Yamaha 4AC Owner's manual

Brand: Yamaha

Model: 4AC

Category: Engine

Type: Owner's manual

This manual is also suitable for

Read this manual carefully before operating this

outboard motor.

OWNER’S MANUAL

4AC

6E0-28199-28-E0

U6E028E0.book Page 1 Tuesday, February 10, 2009 3:19 PM

Read this manual carefully before operating this outboard motor. Keep this

manual onboard in a waterproof bag when boating. This manual should stay

with the outboard motor if it is sold.

U6E028E0.book Page 1 Tuesday, February 10, 2009 3:19 PM

Important manual information

EMU25105

To the owner

Thank you for choosing a Yamaha outboard

motor. This Owner’s Manual contains infor-

mation needed for proper operation, mainte-

nance and care. A thorough understanding of

these simple instructions will help you obtain

maximum enjoyment from your new Yamaha.

If you have any question about the operation

or maintenance of your outboard motor,

please consult a Yamaha dealer.

In this Owner’s Manual particularly important

information is distinguished in the following

ways.

: This is the safety alert symbol. It is used

to alert you to potential personal injury haz-

ards. Obey all safety messages that follow

this symbol to avoid possible injury or death.

WARNING

EWM00781

A WARNING indicates a hazardous situa-

tion which, if not avoided, could result in

death or serious injury.

NOTICE

ECM00701

A NOTICE indicates special precautions

that must be taken to avoid damage to the

outboard motor or other property.

IP:

A TIP provides key information to make pro-

cedures easier or clearer.

Yamaha continually seeks advancements in

product design and quality. Therefore, while

this manual contains the most current product

information available at the time of printing,

there may be minor discrepancies between

your machine and this manual. If there is any

question concerning this manual, please con-

sult your Yamaha dealer.

To ensure long product life, Yamaha recom-

mends that you use the product and perform

the specified periodic inspections and mainte-

nance by correctly following the instructions in

the owner’s manual. Any damage resulting

from neglect of these instructions is not cov-

ered by warranty.

Some countries have laws or regulations re-

stricting users from taking the product out of

the country where it was purchased, and it

may be impossible to register the product in

the destination country. Additionally, the war-

ranty may not apply in certain regions. When

planning to take the product to another coun-

try, consult the dealer where the product was

purchased for further information.

If the product was purchased used, please

consult your closest dealer for customer re-

registration, and to be eligible for the specified

services.

IP:

The 4ACMH, 5CMH and the standard acces-

sories are used as a base for the explanations

and illustrations in this manual. Therefore

some items may not apply to every model.

EMU25121

4AC, 5C

OWNER’S MANUAL

1st Edition, February 2009

Any reprinting or unauthorized use

without the written permission of

Yamaha Motor Co., Ltd.

is expressly prohibited.

Printed in Japan

U6E028E0.book Page 1 Tuesday, February 10, 2009 3:19 PM

Table of contents

Safety information............................. 1

Outboard motor safety .................... 1

Propeller ............................................. 1

Rotating parts..................................... 1

Hot parts............................................. 1

Electric shock ..................................... 1

Engine shut-off cord (lanyard) ............ 1

Gasoline ............................................. 1

Gasoline exposure and spills ............. 1

Carbon monoxide ............................... 1

Modifications ...................................... 2

Boating safety ................................. 2

Alcohol and drugs............................... 2

Personal flotation devices .................. 2

People in the water............................. 2

Passengers ........................................ 2

Overloading ........................................ 2

Avoid collisions................................... 2

Weather.............................................. 3

Passenger training ............................. 3

Boating safety publications................. 3

Laws and regulations ......................... 3

General information .......................... 4

Identification numbers record.......... 4

Outboard motor serial number ........... 4

EC Declaration of Conformity

(DoC)............................................ 4

CE Marking ..................................... 4

C-Tick label ..................................... 4

Read manuals and labels................ 6

Warning labels.................................... 6

Specifications and requirements... 10

Specifications ................................ 10

Installation requirements ............... 11

Boat horsepower rating .................... 11

Mounting motor ................................ 11

Battery requirements..................... 11

Without a rectifier or Rectifier

Regulator ...................................... 11

Propeller selection ........................ 11

Start-in-gear protection ................. 12

Engine oil requirements ................ 12

Fuel requirements ......................... 12

Gasoline ........................................... 12

Muddy or acidic water ................... 13

Anti-fouling paint ........................... 13

Motor disposal requirements......... 13

Emergency equipment .................. 13

Components .................................... 14

Components diagram.................... 14

Fuel tank........................................... 15

Fuel tank........................................... 16

Fuel joint........................................... 16

Fuel gauge ....................................... 16

Fuel tank cap.................................... 16

Air vent screw................................... 16

Fuel cock .......................................... 16

Open................................................. 17

Tiller handle ...................................... 17

Gear shift lever ................................. 17

Throttle grip ...................................... 18

Throttle indicator............................... 18

Throttle friction adjuster .................... 18

Engine shut-off cord (lanyard) and

clip................................................. 19

Engine stop button ........................... 19

Choke knob ...................................... 19

Manual starter handle....................... 19

Steering friction adjuster................... 20

Trim rod (tilt pin) ............................... 20

Tilt support bar ................................. 20

Cowling lock lever(s) (turn type)....... 20

Installation ....................................... 21

Installation..................................... 21

Mounting the outboard motor ........... 21

Clamping the outboard motor........... 22

Operation ......................................... 24

First-time operation....................... 24

Breaking in engine............................ 24

Getting to know your boat ................ 24

Checks before starting engine ...... 24

Fuel level .......................................... 25

U6E028E0.book Page 1 Tuesday, February 10, 2009 3:19 PM

Table of contents

Remove cowling............................... 25

Fuel system ...................................... 25

Controls............................................ 25

Engine shut-off cord (lanyard).......... 25

Oil..................................................... 25

Engine .............................................. 26

Install cowling ................................... 26

Filling fuel and engine oil............... 26

Filling fuel for portable tank .............. 26

Filling fuel for built-in tank................. 27

Gasoline and oil mixing (100:1)........ 28

Operating engine........................... 30

Sending fuel (portable tank) ............. 30

Sending fuel ..................................... 31

Starting engine ................................. 32

Checks after starting engine ......... 33

Cooling water ................................... 33

Warming up engine ....................... 34

Choke start models .......................... 34

Checks after engine warm-up ....... 34

Shifting ............................................. 34

Stop switches ................................... 34

Shifting .......................................... 34

Stopping boat ................................ 35

Stopping engine ............................ 35

Procedure......................................... 35

Trimming outboard motor.............. 36

Adjusting trim angle for manual tilt

models .......................................... 37

Adjusting boat trim............................ 37

Tilting up and down ....................... 38

Procedure for tilting up

(manual tilt models)....................... 38

Procedure for tilting down

(manual tilt models)....................... 40

Shallow water................................ 40

Cruising in shallow water

(manual tilt models)....................... 40

Cruising in other conditions........... 41

Maintenance..................................... 42

Transporting and storing outboard

motor .......................................... 42

Clamp screw mounting models ........ 42

Storing outboard motor..................... 42

Procedure......................................... 43

Lubrication........................................ 44

Cleaning the outboard motor............ 44

Checking painted surface of motor... 44

Periodic maintenance ................... 44

Replacement parts ........................... 44

Severe operating conditions............. 44

Maintenance chart 1......................... 45

Maintenance chart 2......................... 47

Greasing ........................................... 47

Cleaning and adjusting spark plug ... 48

Checking fuel filter ............................ 48

Inspecting idling speed ..................... 49

Checking wiring and connectors ...... 49

Checking propeller ........................... 49

Removing propeller .......................... 50

Installing propeller ............................ 50

Changing gear oil ............................. 51

Cleaning fuel tank............................. 52

Inspecting and replacing anode(s) ... 53

Trouble Recovery............................ 54

Troubleshooting ............................ 54

Temporary action in emergency ... 57

Impact damage................................. 57

Starter will not operate ..................... 57

Emergency starting engine............... 58

Treatment of submerged motor .... 59

U6E028E0.book Page 2 Tuesday, February 10, 2009 3:19 PM

Safety information

EMU33622

Outboard motor safety

Observe these precautions at all times.

EMU36501

Propeller

People can be injured or killed if they come in

contact with the propeller. The propeller can

keep moving even when the motor is in neu-

tral, and sharp edges of the propeller can cut

even when stationary.

●Stop the engine when a person is in the wa-

ter near you.

●Keep people out of reach of the propeller,

even when the engine is off.

EMU33630

Rotating parts

Hands, feet, hair, jewelry, clothing, PFD

straps, etc. can become entangled with inter-

nal rotating parts of the engine, resulting in se-

rious injury or death.

Keep the top cowling in place whenever pos-

sible. Do not remove or replace the cowling

with the engine running.

Only operate the engine with the cowling re-

moved according to the specific instructions in

the manual. Keep hands, feet, hair, jewelry,

clothing, PFD straps, etc. away from any ex-

posed moving parts.

EMU33640

Hot parts

During and after operation, engine parts are

hot enough to cause burns. Avoid touching

any parts under the top cowling until the en-

gine has cooled.

EMU33650

Electric shock

Do not touch any electrical parts while starting

or operating the engine. They can cause

shock or electrocution.

EMU33671

Engine shut-off cord (lanyard)

Attach the engine shut-off cord so that the en-

gine stops if the operator falls overboard or

leaves the helm. This prevents the boat from

running away under power and leaving peo-

ple stranded, or running over people or ob-

jects.

Always attach the engine shut-off cord to a

secure place on your clothing or your arm or

leg while operating. Do not remove it to leave

the helm while the boat is moving. Do not at-

tach the cord to clothing that could tear loose,

or route the cord where it could become en-

tangled, preventing it from functioning.

Do not route the cord where it is likely to be

accidentally pulled out. If the cord is pulled

during operation, the engine will shut off and

you will lose most steering control. The boat

could slow rapidly, throwing people and ob-

jects forward.

EMU33810

Gasoline

Gasoline and its vapors are highly flam-

mable and explosive. Always, refuel accord-

ing to the procedure on page 30 to reduce the

risk of fire and explosion.

EMU33820

Gasoline exposure and spills

Take care not to spill gasoline. If gasoline

spills, wipe it up immediately with dry rags.

Dispose of rags properly.

If any gasoline spills onto your skin, immedi-

ately wash with soap and water. Change

clothing if gasoline spills on it.

If you swallow gasoline, inhale a lot of gaso-

line vapor, or get gasoline in your eyes, get

immediate medical attention. Never siphon

fuel by mouth.

EMU33900

Carbon monoxide

This product emits exhaust gases which con-

tain carbon monoxide, a colorless, odorless

gas which may cause brain damage or death

when inhaled. Symptoms include nausea,

dizziness, and drowsiness. Keep cockpit and

cabin areas well ventilated. Avoid blocking ex-

haust outlets.

U6E028E0.book Page 1 Tuesday, February 10, 2009 3:19 PM

Safety information

EMU33780

Modifications

Do not attempt to modify this outboard motor.

Modifications to your outboard motor may re-

duce safety and reliability, and render the out-

board unsafe or illegal to use.

EMU33740

Boating safety

This section includes a few of the many im-

portant safety precautions that you should fol-

low when boating.

EMU33710

Alcohol and drugs

Never operate after drinking alcohol or taking

drugs. Intoxication is one of the most common

factors contributing to boating fatalities.

EMU33720

Personal flotation devices

Have an approved personal flotation device

(PFD) on board for every occupant. Yamaha

recommends that you must wear a PFD

whenever boating. At a minimum, children

and non-swimmers should always wear

PFDs, and everyone should wear PFDs when

there are potentially hazardous boating condi-

tions.

EMU33731

People in the water

Always watch carefully for people in the wa-

ter, such as swimmers, skiers, or divers,

whenever the engine is running. When some-

one is in the water near the boat, shift into

neutral and stop the engine.

Stay away from swimming areas. Swimmers

can be hard to see.

The propeller can keep moving even when

the motor is in neutral. Stop the engine when

a person is in the water near you.

EMU33751

Passengers

Consult your boat manufacturer’s instructions

for details about appropriate passenger loca-

tions in your boat and be sure all passengers

are positioned properly before accelerating

and when operating above an idle speed.

Standing or sitting in non-designated loca-

tions may result in being thrown either over-

board or within the boat due to waves, wakes,

or sudden changes in speed or direction.

Even when people are positioned properly,

alert your passengers if you must make any

unusual maneuver. Always avoid jumping

waves or wakes.

EMU33760

Overloading

Do not overload the boat. Consult the boat ca-

pacity plate or boat manufacturer for maxi-

mum weight and number of passengers. Be

sure that weight is properly distributed ac-

cording to the boat manufacturers instruc-

tions. Overloading or incorrect weight

distribution can compromise the boats han-

dling and lead to an accident, capsizing or

swamping.

EMU33772

Avoid collisions

Scan constantly for people, objects, and other

boats. Be alert for conditions that limit your

visibility or block your vision of others.

Operate defensively at safe speeds and keep

a safe distance away from people, objects,

and other boats.

●Do not follow directly behind other boats or

waterskiers.

ZMU06025

U6E028E0.book Page 2 Tuesday, February 10, 2009 3:19 PM

Safety information

●Avoid sharp turns or other maneuvers that

make it hard for others to avoid you or un-

derstand where you are going.

●Avoid areas with submerged objects or

shallow water.

●Ride within your limits and avoid aggressive

maneuvers to reduce the risk of loss of con-

trol, ejection, and collision.

●Take early action to avoid collisions. Re-

member, boats do not have brakes, and

stopping the engine or reducing throttle can

reduce the ability to steer. If you are not

sure that you can stop in time before hitting

an obstacle, apply throttle and turn in anoth-

er direction.

EMU33790

Weather

Stay informed about the weather. Check

weather forecasts before boating. Avoid boat-

ing in hazardous weather.

EMU33880

Passenger training

Make sure at least one other passenger is

trained to operate the boat in the event of an

emergency.

EMU33890

Boating safety publications

Be informed about boating safety. Additional

publications and information can be obtained

from many boating organizations.

EMU33600

Laws and regulations

Know the marine laws and regulations where

you will be boating- and obey them. Several

sets of rules prevail according to geographic

location, but all are basically the same as the

International Rules of the Road.

U6E028E0.book Page 3 Tuesday, February 10, 2009 3:19 PM

General information

EMU25171

Identification numbers record

EMU25183

Outboard motor serial number

The outboard motor serial number is stamped

on the label attached to the port side of the

clamp bracket.

Record your outboard motor serial number in

the spaces provided to assist you in ordering

spare parts from your Yamaha dealer or for

reference in case your outboard motor is sto-

len.

EMU37290

EC Declaration of Conformity

(DoC)

This outboard motor conforms to certain por-

tions of the European Parliament directive re-

lating to machinery.

Each conformed outboard motor accompa-

nied with EC DoC.EC DoC contains the fol-

lowing information;

●Name of Engine Manufacture

●Model name

●Product code of model (Approved model

code)

●Code of conformed directives

EMU25203

CE Marking

Outboard motors affixed with this “CE”mark-

ing conform with the directives of; 98/37/EC,

94/25/EC - 2003/44/EC and 2004/108/EC.

EMU25213

C-Tick label

Engines affixed with this label conform to cer-

tain portion(s) of the Australian Radio Com-

munications Act.

1. Outboard motor serial number location

1. CE marking location

ZMU06040

U6E028E0.book Page 4 Tuesday, February 10, 2009 3:19 PM

General information

1. C-Tick label location

ZMU01697

U6E028E0.book Page 5 Tuesday, February 10, 2009 3:19 PM

General information

EMU33520

Read manuals and labels

Before operating or working on this motor:

●Read this manual.

●Read any manuals supplied with the boat.

●Read all labels on the outboard motor and the boat.

If you need any additional information, contact your Yamaha dealer.

EMU33831

Warning labels

If these labels are damaged or missing, contact your Yamaha dealer for replacements.

4AC, 5C

ZMU06033

U6E028E0.book Page 6 Tuesday, February 10, 2009 3:19 PM

General information

EMU35281

Contents of labels

The above warning labels mean as follows.

WARNING

EWM01691

Emergency starting does not have start-

in-gear protection. Ensure shift control is

in neutral before starting engine.

WARNING

EWM01681

●Keep hands, hair, and clothing away

from rotating parts while the engine is

running.

●Do not touch or remove electrical parts

when starting or during operation.

WARNING

EWM01671

●Read Owner’s Manuals and labels.

●Wear an approved personal flotation de-

vice (PFD).

●Attach engine shut-off cord (lanyard) to

your PFD, arm, or leg so the engine

stops if you accidentally leave the helm,

which could prevent a runaway boat.

ZMU05924

U6E028E0.book Page 7 Tuesday, February 10, 2009 3:19 PM

General information

WARNING

EWM01701

Gasoline is highly flammable and explo-

sive. Shut off engine before refueling.

Tighten tank cap and air vent screw when

not in use.

EMU33843

Symbols

The following symbols mean as follows.

Notice/Warning

Read Owner’s Manual

Hazard caused by continuous rotation

Electrical hazard

Remote control lever/gear shift lever operat-

ing direction, dual direction

ZMU05696

ZMU05664

ZMU05665

ZMU05666

ZMU05667

U6E028E0.book Page 8 Tuesday, February 10, 2009 3:19 PM

General information

Engine start/ Engine cranking

ZMU05668

U6E028E0.book Page 9 Tuesday, February 10, 2009 3:19 PM

Specifications and requirements

EMU31480

Specifications

IP:

“(AL)” stated in the specification data below

represents the numerical value for the alumi-

num propeller installed.

Likewise, “(SUS)” represents the value for

stainless steel propeller installed and “(PL)”

for plastic propeller installed.

EMU2821E

Dimension:

Overall length:

677 mm (26.7 in)

Overall width:

322 mm (12.7 in)

Overall height S:

1011 mm (39.8 in)

Overall height L:

1138 mm (44.8 in)

Transom height S:

444 mm (17.5 in)

Transom height L:

571 mm (22.5 in)

Weight (AL) S:

21.0 kg (46 lb)

Weight (AL) L:

21.5 kg (47 lb)

Performance:

Full throttle operating range:

4500–5500 r/min

Maximum output:

4ACMH 2.9 kW@5000 r/min (4

HP@5000 r/min)

5CMH 3.7 kW@5000 r/min (5

HP@5000 r/min)

Idling speed (in neutral):

1150 ±50 r/min

Engine:

Type:

2-stroke S

Displacement:

4ACMH 83.0 cm³

5CMH 103.0 cm³

Bore × stroke:

4ACMH 50.0 × 42.0 mm (1.97 × 1.65 in)

5CMH 54.0 × 45.0 mm (2.13 × 1.77 in)

Ignition system:

CDI

Spark plug (NGK):

B7HS

BR7HS

Spark plug gap:

0.6–0.7 mm (0.024–0.028 in)

Control system:

Tiller

Starting system:

Manual

Starting carburetion system:

Choke valve

Alternator output:

40/60 W

Drive unit:

Gear positions:

Forward-neutral-reverse

Gear ratio:

2.08 (27/13)

Trim and tilt system:

Manual tilt

Propeller mark:

Fuel and oil:

Recommended fuel:

Regular unleaded gasoline

Fuel tank capacity:

5CMH 12.0 L (3.17 US gal, 2.64 Imp.gal)

Fuel tank capacity (built in type):

2.8 L (0.74 US gal, 0.62 Imp.gal)

Recommended engine oil:

YAMALUBE 2-stroke outboard motor oil

Fuel:oil ratio:

U6E028E0.book Page 10 Tuesday, February 10, 2009 3:19 PM

Specifications and requirements

Regular gasoline:

100 :1

Lubrication:

Pre-mixed fuel and oil

Recommended gear oil:

Hypoid gear oil SAE#90

Gear oil quantity:

0.100 L (0.106 US qt, 0.088 Imp.qt)

Tightening torque for engine:

Spark plug:

25.0 Nm (2.55 kgf-m, 18.4 ft-lb)

Noise and vibration level:

Operator sound pressure level (ICOMIA

39/94 and 40/94):

4ACMH 81.6 dB(A) (*CE)

Vibration on tiller handle (ICOMIA 38/94):

4ACMH 3.4 m/s² (*CE)

EMU33554

Installation requirements

EMU33563

Boat horsepower rating

WARNING

EWM01560

Overpowering a boat can cause severe in-

stability.

Before installing the outboard motor(s), con-

firm that the total horsepower of your motor(s)

does not exceed the boats maximum horse-

power rating. See the boat’s capacity plate or

contact the manufacturer.

EMU33571

Mounting motor

WARNING

EWM01570

●Improper mounting of the outboard mo-

tor could result in hazardous conditions

such as poor handling, loss of control,

or fire hazards.

●Because the motor is very heavy, spe-

cial equipment and training is required

to mount it safely.

Your dealer or other person experienced in

proper rigging should mount the motor using

correct equipment and complete rigging in-

structions. For further information, see page

21.

EMU25694

Battery requirements

EMU25730

Without a rectifier or Rectifier Regula-

tor

NOTICE

ECM01090

A battery cannot be connected to models

that do not have a rectifier or Rectifier

Regulator.

If you wish to use a battery with the models

without a rectifier or Rectifier Regulator, install

an optional Rectifier Regulator.

Using a maintenance-free battery with the

above models can shorten the life of the bat-

tery significantly.

Install an optional Rectifier Regulator or use

accessories rated to withstand 18 volts or

higher with the above models. Consult your

Yamaha dealer for details on installing an op-

tional Rectifier Regulator.

EMU34192

Propeller selection

Next to selecting an outboard, choosing the

right propeller is one of the most important

purchasing decisions a boater can make. The

type, size, and design of your propeller have

a direct impact on acceleration, top speed,

fuel economy, and even engine life. Yamaha

designs and manufactures propellers for ev-

ery Yamaha outboard motor and every appli-

cation.

Your outboard motor came with a Yamaha

propeller chosen to perform well over a range

of applications, but there may be uses where

a different propeller would be more appropri-

ate.

U6E028E0.book Page 11 Tuesday, February 10, 2009 3:19 PM

Specifications and requirements

Your Yamaha dealer can help you select the

right propeller for your boating needs. Select

a propeller that will allow the engine to reach

the middle or upper half of the operating

range at full throttle with the maximum boat-

load. Generally, chose a larger pitch propeller

for a smaller operating load and a smaller

pitch propeller for a heavier load. If you carry

loads that vary widely, chose the propeller

that lets the engine run in the proper range for

your maximum load but remember that you

may need to reduce your throttle setting to

stay within the recommended engine speed

range when carrying lighter loads.

For instructions on propeller removal and in-

stallation, see page 49.

EMU25770

Start-in-gear protection

Yamaha outboard motors or Yamaha-ap-

proved remote control units are equipped with

start-in-gear protection device(s). This feature

permits the engine to be started only when it

is in neutral. Always select neutral before

starting the engine.

EMU25651

Engine oil requirements

If the recommended engine oil is not avail-

able, another 2-stroke engine oil with an

NMMA-certified TC-W3 rating may be used.

EMU36360

Fuel requirements

EMU36771

Gasoline

Use a good quality gasoline that meets the

minimum octane rating. If knocking or pinging

occurs, use a different brand of gasoline or

premium unleaded fuel. Yamaha recomends

that you use alcohol-free (see Gasohol) gas-

oline whenever possible.

NOTICE

ECM01981

●Do not use leaded gasoline. Leaded gas-

oline can seriously damage the engine.

●Avoid getting water and contaminants in

the fuel tank. Contaminated fuel can

cause poor performance or engine dam-

age. Use only fresh gasoline that has

been stored in clean containers.

Gasohol

There are two types of gasohol: gasohol con-

taining ethanol (E10) and that containing

methanol. Ethanol can be used if the ethanol

content does not exceed 10% and the fuel

meets the minimum octane ratings. All etha-

nol blends containing more than 10% ethanol

can cause fuel system damage or cause en-

gine starting and running problems. Yamaha

1. Propeller diameter in inches

2. Propeller pitch in inches

3. Type of propeller (propeller mark)

ZMU04604

123

Recommended engine oil:

YAMALUBE 2-stroke outboard motor

oil

Recommended gasoline:

Regular unleaded gasoline

U6E028E0.book Page 12 Tuesday, February 10, 2009 3:19 PM

Specifications and requirements

does not recommend gasohol containing

methanol because it can cause fuel system

damage or engine performance problems.

EMU36880

Muddy or acidic water

Yamaha strongly recommends that you have

your dealer install the optional chromium-plat-

ed water pump kit if you use the outboard mo-

tor in muddy or acidic water conditions.

However, depending on the model it might not

be required.

EMU36330

Anti-fouling paint

A clean hull improves boat performance. The

boat bottom should be kept as clean of marine

growth as possible. If necessary, the boat bot-

tom can be coated with an anti-fouling paint

approved for your area to inhibit marine

growth.

Do not use anti-fouling paint which includes

copper or graphite. These paints can cause

more rapid engine corrosion.

EMU36341

Motor disposal requirements

Never illegally discard (dump) the motor.

Yamaha recommends consulting the dealer

about discarding the motor.

EMU36351

Emergency equipment

Keep the following items onboard in case

there is trouble with the motor.

●A tool kit with assorted screwdrivers, pliers,

wrenches (including metric sizes), and

electrical tape.

●Waterproof flashlight with extra batteries.

●An extra engine shut-off cord (lanyard) with

clip.

●Spare parts, such as an extra set of spark

plugs.

Consult your Yamaha dealer for details.

U6E028E0.book Page 13 Tuesday, February 10, 2009 3:19 PM

Components

EMU2579M

Components diagram

IP:

* May not be exactly as shown; also may not be included as standard equipment on all models.

4AC

1. Air vent screw

2. Fuel tank cap

3. Top cowling

4. Cowling lock lever

5. Steering friction adjuster

6. Anti-cavitation plate

7. Propeller

8. Cooling water inlet

9. Trim rod

10.Clamp bracket

11.Clamp screw

12.Tiller handle

13.Throttle friction adjuster

14.Manual starter handle

15.Choke knob

16.Engine stop button/Engine shut-off switch

17.Restraint cable attachment

18.Tilt support bar

19.Fuel cock

20.Gear shift lever

U6E028E0.book Page 14 Tuesday, February 10, 2009 3:19 PM

Components

EMU25802

Fuel tank

If your model was equipped with a portable

fuel tank, its function is as follows.

WARNING

EWM00020

The fuel tank supplied with this engine is

its dedicated fuel reservoir and must not

be used as a fuel storage container. Com-

mercial users should conform to relevant

licensing or approval authority regula-

tions.

1. Air vent screw

2. Fuel tank cap

3. Top cowling

4. Cowling lock lever

5. Steering friction adjuster

6. Anti-cavitation plate

7. Propeller

8. Cooling water inlet

9. Trim rod

10.Clamp bracket

11.Clamp screw

12.Tiller handle

13.Throttle friction adjuster

14.Manual starter handle

15.Choke knob

16.Engine stop button/Engine shut-off switch

17.Restraint cable attachment

18.Tilt support bar

19.Gear shift lever

20.Fuel cock

21.Fuel tank*

U6E028E0.book Page 15 Tuesday, February 10, 2009 3:19 PM

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Yamaha 4AC Owner's manual

Brand: Yamaha

Model: 4AC

Category: Engine

Type: Owner's manual

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Yamaha 4AC Owner's manual

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