Yamaha 50A, 40A User Manual

OWNER’S MANUAL

40A
50A

U.S.A.Edition

LIT-18626-04-55

EMU01449

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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cC

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

40A/50A

OWNER'S MANUAL

©2001 by Yamaha Motor Corporation, USA

1st Edition, March 2001

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-18626-04-55

NOTE:

The 40MH, 50TR and their standard acces­sories are used as a base for the explana­tions and illustrations in this manual.
Therefore, some items may not apply to
every model.

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

Key number...........................................1-1

EMISSION CONTROL INFORMATION...1-2

SAFETY INFORMATION..........................1-3

1

2

IMPORTANT LABELS ..............................1-5

BASIC BOATING RULES .........................1-6

FUELING INSTRUCTIONS.....................1-10

Gasoline (petrol).................................1-11

Engine oil ............................................1-11

BATTERY REQUIREMENT ...................1-12

PROPELLER SELECTION .......................1-13

START-IN-GEAR PROTECTION ............1-14

3

4

5

6

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1

401012

904011

123

YAMAHA

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EMU00005

IDENTIFICATION NUMBERS

RECORD

EMU00007

OUTBOARD MOTOR SERIAL
NUMBER

YAMAHA MOTOR CO., LTD.
MADE IN JAPAN
PAYS D'ORIGINE JAPON

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

EMU00008

KEY NUMBER

If main key switch is equipped, your key
identification number is stamped on your
key as shown in the illustration. Record
this number in the space provided for ref­erence if you need a new key.

1 Key number

1-1

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EMISSION CONTROL INFORMATION

ENGINE FAMILY :

THIS ENGINE CONFORMS TO 2001 U.S. EPA REGULATIONS FOR MARINE SI ENGINES.
FELs :
SPARK PLUG :

IDLE SPEED :

rpm IN NEUTRAL

SPARK PLUG GAP (mm) :

g/kw-hr

Manufactured:

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000908

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000909

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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

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

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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 “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: [phone]

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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1-4

WARNING

This engine is equipped with a neutral starting device.
The engine will not start unless the shift control is
in neutral position.

6E0-83 627-41

WARNING

Be sure shift control is in neutral

before starting engine. (except 2HP)ê

Do not touch or remove electrical partsê

when starting or during operation.

Keep hands,hair,and clothes away from flywheelê

and other rotating parts while engine is running.

6A1-83 625-4 1

EMB30011

202016*

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IMPORTANT LABELS

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WARNING LABELS

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202015*

2

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504011*

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 “bur­dened” 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.

1-6

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102045

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.

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.

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)
side. This rule doesn’t apply if both of you

102046

Overtaking

If you are passing another vessel, you are
the “Give-Way” vessel. This means that
the other vessel is expected to maintain

1-7

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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 “fish­ing 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

1

11

A

1

11

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

22

22

22

AA

LL

LL

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 nu mbe r. Marks midchannel, pass on either
side. Letter has no lat era l signi fic anc e, used for

No n umb er. To pmo st ba nd r ed

-

pr e fe r re d

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 l ef t o f buoy. Letter has no la te ra l
signif icanc e, used for iden tification and locat ion
purpos es.

Red Light

Red or
White Light

OR

102052

tion. These markers are white with black
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.

cC

Use only new clean gasoline which has
been stored in clean containers and is not
contaminated with water or foreign mat­ter.

1-10

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EMU00018

GASOLINE (PETROL)

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. If unleaded gasoline is not avail­able, then leaded regular gasoline can be
used.

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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EMU00031

BATTERY REQUIREMENT

cC

Do not use the battery that does not
meet the specified capacity. If different
battery from the specification is used, the
electric system may perform poorly or be
overloaded, causing electrical system
damage.

Choose battery which meets the following
specifications for Electric start model.

Minimum cold crank performance
400 Amps at -17.8°C (0°F)
Minimum reserve capacity
85 minutes at 26.7°C (80°F)

1-12E1-13

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.

10-3/4x17-G

1 23

602011

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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 “SPECIFICA­TIONS” 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.

1-14

-MEMO-

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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

Multifunction tiller handle ...................2-4

Remote control .....................................2-7

Choke knob .........................................2-11

Recoil starter handle ..........................2-11

Steering friction adjusting screw......2-12

Trim angle adjusting rod ...................2-12

Shallow water lever ...........................2-13

Power trim/tilt switch .........................2-13

Warning indicator...............................2-14

Digital tachometer..............................2-15

Trim tab ...............................................2-18

Tilt lock mechanism ...........................2-19

Tilt support lever ................................2-20

Top cowling lock lever.......................2-20

WARNING SYSTEM ..............................2-21

Overheat warning...............................2-21

Oil level warning / oil filter

clogging warning ...............................2-22

1

2

3

4

5

6

101133*

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!3
!2

!1

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EMU01206

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MAIN COMPONENTS

1 Recoil starter handle
2 Multifunction tiller handle
3 Choke knob
4 Warning indicator lamp (Oil/Overheat)
5 Tilt lock lever
6 Transom clamp handle
7 Clamp bracket
8 Trim angle adjusting rod

9 Cooling water inlet
0 Propeller
q Trim tab (Anode)
w Anti-cavitation plate
e Anode
r Tilt support lever
t Shallow water lever
y Top cowling

* May not be exactly as shown; also may not

be included as standard equipment on all
models.

2-1

!4

!5

!3

!2

!1

!0
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EMU01206

E

MAIN COMPONENTS

1 Oil filler access cap
2 Warning indicator lamp
3 Clamp bracket
4 Battery lead
5 Anode
6 Cooling water inlet
7 Propeller
8 Trim tab (Anode)

9 Anti-cavitation plate
0 Anode
q Trim angle adjusting rod
w Tilt support lever
e Top cowling

* r Remote control box
* t Digital tachometer

* May not be exactly as shown; also may not

be included as standard equipment on all
models.

2-2

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902051*

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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)

EMC31010

Fuel hose joint

This connector is provided for connecting
or disconnecting fuel hose.

EMC41110

Fuel meter

This meter is on the fuel tank cap. It
shows current fuel quantity in the fuel
tank approximately.

EMC51010

Fuel tank cap

This cap is for filling fuel. To remove it,
turn it counterclockwise.

EMC61010

Air vent screw

This screw is on the fuel tank cap. To
loosen it, turn it counterclockwise.

2-3

501021

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501015

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EMU00075

MULTIFUNCTION TILLER HANDLE

The tiller handle centralized most of func­tions for the outboard motor operation.

1 Tiller handle
2 Gear shift lever
3 Throttle control grip
4 Throttle indicator
5 Throttle friction adjusting knob
6 Engine stop lanyard switch / Engine stop

button(If equipped)

EMU00079

Tiller handle

Moving the tiller handle sideways to
adjust the steering direction.

EMU00080

Gear shift lever

Turning the gear-shift lever forward (bow
side) engages the clutch with the forward
gear so that the boat moves ahead. Turn­ing the lever backward (stern side)
engages the reverse gear so that the boat
moves astern.

501025*

501022

1 Neutral
2 Forward
3 Reverse

EMU00081

Throttle control grip

The throttle control grip is on the tiller
handle. Turn the grip counterclockwise to
increase speed and clockwise to decrease
speed.

2-4

501023

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501042

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EMC40210

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

EMC64210

Throttle friction adjusting knob

A friction device in the tiller handle provid
resesistance to movement of the throttle
grip.
This is adjustable for operator preference.
An adjusting knob is located on the
left(port) side of tiller handle.

Resistance Knob/Screw
Increase Turn clockwise
Decrease Turn counterclockwise

When constant speed is desired, tighten
the adjusting knob to maintain the
desired throttle setting.

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Do not overtighten the friction adjusting
knob.
If there is too much resistance, it may be
difficult to move the throttle grip, which
could result in an accident.

EMC27110

Engine stop button
(for Manual start model)

Pushing this button opens the ignition cir­cuit and stops the engine.

501045*

2-5

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000980

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EMC28210

Engine stop lanyard switch

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.

w

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.

1 Lock-plate
2 Lanyard

2-6

E

701011*

w

q

e

r
t

y

u

R

N

F

q

w

e

r

t

y

u

u

t

r

y

701031

EMU00096*

REMOTE CONTROL

Both the shifter and the throttle are actu­ated by the remote control lever. Addi­tionally, the remote control also has the
electrical switches.

1 Remote control lever
2 Neutral interlock trigger
3 Neutral throttle lever
4 Main switch
5 Engine stop lanyard switch
6 Power trim and tilt switch (if equipped)
7 Throttle friction adjusting screw

EMC50010

Remote control lever

Moving the lever forward from the Neu­tral position engages Forward gear.
Pulling the lever back from Neutral
engages Reverse. The engine will contin­ue to run at idle until the lever is moved
about 35° (a detent can be felt). Moving
the lever farther opens the throttle, and
the engine will begin to accelerate.

1 Neutral
2 Forward
3 Reverse
4 Shift
5 Fully closed
6 Throttle
7 Fully open

2-7

N

701033*

w

q

ON

E

EMC50110

Neutral interlock trigger

To shift out of Neutral, the neutral inter­lock trigger of the remote control lever
must first be pulled up.

EMC50210

Neutral throttle lever

701036

STARTOFF

701021

To open the throttle without shifting into
either Forward or Reverse, place the
remote control lever in the Neutral posi­tion and lift the neutral throttle lever.

NOTE:

The neutral throttle lever will operate only
when the remote control lever is in Neu­tral. The remote control lever will operate
only when the neutral throttle lever is in
the closed position.

1 Fully open
2 Fully closed

EMC48110

Main switch

The main switch controls the ignition sys­tem; its operation is described below.

8 OFF

Electrical circuits switched off.
(The key can be removed.)

8 ON

Electrical circuits switched on.
(The key cannot be removed.)

8 START

Starter-motor will turn and start engine.
(When the key is released, it returns auto­matically to “ON”.)

2-8

E

UP
DN

701034

UP
DN

EMU01331

Power Trim/Tilt Switch

The power trim/tilt adjusts the motor
angle in relation to the transom. The
power trim/tilt switch is located on the
remote control lever grip. Pushing the
switch “UP” trims the motor up, then tilts
the motor up. Pressing the switch “DN”
tilts the motor down and trims the motor
down. When the switch button is
released, the motor will stop in its current
position.

NOTE:

Refer to the sections “ADJUSTING TRIM
ANGLE” and “TILTING UP/DOWN” in
Chapter 3 for instructions on usage.

2-9

E

000569

q

w

EMC28210

Engine stop lanyard switch

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.

w

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.

1 Lock-plate
2 Lanyard

2-10

E

305044*

EMC87011

Throttle friction adjusting screw

A friction device in the remote control box
provides resistance to movement of the
remote control lever.
This is adjustable for operator preference.
An adjusting screw is located at the front
of the remote control box.

701035

Resistance Screw

Increase Turn clockwise

Decrease Turn counterclockwise

w

Do not overtighten the friction adjusting
screw.
If there is too much resistance, it may be
difficult to move the lever, which could
result in an accident.

EMC42210

CHOKE KNOB

40 MH

Pulling out this knob (setting it to ON)
supplies a rich mixture required to start
the engine.

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.

209015

2-11

E

404015*

408015

EMD00011*

STEERING FRICTION ADJUSTING
SCREW

40MH

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.

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.

404011*

2-12

302013*

DN

UP

412012

E

EMD08110

SHALLOW WATER LEVER
(If equipped)

Pushing this lever down will tilt the motor
up partially to provide more clearance
when operating in shallow water.

EMU01125

POWER TRIM/TILT SWITCH

The power trim/tilt adjusts the motor
angle in relation to the transom. The
power trim/tilt switch is located on the
side of the bottom engine cowling. Push­ing the switch “UP” trims the motor up,
then tilts the motor up. Pressing the
switch “DN” tilts the motor down and
trims the motor down. When the switch
button is released, the motor will stop in
its current position.

w

Use the power trim/tilt switch located on
the bottom engine cowling only when
the boat is at a complete stop with the
engine off. Attempting to use the cowl­ing-mounted power trim/tilt switch while
the boat is moving could increase the risk
of falling overboard and could distract
the operator, increasing the risk of colli­sion with another boat or an obstacle.

NOTE:

Refer to the section “Adjusting Trim
Angle” and “Tilting Up/Down” for instruc­tions on usage.

2-13

303016

q

q

303012*

E

EMU00120

WARNING INDICATOR

If the engine develops a condition which
is cause for warning, the indicator on the
front of the bottom cowling lights up.
The three indicators mounted on the bot­tom cowling also indicate level of the
engine oil. Refer to the section “WARN­ING SYSTEM” for details of this function.

1 Warning indicator

2-14

q

t

w

u

y

e

r

001078

001082

E

EMU01614

DIGITAL TACHOMETER

This gauge contains the tachometer, trim
meter, hour meter, oil level indicator, and
the overheat warning indicator.

1 Tachometer
2 Trim meter
3 Hour meter
4 Oil level indicator
5 Overheat warning indicator
6 Set button
7 Mode button

NOTE:

All segments of the display will light
momentarily after the main switch is
turned on and will return to normal there­after.

EMU00136

Tachometer

This meter shows the engine speed.

001049

2-15

001050

001087

E

EMU01109

Trim Meter

This meter shows the trim angle of your
outboard motor.

NOTE:

8 Memorize the trim angles that work

best for your boat under different condi­tions. Adjust the trim angle to the
desired setting by operating the power
trim and tilt switch.

8 If the trim angle of your motor exceeds

the trim operating range, the top seg­ment on the trim meter display will start
to blink.

EMU01620

Hour Meter

This meter shows the number of hours
the engine has been run. It can be set to
show the total number of hours or the
number of hours for the current trip. The
display can also be turned on and off.
8 Changing the display format

Pressing the MODE button changes the
display format in the following circular
pattern:
Total hours - Trip hours - Display off

8 Resetting the trip hours

Simultaneously pressing the SET and
MODE buttons for more than 1 second
while the trip hours are displayed resets
the trip counter to 0 (zero).

NOTE:

The total number of hours the engine has
been run cannot be reset.

2-16

001051

q

q

E

EMU00138

Oil-Level Indicator

This indicator shows the engine oil level.
If the oil level falls below the lower limit,
the warning indicator will start to blink.
Refer to the sections “FILLING OIL” and
“OIL LEVEL WARNING” for details.

1 Oil-level indicator

cC

Do not operate the engine without oil.
Serious engine damage will occur.

EMU01553

Overheat Warning Indicator

If the engine temperature rises too high,
the warning indicator will start to blink.
Refer to “OVERHEAT WARNING” for
details.

1 Overheat warning indicator

001052

cC

Do not continue to operate the engine if a
warning device has activated. If neces­sary, refer to the “TROUBLESHOOTING”
section in this manual. Consult your deal­er if the problem cannot be located and
corrected.

2-17

E

EMD04011*

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.

q

w

A

B

603011

1 Trim tab
2 Bolt
3 Cap (If equipped)

Boat tends to The rear end of trim tab
veer

To the left Turn the left(port side),
(port side) “A” in the figure

To the right Turn the right(starboard
(starboard side)

side),”B” in the figure

cC

The trim tab also serves as an anode to
protect the engine from electroche mical
corrosion.
Never paint the trim tab as it will become
ineffective as an anode.

2-18

402036

q

q

402011*

E

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.

1 Tilt-lock lever

EMD45010

TILT LOCK MECHANISM
(for Hydro-tilt model)

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 Lock
position. To release it, place the tilt-lock
lever in the Tilt position.

1 Tilt-lock lever

NOTE:

The tilt-lock mechanism on the hydro-tilt
model can be used to keep the outboard
motor at a slightly tilted angle for shallow
water cruising. Refer to CRUISING IN
SHALLOW WATER for the correct opera­tion.

2-19

403024

q

403011

301013*

E

EMD60010

TILT SUPPORT LEVER

Power trim & tilt/Hydro tilt model

To keep the outboard motor in the tilted­up position, lock the tilt support lever to
the clamp bracket.

EMD60210

TILT SUPPORT LEVER

40MH

To keep the outboard motor in the tilted­up position, lock the tilt support lever to
the swivel bracket.

EMD62011

TOP COWLING LOCK LEVER

To remove the engine top cowling, turn
the lock lever. 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.

1 Top cowling lock lever

2-20

701054

001053

303012

E

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.

EMD82012*

OVERHEAT WARNING

This engine has an overheat warning
device.
If the engine temperature rises too high,
the warning device will activate.

(

2); Included (—); N/A

Warning device
activation

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.

Tiller Remote

control control

model model

2 2

1

*

2 2

2

*

—

*

2

1

605021

*1.Digital tachometer
*2.40MH

2-21

001094

303012

303022

E

EMD84012*

OIL LEVEL WARNING / OIL FILTER
CLOGGING WARNING

This engine has an oil level warning sys­tem.
If oil level falls below lower limit, the
warning device will activate.

(

2); Included (—); N/A

Warning device
activation

The engine speed
will automatically
decrease to about
2,000 r/min.

The oil level warning
indicator will come on.

The buzzer will sound.

If the warning system has been activated,
stop the engine and check for the cause.

NOTE:

The warning for oil filter clogging is simi­lar to the warnings for low oil level and
overheating.
For easy troubleshooting, it is advisable
to check for engine overheating first, then
oil level and finally oil filter clogging.

Tiller Remote

control control

model model

2 2

2 2

—

2

1 Oil filter

q

213024

2-22

-MEMO-

E

E

EMF00010

Chapter 3

OPERATION

INSTALLATION ........................................3-1

Mounting the outboard motor............3-2

Clamping the outboard motor ............3-4

FILLING FUEL AND ENGINE OIL ............3-5

Filling fuel..............................................3-5

Filling oil ................................................3-6

PRE-OPERATION CHECKS......................3-9

Operation after a long period of

storage.................................................3-10

BREAKING IN (RUNNING IN)

ENGINE ...................................................3-11

STARTING ENGINE ...............................3-13

WARMING UP ENGINE .........................3-18

SHIFTING ................................................3-19

Forward ...............................................3-19

Reverse................................................3-20

STOPPING ENGINE ...............................3-21

1

2

3

4

TRIMMING OUTBOARD MOTOR.........3-23

Adjusting trim angle ..........................3-24

TILTING UP/DOWN ...............................3-27

CRUISING IN SHALLOW

WATER...........................................3-32, 3-34

CRUISING IN OTHER CONDITIONS.....3-35

Cruising in salt water .........................3-35

Cruising in turbid water.....................3-35

5

6

E

EMF10010

INSTALLATION

cC

Incorrect engine height or obstructions to
smooth water flow (such as the design or
condition of the boat or accessories such
as transom ladders/depth finder trans­ducers) can create airborne water spray
while the boat is cruising. Severe engine
damage may result if the motor is operat­ed continuously in the presence of air­borne water spray.

NOTE:

During water testing check the buoyancy
of the boat, at rest, with its maximum
load. Check that the static water level on
the exhaust housing is low enough to pre­vent water entry into the powerhead,
when water rises due to waves when the
outboard is not running.

3-1

E

104011

q

EMF12012

MOUNTING THE OUTBOARD
MOTOR

w

Improper mounting of the outboard motor
could result in hazardous conditions such
as poor handling, loss of control, or fire
hazards. Observe the following:

8

The information presented in this sec­tion is intended as reference only. It is
not possible to provide complete
instructions for every possible
boat/motor combination. Proper mount­ing depends in part on experience and
the specific boat/motor combination.

8 Your dealer or other person experi-

enced in proper rigging should mount
the motor. If you are mounting the
motor yourself, you should be trained
by an experienced person. [permanent
mounted type]

8 Your dealer or other person experi-

enced in proper outboard motor
mounting should show you how to
mount your motor. [portable type]

Mount the outboard motor on the center
line (keel line) of the boat, and ensure that
the boat itself is well balanced. Otherwise,
the boat will be hard to steer. For boats
without a keel or which are asymmetrical,
consult your dealer.

1 Center line (keel line)

3-2

E

104014

w

Overpowering a boat may cause severe
instability. Do not install an outboard
motor with more horsepower than the
maximum rating on the capacity plate of
the boat. If the boat does not have a capac­ity plate, consult the boat manufacturer.

EMU01299

Mounting Height

To run your boat at optimum efficiency,
the water-resistance (drag) of the boat
and outboard motor must be made as lit­tle as possible. The mounting-height of
the outboard motor greatly affects the
water-resistance. If the mounting-height
is too high, cavitation tends to occur, thus
reducing the propulsion; and if the pro­peller tips cut the air, the engine speed
will rise abnormally and cause the engine
to overheat. If the mounting-height is too
low, the water-resistance will increase
and thereby reduce engine efficiency.
Mount the engine so that the anti-cavita­tion plate is in alignment with the bottom
of the boat .

NOTE:

8 The optimum mounting height of the

outboard motor is affected by the
boat/motor combination. Test runs at
different heights can help determine the
optimum mounting height.

8 Refer to the section “TRIMMING OUT-

BOARD MOTOR” for instructions on
setting the trim angle of the outboard.

3-3

409011

q

410012

409012*

E

EMU01318

CLAMPING THE OUTBOARD MOTOR

40MH

1) Place the outboard on the transom so
that it is positioned as close to the
center as possible. Tighten the tran­som clamp screws evenly and secure­ly. Check the clamp-screws for tight­ness occasionally during operation of
the motor as they can work loose due
to engine vibration.

w

Loose clamp screws could allow the
motor to move on the transom or fall off
the transom. This could cause loss of
control and serious injury. Make sure the
transom screws are tightened securely.
Occasionally check the screws for tight­ness during operation.

2) An engine restraint cable or chain
should be used. Attach one end to
the engine restraint cable attachment
point and the other to a secure
mounting point on the boat. Other­wise, the engine could be completely
lost if it accidentally falls off the tran­som.
Secure the clamp bracket to the tran­som with the bolts provided with the
outboard. For details, consult your
dealer.

w

Avoid using bolts, nuts or washers other
than those contained in the engine pack­aging. If used, they must be of at least
the same quality of material and strength
and must be tightened securely. After
tightening, test run the engine and check
their tightness.

1 Motor mounting parts

3-4

902055

E

EMF20010

FILLING FUEL AND

ENGINE OIL

EMF30011

FILLING FUEL

1) Remove the fuel tank cap.

2) Fill the fuel tank carefully.

3) Close the cap securely after refueling.
Wipe up any spilled fuel.

Fuel tank capacity:

Refer to SPECIFICATIONS, page 4-1.

EMU01019

Ring Free Fuel Additive

Gasoline is a precise blend of many differ­ent substances, each chosen to give cer­tain characteristics. Gasoline blends have
been changing in recent years in
response to concerns about pollution and
resulting emissions regulations. One of
the most obvious changes has been the
elimination of lead from most fuels.

As gasoline has changed, the amount of
additives such as aromatics and oxy­genates has increased. These additives
are important for the engines in passen­ger cars, but they can have detrimental
effects in marine engines, because of
increased deposits in the combustion
chamber. When enough deposits collect,
piston rings begin sticking. Performance
drops and engine wear increases dramati­cally.

While many additives available may
reduce deposits, Yamaha recommends
the use of Ring Free Fuel Additive, avail­able from your Yamaha dealer. Ring Free
has repeatedly proven its ability to clean
combustion deposits from inside the
engine, notably the critical piston-ring­land area, and fuel system components.
Follow product labeling for use instruc­tions.

3-5

E

EMF32011

FILLING OIL
(for Precision blend system model)

This engine uses the YAMAHA PRECI­SION BLEND SYSTEM, which provides
superior lubrication by ensuring the prop­er oil ratio for all operating conditions. No
fuel premixing is needed (except during
break-in/running-ins). Simply pour gaso­line into the fuel tank and oil into the oil
tank.

Convenient indicator segments indicate
condition of the oil supply. Refer to oil
warning system.
To fill the engine oil into the engine oil
tank, proceed as follows:

w

Do not add gasoline (Petrol) into the oil
tank. Fire or explosion could result.

Engine oil tank capacity:

Refer to “SPECIFICATION”, page 4-1.

3-6

w

q

203013*

203014

E

EMF34010

Procedure
Manual start model

1) Remove the top cowling.

2) Open the oil tank filler cap by pulling
the tab.

3) Slowly fill the engine oil into the
engine oil tank.

4) After filling, replace the cap securely.

5) Replace the top cowling securely.

1 Engine oil tank
2 Oil tank filler cap

EMF34110

Procedure
Electric start model

1) Turn the oil filler access cap on top of
the top cowling counterclockwise and
open it.

2) Open the oil tank filler cap by pulling
a tab on the cap.

q

203015

w

203016*

3) Slowly fill the engine oil into the
engine oil tank.

4) After filling, replace the all caps
securely.

1 Oil filler access cap
2 Oil tank filler cap

3-7

EMD33010

Oil level indicator
Manual start model

The various oil-level system functions are as follows:

Oil level warning lamp RemarksEngine oil tank

more than 200 cm3(0.21 US qt,

0.181 Imp qt)

OFF

E

No refilling necessary.

Red

ON

EMD33110

200 cm3or less (0.21 US qt,

0.181 Imp qt)

Oil level indicator
Electric start model

The various oil-level system functions are as follows:

Oil level warning

indicator

(Digital tachometer)

Oil level warning

indicator lamp

(Analog tachome-

ter/Bottom cowling)

Green

Yellow

Red

Engine oil tank

more than 4 50 cm
(0.48 US qt,

0.40 Imp qt)

from 450 cm
(0.48 US qt,

0.40 Imp qt)
down to 200 cm
(0.21 US qt,

0.18 Imp qt)

200 cm
(0.21 US qt,

0.18 Imp qt) or less

Buzzer sounds in remote con­trol box and engine speed is
limited to about 2,000 r/min to
help conserve oil.
Check oil filter for clogging.
Add oil.

3

No refilling necessary.

3

3

Add oil,
refer to oil filling.

3

Buzzer sounds in
remote control box and
engine speed is limited
to about 2,000 r/min to
help conserve oil.
Check oil filter for
clogging.

Remarks

3-8

E

EMF40012

PRE-OPERATION CHECKS

w

If any item in the pre-operation check is
not working properly, have it inspected
and repaired before operating the out­board motor. Otherwise, an accident
could occur.

EMF41110

Fuel

8 Check to be sure you have plenty of fuel

for your trip.

8 Make sure there are no fuel leaks or

gasoline fumes.

8 Check fuel line connections to be sure

they are tight.

8 Be sure the fuel tank is positioned on a

secure, flat surface, and that the fuel
hose is not twisted or flattened, or likely
to contact sharp objects.

EMF42110

Oil

8 Check to be sure you have plenty of oil

for your trip.

EMF43010

Controls

8 Check throttle, shift, and steering for

proper operation before starting the
engine.

8 The controls should work smoothly,

without binding or unusual free play.

8 Look for loose or damaged connec-

tions.

8 Check operation of the starter and stop

switches when the outboard motor is in
the water.

3-9

E

212011*

EMF43510

Engine

8 Check the engine and engine mounting.
8 Look for loose or damaged fasteners.
8 Check the propeller for damage.

cC

Do not start the engine out of water.
Overheating and serious engine damage
can occur.

EMF44010

OPERATION AFTER A LONG PERIOD
OF STORAGE (for Precision blend
system model)

When operating the engine after a long
period (12 months) of storage, proceed as
follows:

1) Use a 50 : 1 gasoline-oil mixture to
start the engine.

2) Start the engine. Leave it idling.

w

8 Do not touch or remove electrical parts

when starting or during operation.

8 Keep hands, hair, and clothes away

from flywheel and other rotating parts
while engine is running.

3) Watch for oil flowing through the oil
feed pipes. After any air in the oil
lines has been expelled, YAMAHA
PRECISION BLEND SYSTEM should
supply oil normally. If no oil has
begun flowing after 10 minutes of
idling, consult your Yamaha dealer.

cC

When operating the engine after a long
period of storage, be sure to take the
above steps; otherwise, engine seizure
may occur.

3-10

E

EMF50112

BREAKING IN (RUNNING IN)

ENGINE

Your new engine requires a period of
break-in (running-in) to allow mating sur­faces of moving parts to wear-in evenly.
Correct break-in (running-in) will help
ensure proper performance and longer
engine life.

cC

8 Failure to follow the break-in (running-

in) procedure may result in reduced
engine life or even severe engine dam­age.

8 Premix fuel must be used during break-

in (running-in) in addition to oil in the
Precision Blend System.

Break-in (running-in) time:10 hours

Break-in (running-in) premix ratio

Gasoline (petrol) : Engine oil =50 : 1

3-11

E

EMU00227

Run the engine under load (in gear with a
propeller installed) as follows.

1) First 10 minutes:
Run the engine at the lowest possi­ble-speed. A fast idle in neutral is
best.

2) Next 50 minutes:
Do not exceed half throttle (approxi­mately 3,000 r/min). Vary engine
speed occasionally. If you have an
easy-planing boat, accelerate at full
throttle onto plane, then immediately
reduce the throttle to 3,000 r/min or
less.

3) Second hour:
Accelerate at full throttle onto plane,
then reduce engine speed to three­quarter throttle (approximately 4,000
r/min). Vary engine speed occasional­ly. Run at full throttle for one minute,
then allow about 10 minutes of opera­tion at three-quarter throttle or less to
let the engine cool.

4) Third through tenth hours:
Avoid operating at full throttle for
more than 5 minutes at a time. Let the
engine cool between full-throttle runs.
Vary engine speed occasionally.

5) After the first 10 hours:
Operate the engine normally. Use
straight gasoline (petrol) in the fuel
tank; YAMAHA PRECISION BLEND
SYSTEM provides proper lubrication
for normal operation.

3-12

902025

902053

304034

E

EMU01147

STARTING ENGINE

w

8 Before starting the engine, make sure

that the boat is tightly moored and that
you can steer clear of any obstructions.
Be sure there are no swimmers in the
water near you.

8 When the air vent screw is loosened,

gasoline (petrol) vapor will be released.
Gasoline (petrol) is highly flammable,
and its vapors are flammable and
explosive. Refrain from smoking, and
keep away from open flames and
sparks while loosening the air vent
screw.

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.

902061

1) If there is an air vent screw on the fuel
tank cap, loosen it 2 or 3 turns.

2) If there is a fuel joint on the motor,
firmly connect the fuel line to the
joint. Then firmly connect the other
end of the fuel line to the joint on the
fuel tank.

NOTE:

During engine operation place the tank
horizontally, or fuel cannot be drawn into
the engine.

3) Squeeze the primer bulb with the out­let end up until you feel it become
firm.

3-13

501023

E

501024

N

EMU00854

PROCEDURE FOR TILLER CONTROL
MODEL

4) Place the gear-shift lever in the neu­tral position.

NOTE:

The start-in-gear protection device pre­vents the engine from starting except
when in Neutral.

5) Place the throttle control grip in the
“START” position.

6) Attach the engine stop switch lanyard
to a secure place on your clothing, or
your arm or leg. Then, install the lock
plate on the other end of the lanyard
in the engine stop switch.

w

8 Attach the engine stop switch lanyard

000976

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 where 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.

3-14

305043*

209015

E

EMF63110

Manual start model

7) Pull out the choke knob completely.

NOTE:

It is not necessary to use the choke when
restarting a warm engine.

8) To start the engine, pull the starter
handle slowly until you feel resis­tance. Then, give a strong pull
straight out to crank the engine.

NOTE:

If the engine fails to start on the first pull,
repeat the above procedure. If the engine
still will not start after several attempts,
refer to the section on troubleshooting.

9) After the engine starts, do not let go
of the starter handle. Return it slowly
to its home position before releasing
it.

10) After using the choke, set the choke
knob to the home position.

NOTE:

If the choke knob is left pulled out, the
engine will stall.

11) Return the throttle control grip slowly
to its home position so that the
engine does not stall.

3-15

E

000293

N

701015

EMF65010

PROCEDURE FOR REMOTE
CONTROL MODEL

4) Place the remote control lever in the
Neutral position.

NOTE:

8 The start-in-gear protection device pre-

vents the engine from starting except
when in Neutral.

8 It is not necessary to open the free

accelerator lever or Neutral throttle
lever while starting.

5) Attach the engine stop switch lanyard
to a secure place on your clothing, or
your arm or leg. Then, install the lock
plate on the other end of the lanyard
in the engine stop switch.

w

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 where it could become entan­gled, preventing 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.

6) Turn the main switch to “ON”.

3-16

E

ON

START

OFF

701022

EMF63910

Electric start model

7) Turn the main switch to “START”, and
hold it for a maximum of 5 seconds.

8) Immediately the engine starts, release
the main switch to return it to “ON”.

cC

8 Do not turn the main switch to

“START” when the engine is running.

8 Do not keep the starter-motor turning

for more than 5 seconds with the main
switch in the “START” position. If the
engine does not start within 5 seconds,
return the main switch to “ON”, wait
10 seconds, and then crank the engine
again. (If the starter-motor is run con­tinuously for more than 5 seconds, the
battery will rapidly become exhausted
and it will be impossible for it to start
the engine.)

3-17

E

309014

EMG00210

WARMING UP ENGINE

1) Before beginning operation, allow the
engine to warm up at idling speed for
3 minutes. (Failure to do this will
shorten engine life.)

2) Check for a steady flow of water from
the cooling-water pilot hole.

cC

A continuous flow of water from the pilot
hole shows that the water pump is
pumping water through the cooling pas­sages. If water is not flowing out of the
pilot hole at all times while the engine is
running, do not continue to run the
engine. Overheating and serious damage
could occur. Stop the engine and check
to see if the water inlet on the lower cas­ing is blocked. If the problem cannot be
found and corrected, consult your Yama­ha dealer.

NOTE:

After the engine starts, warm-up opera­tion is automatically controlled by the
Prime Start system. Automatic control is
cancelled if the throttle is opened more
than halfway.

3-18

N

F

501026

701043

N

F

501012

E

EMG20111

SHIFTING

w

Before shifting, make sure there are no
swimmers or obstacles in the water near
you.

cC

To change the shifting position from for­ward to reverse or vice-versa, close the
throttle first so that the engine idles (or
runs at low speeds).

EMG22310

FORWARD

Tiller control model

1) Place the throttle control grip in the
fully closed position.

2) Turn the gear-shift lever quickly and
firmly from Neutral to Forward.

Remote control model

Pull up the neutral interlock trigger if
equipped and move the remote control
lever quickly and firmly from Neutral to
Forward.

3-19

E

402051

402011*

EMU01326

REVERSE

w

When operating in Reverse, go slowly. Do
not open the throttle more than half. Oth­erwise, the boat may become unstable,
which could result in loss of control and
an accident.

1) Place the throttle control grip in the
fully closed position (for Tiller control
model).

2) Check that the tilt-lock lever (for Man­ual tilt/Hydro-tilt model) is in the
locked position.

Tiller control model

N

R

3) Turn the gear-shift lever quickly and
firmly from Neutral to Reverse.

501031

Remote control model

N

R

3) Pull up the neutral interlock trigger if
equipped and move the remote con­trol lever quickly and firmly from Neu­tral to Reverse.

701044

3-20

E

501045*

EMG38010

STOPPING ENGINE

Let it cool off for a few minutes at idle or
low speed first. Stopping the engine
immediately after operating at high speed
is not recommended.

EMG35210

PROCEDURE

Button switch equipped model

1) Push and hold the engine stop switch
(If button switch equipped on the
switch) until the engine comes to a
complete stop.

NOTE:

The engine can also be stopped by
pulling the lanyard from the engine stop
switch.

2) After stopping the engine, disconnect
the fuel line from the motor.

304036

3) Tighten the air vent screw on the fuel
tank cap after stopping the engine, if
it is equipped.

902052

3-21

ON

START

OFF

701023

304036

E

EMG35310

PROCEDURE

Main switch equipped model

1) Turn the main switch to “OFF”.

NOTE:

The engine can also be stopped by
pulling the lanyard from the engine stop
switch (then turning the main switch to
“OFF”).

2) If the fuel joints are provided, discon­nect the fuel line from the motor after
stopping the engine.

3) Tighten the air vent screw on the fuel
tank cap after stopping the engine, if
it is equipped.

4) Remove the key if the boat will be left
unattended.

902052

3-22

E

000862

q

EMU01412

TRIMMING OUTBOARD

MOTOR

The trim angle of the outboard motor
helps determine the position of the bow
of the boat in the water. The correct trim
angle will help improve performance and
fuel economy while reducing strain on the
engine. The correct trim angle depends
upon the combination of boat, engine,
and propeller. Correct trim is also affected
by variables such as the load in the boat,
sea conditions, and running speed.

w

Excessive trim for the operating condi­tions (either trim up or trim down) can
cause boat instability and can make
steering the boat more difficult. This
increases the possibility of an accident. If
the boat begins to feel unstable or is hard
to steer, slow down and/or readjust the
trim angle.

NOTE:

Refer to the section “ADJUSTING TRIM
ANGLE” for instructions on usage.

1 Trim operating angle

3-23

404015

q

q

404011*

E

ADJUSTING TRIM ANGLE

EMU00951

Manual tilt model

There are 4 or 5 holes provided in the
clamp bracket to adjust the outboard
motor trim angle.

1) Stop the engine.

2) Remove the trim angle adjusting rod
1 from the clamp bracket while tilting
the motor up slightly.

3) Reposition the rod in the desired hole.

To raise the bow (“trim-out”), move the
rod away from the transom.
To lower the bow (“trim-in”), move the
rod toward the transom.
Make test runs with the trim set to differ­ent angles to find the position that works
best for your boat and operating condi­tions.

w

8 Stop the engine before adjusting the

trim angle.

8 Use care to avoid being pinched when

removing or installing the rod.

8 Use caution when trying a trim position

for the first time. Increase speed gradu­ally and watch for any signs of instabili­ty or control problems. Improper trim
angle can cause loss of control.

NOTE:

The outboard motor trim angle can be
changed approximately 4 degrees by
shifting the trim adjusting-rod one hole.

3-24

E

UP
DN

701034

UP
DN

q

EMU01401

Power Trim/Tilt Model

w

8 Be sure all people are clear of the out-

board motor when adjusting the
trim/tilt angle, also be careful not to
pinch any body parts between the drive
unit and clamp bracket.

8 Use caution when trying a trim position

for the first time. Increase speed gradu­ally and watch for any signs of instabili­ty or control problems.

8 Use the power trim/tilt switch located

on the bottom engine cowling (if
equipped) only when the boat is at a
complete stop with the engine off.

The outboard motor trim angle can be
adjusted operating the power trim/tilt
switch 1.

To raise the bow (“trim-out”), push the
switch UP.

To lower the bow (“trim-in”), push the
switch DN.

Make test runs with the trim set to differ­ent angles to find the position that works
best for your boat and operating condi­tions.

NOTE:

To adjust the trim angle while the boat is
moving, use the power trim and tilt
switch located on the remote control
device or tiller handle, if so equipped.

3-25

105011

q

w

E

EMG62010

Bow up

When the boat is on plane, a bow-up atti­tude result in less drag, greater stability
and efficiency. This is generally when the
keel line of the boat is up about 3 to 5
degrees. When trimmed out, the boat
may have more tendency to steer to one
side or the other. Compensate for this as
you steer. The trim tab can also be adjust­ed to help offset this effect.

Too much trim-out puts the bow of the
boat too high in the water. Performance
and economy are decreased because the
hull of the boat is pushing the water and
there is more air drag.
Excessive trim-up can cause the propeller
to ventilate, which reduces performance
further. When trimmed-out too much, a
boat may “porpoise” (hop in the water),
which could throw the operator and pas­sengers overboard.

EMG62110

Bow down

When the bow of the boat is down, it is
easier to accelerate from a standing start
onto plane.

e

105013

105015

Too much trim-in causes the boat to
“plow” through the water, decreasing
fuel economy and making in hard to
increase speed.
Operating with excessive trim-in at higher
speeds also makes the boat unstable.
Resistance at the bow is greatly
increased, heightening the danger of
“bow steering” and making operation dif­ficult and dangerous.

1 Bow up
2 Bow down
3 Optimum angle

3-26

E

000817

EMH10110

TILTING UP/DOWN

If the engine will be stopped for some
time, or if the boat is moored in shallows,
the engine should be tilted up to protect
the propeller and casing from damage by
collision with obstructions, and also to
reduce salt corrosion.

cC

8 Before tilting the motor, follow the pro-

cedures under “STOPPING ENGINE”.
Never tilt the motor while the engine is
running. Severe damage from over­heating can result.

8 Do not tilt up the engine by pushing

the steering handle as this could break
the handle.

8 Keep the power unit higher than the

propeller at all times. Otherwise, water
can run into the cylinder, causing dam­age.

w

Be sure all people are clear of the out­board motor when adjusting the tilt
angle, also be careful not to pinch any
body parts between the drive unit and
engine bracket.

w

Leaking fuel is a fire hazard. Disconnect
the fuel line if the engine will be tilted for
more than a few minutes. Otherwise, fuel
may leak. (If the fuel connector is provid­ed on the motor.)

3-27

304036

402035

E

EMG63010

PROCEDURE FOR TILTING UP

Manual tilt model

1) Remove the fuel-line connection from
the motor. (If the fuel connector is
provided on the motor.)

2) Place the tilt-lock lever in Release.

3) Hold the rear of the top cowling with
one hand, tilt the engine up, and turn
the tilt-support lever to the locked
position and support the engine.

403024

3-28

304036

402011*

E

EMG63110

PROCEDURE FOR TILTING UP

Hydro-tilt model

1) Remove the fuel-line connection from
the motor.

2) Place the tilt-lock lever in the release
position.

3) Hold the rear of the top cowling with
one hand, tilt the engine up, and turn
the tilt-support lever toward you and
support the engine.

403011

3-29

304036

UP
DN

E

EMG63210

PROCEDURE FOR TILTING UP

Power trim and tilt model

1) Remove the fuel-line connection from
the motor.

2) Push the power trim and tilt switch
“UP” until the outboard has tilted up

UP
DN

701034

completely.

UP

DN

302013*

403011

3) Turn the tilt-support lever toward
engine bracket and support the
engine.

w

After tilting the engine, be sure to sup­port it with the tilt-support lever. Other­wise, the engine could fall back down
suddenly if oil in the power trim and tilt
unit should lose pressure.

3-30

E

411035

EMG73210*

PROCEDURE FOR TILTING DOWN

Manual tilt model

1) Return the tilt support lever tilting up
the engine slightly.

2) Tilt down the engine.

EMG64011

PROCEDURE FOR TILTING DOWN

Hydro-tilt model

1) Release the tilt support lever holding
the rear of the top cowling with one
hand.

2) Tilt the engine down.

EMG64110

PROCEDURE FOR TILTING DOWN

Power trim and tilt model

1) Push the power trim and tilt switch
“UP” until the engine is supported by
the tilt rod.

2) Release the tilt-support lever.

3) Push the power trim and tilt switch
“DN” (Down) to lower the engine to
the desired position.

3-31

E

000832

EMG70011*

CRUISING IN SHALLOW

WATER

Manual tilt model

The outboard motor can be tilted up par­tially to allow operation in shallow water.

w

8 Place the gear shift in the Neutral posi-

tion before using the shallow water
cruising system.

8 Run the boat at the lowest possible

speed when using the shallow water
cruising system. The tilt-lock mecha­nism does not work while the shallow
water cruising system is being used.
Hitting an underwater obstacle could
cause the engine to lift out of the
water, resulting in loss of control.

8 Use extra care when operating in

reverse. Too much reverse thrust can
cause the engine to lift out of the
water, increasing the chance of acci­dent and personal injury.

8 Return the engine to its normal posi-

tion as soon as the boat is back in
deeper water.

cC

Place the gear-shift in the Neutral posi­tion before using the shallow water cruis­ing system.

3-32

E

412012

EMG71410

N

501024

412022

PROCEDURE

1) Place the gear shift lever in the neu­tral position.

2) Push the shallow water lever down to
the release position.

3) For setting the outboard motor at the
partially tilted position, slightly tilt up
the engine until the plate turns com­pletely

4) To return the engine to the normal
position, put the engine in Neutral,
then slightly tilt up the engine. Set the
tilt-lock lever and shallow water lever
to the lock position and slowly tilt the
engine down.

3-33

402011

000832

E

EMG70311

CRUISING IN SHALLOW

WATER

Hydro tilt model

The engine can be tilted up partially to
allow operation in shallow water.

w

8 Place the gear shift in the Neutral posi-

tion before setting for the shallow
water cruising.

8 Return the engine to its normal posi-

tion as soon as the boat is back in
deeper water.

cC

Do not tilt up the outboard motor up to
the cooling water inlet of the lower unit
is higher than the water surface when
setting for and cruising in shallow water.
Otherwise severe damage from overheat­ing can result.

EMG71710

PROCEDURE

1) Place the gear in the neutral position.

2) Pull the tilt-lock lever up to the Tilt
position.

3) Slightly tilt up the engine to the
desired position and push the tilt-lock
lever down to the Lock position.

4) To return the engine to the normal
position, pull the tilt-lock lever up to
the Tilt position and slowly tilt the
engine down.

5) Push the tilt-lock lever down to the
Lock position.

3-34

E

EMH60010

CRUISING IN OTHER

CONDITIONS

CRUISING IN SALT WATER

After operating in salt water, wash out the
cooling-water passages with fresh water
to prevent them from becoming clogged­up with salt deposits.

NOTE:

Refer to cooling system flushing instruc­tions in “TRANSPORTING AND STORING
OUTBOARD MOTOR”.

CRUISING IN TURBID WATER

It is strongly recommended that the
optional chromium-plated water-pump kit
be installed if the outboard is to be used
in turbid (muddy) water conditions.

3-35

E

EMK00010

Chapter 4

MAINTENANCE

SPECIFICATION DATA.............................4-1

TRANSPORTING AND STORING

OUTBOARD MOTOR ...............................4-3

Trailering outboard motor...................4-3

Storing outboard motor ......................4-4

PERIODIC MAINTENANCE......................4-9

Replacement parts ...............................4-9

Maintenance chart..............................4-10

Greasing ..............................................4-11

Cleaning and adjusting spark plug...4-13

Checking fuel system.........................4-15

Cleaning fuel filter ..............................4-16

Adjusting idling speed.......................4-17

Checking water drain under

engine oil tank ....................................4-18

Replacing fuse ...................................4-19

Checking wiring and connectors ......4-19

Exhaust leakage..................................4-19

Water leakage .....................................4-19

Checking power trim and

tilt system ...........................................4-20

Checking propeller .............................4-21

Changing gear oil ...............................4-23

Cleaning fuel tank...............................4-24

Inspecting and replacing anode .......4-25

Checking battery.................................4-26

Checking bolts and nuts ....................4-29

Motor exterior.....................................4-29

Coating the boat bottom ...................4-29

1

2

3

4

5

6

EMK10011*

SPECIFICATION DATA

Model

Item

DIMENSIONS

8Overall Length mm (in.)
8Overall Width mm (in.)
8Overall Height S/L/X mm (in.)
8Transom height S/L/X mm (in.)
8Weight S/L/X kg (lb.)

PERFORMANCE

8Full throttle operating range r/min
8Maximum output kW (HP)
8Idling speed r/min

ENGINE

8Engine type

Number of cylinder
Displacement cm

× stroke mm (in.)

Bore

8Ignition system
8Spark plug NGK

Spark plug gap mm (in.)

8Control system
8Starting system
8Battery capacity V-AH

Minimum cold crank performance Amps a-17.8°C (0°F)
Minimum reserve capacity minutes at 26.7°C (80°F)

8Alternator output V-Amp (W)
8Starting carburetion system

DRIVE UNIT

8Gear positions

Gear ratio

8Trim and tilt system
8Propeller mark

FUEL AND OIL

8Fuel

Fuel tank capacity L (US gal, Imp gal)

8Recommended engine oil

Oil tank capacity L (US qt, Imp qt)

8Lubrication
8Fuel/oil ratio
8Recommended gearcase oil

Gear oil quantity cm

TIGHTNING TORQUE

8Spark plug N•m (kgf•m, lb•ft)
8Propeller nut N•m (kgf•m, lb•ft)

Unit 40MHA

3

(cu.in.)

3

(US oz, Imp oz)

4-1

E

1,281 (50.4)
349 (13.7)
—/1,350 (53.1)/—
—/533 (21.0)/—
—/77.5 (171)/—

4,500–5,500

29.4 (40) at 5,000 r/min
750–850

2-stroke, L
3
698 (42.6)

67.0 × 66.0 (2.6 × 2.6)
C.D.I system
B7HS-10

0.9–1.0 (0.035–0.039)
Tiller control
Manual start
—
—
—
12-(80)
Choke valve start system

Forward-Neutral-Reverse

1.85 (24/13)
Manual tilt
G

Regular-unleaded gasoline (petrol) (P.O.N.: minimum 86)
—
YAMALUBE 2 STROKE OUTBOARD OIL, or an equivalent
TC-W3 certified outboard oil
Engine: 1.5 (1.6, 1.3)
Remote: —
YAMAHA PRECISION BLEND SYSTEM
—
Hypoid gear oil (SAE 90)
430 (14.5, 15.1)

25 (2.5, 18)
35 (3.5, 25)

E

40TRA 50TRA

646 (25.4)
360 (14.2)
—/1,319 (51.9)/1,464 (57.6)
—/533 (21.0)/647 (25.5)
—/88 (194)/91.5 (202)

4,500–5,500

29.4 (40) at 5,000 r/min
750–850

2-stroke, L
3
698 (42.6)

67.0 × 66.0 (2.6 × 2.6)
C.D.I system
B7HS-10

0.9–1.0 (0.035–0.039)
Remote control
Electric start
12-70–100
400
85
12-6
Prime start system

670 (26.4)
360 (14.2)
—/1,319 (51.9)/—
—/533 (21.0)/—
—/88.0 (194)/—

4,500–5,500

36.8 (50) at 5,000 r/min
750–850

2-stroke, L
3
698 (42.6)

67.0 × 66.0 (2.6 × 2.6)
C.D.I system
B8HS-10

0.9–1.0 (0.035–0.039)
Remote control
Electric start
12-70–100
400
85
12-6
Prime start system

50EJRA

670 (26.4)
360 (14.2)
—
—
—

4,500–5,500

36.8 (50) at 5,000 r/min
750–850

2-stroke, L
3
698 (42.6)

67.0 × 66.0 (2.6 × 2.6)
C.D.I system
B8HS-10

0.9–1.0 (0.035–0.039)
Remote control
Electric start
12-70–100
400
85
12-6
Prime start system

Forward-Neutral-Reverse

1.85 (24/13)
Power trim and tilt
G

Regular-unleaded gasoline (P.O.N.: minimum 86)

—
YAMALUBE 2 STROKE OUTBOARD OIL, or an
equivalent TC-W3 certified outboard oil
Engine: 1.5 (1.6, 1.3)
Remote: —
YAMAHA PRECISION BLEND SYSTEM
—
Hypoid gear oil (SAE 90)
430 (14.5, 15.1)

25 (2.5, 18)
35 (3.5, 25)

Forward-Neutral-Reverse

1.85 (24/13)
Power trim and tilt
G

Regular-unleaded gasoline (P.O.N.: minimum 86)

—
YAMALUBE 2 STROKE OUTBOARD OIL, or an
equivalent TC-W3 certified outboard oil
Engine: 1.5 (1.6, 1.3)
Remote: —
YAMAHA PRECISION BLEND SYSTEM
—
Hypoid gear oil (SAE 90)
430 (14.5, 15.1)

25 (2.5, 18)
35 (3.5, 25)

—
—
Hydro tilt (Hydraulic tilt)
—

Regular-unleaded gasoline (P.O.N.: minimum 86)

—
YAMALUBE 2 STROKE OUTBOARD OIL, or an
equivalent TC-W3 certified outboard oil
Engine: 1.5 (1.6, 1.3)
Remote: —
YAMAHA PRECISION BLEND SYSTEM
—
—
—

25 (2.5, 18)
—

4-2

E

EMU01369*

TRANSPORTING AND

STORING OUTBOARD MOTOR

w

Leaking fuel is a fire hazard. When trans­porting and storing the outboard motor,
close the air vent screw and fuel cock to
prevent fuel from leaking.

TRAILERING OUTBOARD MOTOR

The motor should be trailered and stored
in the normal running position. If there is
insufficient road clearance in this position,
then trailer the motor in the tilt position
using a motor support device such as a
transom saver bar.

cC

Do not use the tilt support lever/knob
when trailering the boat. The outboard
motor could shake loose from the tilt
support and fall. If the motor can not be
trailered in the down position, use an
additional support device to secure it in
the up position.

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8 Never get under the lower unit while it

is tilted, even if a motor support bar is
used. Severe injury could occur if the
outboard accidentally falls.

8 USE CARE when transporting fuel tank,

whether in a boat or car.
DO NOT fill fuel container to maximum
capacity.
Gasoline will expand considerably as it
warms up and can build up pressure in
the fuel container. This can cause fuel
leakage and a potential fire hazard.

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EMK16010

STORING OUTBOARD MOTOR

When storing your Yamaha outboard for
prolonged periods of time, (2 months or
longer), several important procedures
must be performed to prevent expensive
damage. This is especially important for
your Precision Blend equipped outboard
due to the lean oil ratios used at idle prior
to shutting the engine off for the season.
It is advisable to have your outboard ser­viced by an authorized Yamaha dealer
prior to storage. However, the following
procedures can be performed by you, the
owner, with a minimum of tools.

EMK21010

Filling Fuel Tank

Fill the fuel tank with fresh fuel and add
one ounce of “Yamaha Fuel Conditioner
and Stabilizer” (Part No. LUB-FUELC-12-

00) to each gallon of fuel.

NOTE:

The use of “Yamaha Fuel Conditioner and
Stabilizer” eliminates the need to drain
the fuel system. Consult your Yamaha
dealer or other qualified mechanic if the
fuel system is to be drained instead.

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EMK22511

Flushing Cooling System and Fogging
Engine

Cooling system flushing is essential to
prevent the cooling system from clogging
up with salt, sand, or dirt. In addition, fog­ging of the engine is mandatory to pre­vent expensive engine damage due to
rust. Perform the flushing and fogging at
the same time.

8 Flushing in a water tank

1) Remove the engine top cowling and
silencer cover.

2) Install the outboard motor on the
water tank, and fill the tank with fresh
water to above the level of the anti­cavitation plate.

1 Water surface
2 Lowest water level

cC

If the fresh water level is below the level
of the anti-cavitation plate, or if the water
supply is insufficient, engine seizure may
occur.

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8 Do not tough or remove electrical parts

when starting or during operation.

8 Keep hands, hair and clothes away

from flywheel and other rotating parts
while engine is running.

3) Run the engine at a fast idle for 10~15
minutes.

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605014

4) Just prior to turning off the engine,
quickly spray “Yamaha Stor-Rite
Engine Fogging Oil” (Part No. LUB­STRRT-12-00) alternately into each
carburetor. When properly done, the
engine will smoke excessively and
almost stall.

8 Flushing with the flushing attachment

1) Remove the top cowling and silencer
cover. Remove the propeller.

2) Install a flushing attachment to the
lower unit. (Flushing attachment
available from your Yamaha dealer).

cC

Avoid running the outboard at high
speed while on the flushing attachment,
or overheating could occur.

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8 Do not touch or remove electrical parts

when starting or during operation.

8 Keep hands, hair and clothes away

from flywheel and other rotating parts
while engine is running.

3) Run the engine at a fast idle for 10~15
minutes.

4) Just prior to turning off the engine,
quickly spray “Yamaha Stor-Rite
Engine Fogging Oil” (Part No. LUB­STRRT-12-00) alternately into each
carburetor. When properly done, the
engine will smoke excessively and
almost stall.

5) Remove the flushing attachment and
wipe off any excess water.

6) Install the silencer cover and top
cowling. Install the propeller.

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EMK26112

Lubrication

1) Remove the spark plugs, and spray a
10 second spray of “Yamaha Stor­Rite Engine Fogging Oil” into each
cylinder. Grease the spark plug
threads and reinstall the spark plugs
and torque to proper specification.
(Refer to “CLEANING AND ADJUST­ING SPARK PLUG”.)

2) Turn the engine over with the stop
lanyard disconnected to work the fog­ging oil into the piston rings.

3) Fill the oil tanks. This prevents the for­mation of condensation. For models
with a remote tank, it may be neces­sary to manually override the control
unit to completely fill the engine main
tank. (Refer to Oil level warning sec­tion).

4) Change the lower unit oil. (Refer to
“CHANGING GEAR OIL”). Inspect the
oil for the presence of water which
indicates a leaky seal. Seal replace­ment should be performed by an
authorized Yamaha dealership prior
to use.

5) Grease all grease fittings. (Refer to
“GREASING”)

EMK27011

Cleaning and Anti-corrosion Measure

1) Wash down the exterior of the out­board with fresh water and dry off
completely.

2) Spray the engine’s exterior with
“Yamaha Silicone Protectant” (Part
No. LUB-SILCNE-13-00).

3) Wax the cowling with a non-abrasive
wax such as “Yamaha Silicone Wax”
(Part No. ACC-11000-15-02).

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901015

UPPER LEVEL

LOWER LEVEL

EMK29010

Battery Care

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Battery electrolyte is poisonous and dan­gerous, causing severe burns, etc. It con­tains sulfuric acid. Avoid contact with
skin, eyes, or clothing.
Antidote:
EXTERNAL; Flush with water.
INTERNAL; Drink large quantities of
water or milk. Follow with milk of mag­nesia, beaten egg, or vegetable oil. Call
physician immediately.
EYES; Flush with water for 15 minutes
and get prompt medical attention.
Batteries produce explosive gases: Keep
sparks, flame, cigarettes, etc. away. Ven­tilate when charging or using in a closed
space. Always wear eye protection when
working near batteries.
KEEP OUT OF REACH OF CHILDREN.

NOTE:

Batteries vary among manufacturers.
Therefore the following procedures may
not always apply. Consult your battery
manufacturer’s instructions.

1) Disconnect and remove the battery
from the boat. Always disconnect the
black negative lead first to prevent the
risk of shorting.

2) Clean the battery casing and termi­nals. Fill each cell to the upper level
with distilled water.

3) Store the battery on a level surface in
a cool, dry, well-ventilated place out
of direct sunlight.

4) Once a month, check the specific
gravity of the electrolyte and recharge
as required to prolong battery life.

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EMK32110

PERIODIC MAINTENANCE

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Be sure to turn off the engine when you
perform maintenance unless otherwise
specified. If the owner is not familiar with
machine servicing, this work should be
done by a Yamaha dealer or other quali­fied mechanic.

A service manual is available for purchase
through a Yamaha dealer for owners who
have the mechanical skills, tools, and
other equipment necessary to perform
maintenance not covered by this owner’s
manual.

EMK33011

REPLACEMENT PARTS

If replacement parts are necessary, use
only genuine Yamaha parts or equiva­lents of the same type and of equivalent
strength and materials. Any part of inferi­or quality may malfunction, and the
resulting loss of control could endanger
the operator and passengers.
Yamaha genuine parts and accessories
are available from a Yamaha dealer.

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EMK30114*

MAINTENANCE CHART

Frequency of maintenance operations may be adjusted according to the operating con­ditions, but the following table gives general guidelines.

The mark (

The mark (1) indicates work to be carried out by your Yamaha dealer.

Item

Carburetor Cleaning 1 1 1 —
Fuel filter Cleaning ● ● ● 4-16
Fuel system Inspection ● ● 4-15
Fuel tank *2 Cleaning ● 4-24

Throttle link Inspection/Adjustment 1 —
Idling speed Inspection/Adjustment ● ● 4-17

Spark plug

Oil tank water drain Cleaning ● ● ● 4-18

Oil pump Inspection/Adjustment 1 —

Power trim and tilt system
Wiring & Connector Inspection/Reconnect ● ● ● 4-19
Exhaust leakage Inspection ● ● ● 4-19
Water leakage Inspection ● ● ● 4-19
Grease points Greasing ● 4-11
Gear oil Change ● ● 4-23
Bolts & Nuts Retightening ● ● ● 4-29
Cowling clamp Inspection ● —
Anode Inspection ● ● 4-25
Propeller Inspection ● ● ● 4-21
Motor exterior Inspection ● ● ● 4-29

Cooling water passages*3

Battery Inspection

●) indicates the check-ups which you may carry out yourself.

Interval

Cleaning/Adjustment/

Replacement

*1

Inspection ● ● ● 4-20

Cleaning ● ● 4-5

Initial Every

10 hours

● (every

month)

50 hours

(3 months)

● ● ● 4-13

100 hours

(6 months)

200 hours

(1 year)

Refer
page

4-26

*1. for Power trim and tilt model
*2. If equipped
*3. When operating in salt water, turbid or muddy water, the engine should be flushed with clean

water after each use.

4-10

EMU00366

GREASING

Yamaha marine grease
(Water resistant grease)

E

4-11

EMU00366

GREASING

Yamaha marine grease
(Water resistant grease)

E

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EMU01202

CLEANING AND ADJUSTING SPARK
PLUG

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When removing or installing a spark plug,
be careful not to damage the insulator. A
damaged insulator could allow external
sparks, which could lead to explosion or
fire.

The spark plug is an important engine
component and is easy to inspect. The
condition of the spark plug can indicate
something about the condition of the
engine. For example, if the center elec­trode porcelain is very white, this could
indicate an intake air leak or carburetion
problem in that cylinder. Do not attempt
to diagnose any problems yourself.
Instead, take the outboard motor to a
Yamaha dealer. You should periodically
remove and inspect the spark plug
because heat and deposits will cause the
spark plug to slowly break down and
erode. If electrode erosion becomes
excessive, or if carbon and other deposits
are excessive, you should replace the
spark plug with another of the correct
type.

Standard spark plug:
Refer to “SPECIFICATIONS”, page 4-1.

Before fitting the spark plug, measure the
electrode gap with a wire thickness
gauge; adjust the gap to specification if
necessary.

Spark plug gap:
Refer to “SPECIFICATIONS”, page 4-1.

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When fitting the plug, always clean the
gasket surface and use a new gasket.
Wipe off any dirt from the threads and
screw in the spark plug to the correct
torque.

Spark plug torque:
Refer to “SPECIFICATIONS”, page 4-1.

NOTE:

If a torque-wrench is not available when
you are fitting a spark plug, a good esti­mate of the correct torque is 1/4 to 1/2 a
turn past finger-tight. Have the spark plug
adjusted to the correct torque as soon as
possible with a torque-wrench.

Initial of spark plug

I.D. mark

B 21 mm (13/16 in.)

C/BK 16 mm (5/8 in.)

D 18.3 mm (23/32 in.)

1 Spark plug gap
2 Spark plug I.D. mark (NGK)

Plug wrench size

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EMK38010

CHECKING FUEL SYSTEM

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Gasoline (petrol) and its vapors are highly
flammable and explosive. Keep away
from sparks, cigarettes, flames or other
sources of ignition.

Check the fuel line for leaks, cracks, or
malfunctions. If any problem is found, it
should be repaired immediately by Yama­ha dealer or other qualified mechanic.

Checking points

8 Fuel system parts leakage.
8 Fuel hose joint leakage.
8 Fuel hose cracks or other damage.
8 Fuel connector leakage.

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Leaking fuel can result in fire or explo­sion.

8 Check for fuel leakage regularly.
8 If any fuel leakage is found, the fuel

system must be repaired by a qualified
mechanic. Improper repairs can make
the outboard unsafe to operate.

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EMK50011

CLEANING FUEL FILTER

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Gasoline (petrol) is highly flammable, and
its vapors are flammable and explosive.
8 If you have any question about properly

doing this procedure, consult your
Yamaha dealer.

8 Do not perform this procedure on a hot

or running engine. Allow the engine to
cool.

8 There will be fuel in the fuel filter. Keep

away from sparks, cigarettes, flames or
other sources of ignition.

8 This procedure will allow some fuel to

spill. Catch fuel in a rag. Wipe up any
spilled fuel immediately.

8 The fuel filter must be reassembled

carefully with O-ring, filter cup, and
hoses in place. Improper assembly can
result in a fuel leak, which could result
in a fire or explosion hazard.

To clean the fuel filter:

1) Remove the nut holding the fuel filter
assembly if equipped.

2) Unscrew the filter cup, catching any
spilled fuel in a rag.

3) Remove the filter element, and wash
it in solvent.
Allow it to dry. Inspect the filter ele­ment and O-ring to make sure they
are in good condition. Replace them if
necessary.

4) Reinstall the filter element in the cup.
Make sure the O-ring in position in
the cup. Firmly screw the cup onto
the filter housing.

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5) Attach the filter assembly to the
bracket with that the fuel hoses are
attached to the filter assembly.

6) Run the engine and check the filter
and lines for leaks.

1 Filter element
2 O-ring
3 Filter cap
4 Filter housing

EMK54110

ADJUSTING IDLING SPEED

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8 Do not touch or remove electrical parts

when starting or during operation.

8 Keep hands, hair and clothes away

from flywheel and other rotating parts
while engine is running.

cC

This procedure must be performed while
the outboard motor is in the water. A
flushing attachment or test tank can be
used.

Procedure
NOTE:

A diagnostic tachometer should be used
for this procedure.

1) Start the engine and allow it to warm
up fully in Neutral until it is running
smoothly. If the outboard is mounted
on a boat, be sure the boat is tightly
moored.

4-17