rating may be
used.
1-11
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EMU01395
PROPELLER SELECTION
The performance of your outboard motor
will be critically affected by your choice of
propeller, as an incorrect choice could
adversely affect performance and could
also seriously damage the motor. Engine
speed depends on the propeller size and
boat load. If engine speed is too high or
too low for good engine performance,
this will have an adverse effect on the
engine.
Yamaha outboard motors are fitted with
propellers chosen to perform well over a
range of applications, but there may be
uses where a propeller with a different
pitch would be more appropriate. For a
greater operating load, a smaller-pitch
propeller is more suitable as it enables
the correct engine speed to be maintained. Conversely, a larger-pitch propeller is more suitable for a smaller operating load.
Yamaha dealers stock a range of propellers, and can advise you and install a
propeller on your outboard that is best
suited to your application.
1-12
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602016
10-3/4x17-F
123
NOTE:
At full throttle and under a maximum
boat load, the engine’s rpm should be
within the upper half of the full throttle
operating range, as listed in “SPECIFICA-
TIONS” on page 4-1. Select a propeller
which fulfills this requirement.
If operating under conditions which allow
the engine’s rpm to rise above the maximum recommended range (such as light
boat loads), reduce the throttle setting to
maintain the rpm in the proper operating
range.
1 Propeller diameter (in inches)
2 Propeller pitch (in inches)
3 Type of propeller (propeller mark)
Refer to the section “CHECKING PROPELLER” for instructions on propeller
removal and installation.
EMU01209
START-IN-GEAR PROTECTION
Yamaha outboard motors or Yamaha
approved remote control units are
equipped with start-in-gear protection
device(s). This feature permits the engine
to be started only when it is Neutral.
Always select Neutral before starting the
engine.
1-13
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EMC00010
Chapter 2
BASIC COMPONENTS
MAIN COMPONENTS..............................2-1
OPERATIONS OF CONTROLS AND
OTHER FUNCTIONS ................................2-3
Fuel tank ................................................2-3
Gear shift lever .....................................2-3
Engine stop lanyard switch .................2-4
Engine stop button...............................2-5
Tiller handle ..........................................2-5
Choke knob ...........................................2-6
Recoil starter handle ............................2-6
Steering friction adjusting screw........2-7
Trim tab .................................................2-8
Trim angle adjusting rod .....................2-8
Shallow water lever .............................2-9
Tilt lock mechanism .............................2-9
Tilt support bar ...................................2-10
Tilt support lever ................................2-10
Top cowling lock lever.......................2-10
WARNING SYSTEM ..............................2-11
Overheat warning...............................2-11
Oil level warning / oil filter clogging
warning ...............................................2-12
1
2
3
4
5
6
EMU01206
101061
!1
!0
!6
!2
!4 u
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!5
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MAIN COMPONENTS
1 Recoil starter handle
2 Choke knob
3 Warning lamp
4 Gear shift lever
5 Throttle-control grip/Tiller-handle
6 Engine stop button/
Engine stop lanyard switch
7 Transom-clamp handle
8 Tilt lock lever
9 Cooling water inlet
0 Propeller
q Trim tab (Anode)
w Anti-cavitation plate
e Trim angle adjusting-rod
r Rope attachment
t Shallow water lever
y Fuel tank
* May not be exactly as shown; also may
not be included as standard equipment on
all models.
2-1
EMU01206
1
2
3
4
6
8
9
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5
25-3/30
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MAIN COMPONENTS
1 Recoil starter handle
2 Gear shift lever
3 Tiller handle
4 Tilt lock lever
5 Shallow water lever
6 Transom clamp handle
7 Trim angle adjusting rod
8 Cooling water inlet
* 9 Propeller
0 Anti-cavitation plate
q Trim tab
w Clamp bracket
e Tilt support lever
r Rope attachment
t Top cowling
y Choke knob
u Engine stop button/engine stop lanyard
switch
i Warning indicator
* o Remote control box
* p Fuel tank
* May not be exactly as shown; also may not
be included as standard equipment on all
models.
2-2
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902051
EMC20010
OPERATIONS OF CONTROLS
AND OTHER FUNCTIONS
EMC21012
FUEL TANK
If your model was equipped with a
portable fuel tank, its function is as follows.
1 Fuel hose joint
2 Fuel meter(If equipped)
3 Fuel tank cap
4 Air vent screw(If equipped)
Fuel hose joint
This connector is provided for connecting
or disconnecting fuel hose.
Fuel meter
This meter is on the fuel tank cap. It
shows current fuel quantity in the fuel
tank approximately.
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406015
Fuel tank cap
This cap is for filling fuel. To remove it,
turn it counterclockwise.
Air Vent screw
This screw is on the fuel tank cap. To
loosen it, turn it counterclockwise.
EMC25010
GEAR SHIFT LEVER (for Tiller control
model)
Turning the gear-shift lever towards you
engages the clutch with the forward gear
so that the boat moves ahead. Turning
the lever away from you engages the
reverse gear so that the boat moves
astern.
1 Neutral
2 Forward
3 Reverse
2-3
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1
2
001127
25
25-3/30
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EMC28111
ENGINE STOP LANYARD SWITCH
(for Tiller control model)
The lock-plate on the end of the lanyard
must be attached to the engine stop
switch for the engine to run. The lanyard
should be attached to a secure place on
the operator’s clothing, or arm or leg.
Should the operator fall overboard or
leave the helm, the lanyard will pull out
the lock plate, stopping ignition to the
engine. This will prevent the boat from
running away under power.
1 Lock-plate
2 Lanyard
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8 Attach the engine stop switch lanyard
to a secure place on your clothing, your
arm or leg while operating.
8 Do not attach the lanyard to clothing
that could tear loose. Do not route the
lanyard in such a way that it could
become entangled, preventing it from
functioning.
8 Avoid accidentally pulling the lanyard
during normal operation. Loss of
engine power means the loss of most
steering control. Also, without engine
power, the boat could slow rapidly.
This could cause people and objects in
the boat to be thrown forward.
NOTE:
The engine cannot be started with the
lock-plate removed.
2-4
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503022**
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503021*
EMC27011
ENGINE STOP BUTTON
(for Tiller control model)
Pushing this button opens the ignition circuit and stops the engine.
EMU00062
TILLER HANDLE (for Tiller control
model)
Moving the tiller handle sideways to
adjust the steering direction. In addition,
this handle contains the functions as follows.
1 Throttle control grip
2 Throttle indicator
3 Throttle friction adjusting knob/screw
EMU00065
Throttle Control Grip
The throttle control grip is on the tiller
handle. Turn the grip counterclockwise to
increase speed and clockwise to decrease
speed.
503032
EMU00067
Throttle Indicator
The fuel consumption curve on the throttle indicator shows the relative amount of
fuel consumed for each throttle position.
Choose the setting that offers the best
performance and fuel economy for the
desired operation.
1 Throttle indicator
2-5
502011
209015
25 25-3/30
305022*
EMU01293
Throttle friction adjusting screw/ knob
A friction device in the tiller handle provide resistance to movement of the throttle grip.
This is adjustable for operator preference.
An adjusting screw/knob is located within
the tiller handle.
Resistance Knob/Screw
Increase Turn clockwise
Decrease Turn counterclockwise
When constant speed is desired, tighten
the adjusting screw/bolt to maintain the
desired throttle setting.
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Do not over tighten the friction adjusting
screw/ knob.
If there is too much resistance, it may be
difficult to move the throttle grip, which
could result in an accident.
EMC42010
CHOKE KNOB
Pulling out this knob (setting it to ON)
supplies a rich mixture required to start
the engine.
305023*
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NOTE:
The choke knob for Remote control model
has the same function as the choke switch
on the remote control box.
EMC44010
RECOIL STARTER HANDLE
(If equipped)
Pull the handle gently until resistance is
felt. Then vigorously pull the handle
straight out to crank the engine to start it.
2-6
408015
E
EMD00011
STEERING FRICTION ADJUSTING
SCREW(for Tiller control model)
A friction device provides resistance to
steering movement. This is adjustable for
operator preference. An adjusting
screw/bolt is located on the swivel bracket.
EMD00310*
Adjustment
Resistance Screw/bolt
Increased Turn clockwise
Decreased Turn counterclockwise
w
Do not overtighten the friction
screw/bolt.
If there is too much resistance, it may be
difficult to steer, which could result in an
accident.
2-7
E
603011
w
q
AB
404015
EMU00113
TRIM TAB
The trim tab should be adjusted so that
the steering control can be turned to
either the right or left by applying the
same amount of force.
w
An improperly adjusted trim tab may
cause difficult steering. Always test run
after the trim tab has been installed or
replaced to be sure steering is correct. Be
sure you have tightened the bolt after
adjusting the trim tab.
1 Trim tab
2 Bolt
3 Cap (If equipped)
25
001769
25-3/30
Boat tends
to veer
The fin of trim tab
To the left Turn to the left
(port side) (A in the figure)
To the right
(starboard
side)
Turn to the right
(B in the figure)
cC
The trim tab also serves as an anode to
protect the engine from electrochemical
corrosion. Never paint the trim tab as it
will become ineffective as an anode.
EMU01297
TRIM ANGLE ADJUSTING ROD
The position of the trim angle adjusting
rod determines the minimum trim angle
of the outboard motor in relation to the
transom.
2-8
E
402075*
402072*
402035*
q
25
25-3/30
25
q
402061*
EMD08010
SHALLOW WATER LEVER
(If equipped)
25
Lifting this lever will tilt the motor up partially to provide more clearance when
operating in shallow water.
EMD08110
SHALLOW WATER LEVER
(If equipped)
25-3/30
Pushing this lever down will tilt the motor
up partially to provide more clearance
when operating in shallow water.
EMD44010
TILT LOCK MECHANISM
(for Manual tilt model)
The tilt-lock mechanism is used to prevent reverse thrust from the propeller lifting the outboard motor when reversing.
To lock it, set the tilt-lock lever in the up
position. To release it, push the tilt-lock
lever down.
25-3/30
1 Tilt-lock lever
2-9
E
403023
q
25
25-3/30
EMU00156
TILT SUPPORT BAR
25
The tilt support bar 1 keeps the outboard
motor in the tilted up position.
EMD60210
TILT SUPPORT LEVER
25-3/30
To keep the outboard motor in the tiltedup position, lock the tilt support lever to
the swivel bracket.
403024
EMD62010
TOP COWLING LOCK LEVER
To remove the engine top cowling, push
the lock lever downward. Then lift off the
cowling. When replacing the cowling,
check to be sure it fits properly in the rubber seal. Then lock the cowling again by
moving the lever upward.
2-10
E
303013
EMD80010
WARNING SYSTEM
cC
Do not continue to operate the engine if
the warning device has activated. Consult
your Yamaha dealer if the problem cannot be located and corrected.
25
25-3/30
303014
EMU00170
OVERHEAT WARNING
This engine has an overheat warning
device. If the engine temperature rises too
high, the warning device will activate.
(
2); Included (—
Activation of
warning device
The engine speed
will automatically
decrease to about
2,000 r/min.
The overheat warning
indicator will come on.
The buzzer will sound.
If the warning system has been activated,
stop the engine and check the water inlet
for clogging.
); N/A
Tiller Remote
control control
model model
2
2
—
2-11
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