Yamaha 15C User Manual (2024)

OWNER’S MANUAL

9.9C 15C

U.S.A.Edition

LIT-18626-05-34

EMU01448

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!

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YOUR SAFETY IS INVOLVED!

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A CAUTION indicates special precautions that must be taken to avoid damage to the outboard motor.

NOTE:

A NOTE provides key information to make procedures easier or clearer.

* Yamaha continually seeks advance-

ments in product design and quality. Therefore, while this manual contains the most current product information available at the time of printing, there may be minor discrepancies between your machine and this manual. If there is any question concerning this manual, please consult your Yamaha dealer.

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Failure to follow WARNING instructions could result in severe injury or death to the machine operator, a bystander, or a person inspecting or repairing the out­board motor.

EMU01446

9.9C, 15C

OWNER'S MANUAL

©2003 by Yamaha Motor Corporation, USA

1st Edition, March 2003

All rights reserved.

Any reprinting or unauthorized use

without the written permission of

Yamaha Motor Corporation, USA

is expressly prohibited.

Printed in Japan

P/N LIT-18626-05-34

NOTE:

The 15MH and its standard accessories are used as a base for the explanations and illustrations in this manual. There­fore, some items may not apply to every model.

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.

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EMB00010

Chapter 1

GENERAL

INFORMATION

IDENTIFICATION NUMBERS

RECORD ....................................................1-1

Outboard motor serial number...........1-1

EMISSION CONTROL INFORMATION...1-2

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

1

2

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

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

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

Gasoline ..............................................1-11

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

PROPELLER SELECTION .......................1-12

START-IN-GEAR PROTECTION ............1-13

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401012

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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

1-1

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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

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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.

SAFETY

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 co*ckpit and cabin areas well ventilated. Avoid blocking exhaust outlets.

8 Check throttle, shift, and steering for

proper operation before starting the engine.

8 Attach the engine stop switch lanyard

to a secure place on your clothing, or your arm or leg while operating. If you accidentally leave the helm, the lanyard will pull from the switch, stopping the engine.

8 Know the marine laws and regulations

where you will be boating - and obey them. Refer to the “RULES OF THE ROAD” section for basic boating rules.

8 Stay informed about the weather.

Check weather forecasts before boating. Avoid boating in hazardous weather.

8 Tell someone where you are going:

leave a Float Plan with a responsible person. Be sure to cancel the Float Plan when you return.

8 Use common sense and good judgment

when boating. Know your abilities, and be sure you understand how your boat handles under the different boating conditions you may encounter. Operate within your limits, and the limits of your boat. Always operate at safe speeds, and keep a careful watch for obstacles and other traffic.

8 Always watch carefully for swimmers

during the engine operation.

8 Stay away from swimming areas. 8 When a swimmer is in the water near

you shift into neutral and shut off the engine.

1-3

8 Be informed about boating safety. Addi-

tional publications and information can be obtained from many organizations, including the following:

United States Coast Guard

Consumer Affairs Staff (G-BC) Office of Boating, Public, and Consumer Affairs U.S. Coast Guard Headquarters Washington, D.C. 20593-0001 Boating Safety Hotline: 1-800-368-5647

National Marine Manufacturers

Association (NMMA)

401 N. Michigan Ave. Chicago, Il 60611

Marine Retailers Association of America

155 N. Michigan Ave. Chicago, Il 60601

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EMB30010

IMPORTANT LABELS

WARNING LABELS

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

WARNING

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6E0-83627-41

1-5

EMB40010

BASIC BOATING RULES

(Rules of the road)

Just as there are rules which apply when you are driving on streets and high ways, there are waterway rules which apply when you are driving your boat. These rules are used internationally, and are also enforced by the United States Coast Guard and local agencies. You should be aware of these rules, and follow them whenever you encounter another vessel on the water.

Several sets of rules prevail according to geographic location, but are all basically the same as the International Rules of the Road. The rules presented here in your Owner’s Manual are condensed, and have been provided for your convenience only. Consult your local U.S. Coast Guard Aux­iliary or Department of Motor Vehicles for a complete set of rules governing the waters in which you will be using your boat.

STEERING AND SAILING RULES AND SOUND SIGNALS

Whenever two vessels on the water meet one another, one vessel has the right-of­way; it is called the “stand-on” vessel. The vessel which does not have the right­of-way is called the “give-way” or “bur- dened” vessel. These rules determine which vessel has the right-of-way, and what each vessel should do.

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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 circ*mstances, which may render a departure from the above rules necessary in order to avoid immediate danger.’

In other words, follow the standard rules except when a collision will occur unless both vessels try to avoid each other. If that is the case, both vessels become “Give-Way” vessels.

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RULES WHEN ENCOUNTERING VESSELS

There are three main situations which you may encounter with other vessels which could lead to a collision unless the Steer­ing Rules are followed:

Meeting

(you are approaching another vessel head-on)

Crossing

(you are travelling across the other vessel’s path)

Overtaking

(you are passing or being passed by another vessel)

In the following illustration, your boat is in the center. You should give the right-of­way to any vessels shown in white area (you are the Give-Way vessel). Any ves­sels in the shaded area must yield to you (they are the Give-Way vessels). Both you and the meeting vessel must alter course to avoid each other.

side. This rule doesn’t apply if both of you will clear one another if you continue on your set course and speed.

102044

Crossing

When two power driven vessels are crossing each other’s path close enough to run the risk of collision, the vessel which has the other on the starboard (right) side must keep out of the way of the other. If the other vessel is on your right, you must keep out of its way; you are the Give-Way vessel. If the other ves­sel is on your port (left) side, remember that you should maintain course and direction, provided the other vessel gives you the right-of-way as it should.

Meeting

If you are meeting another power vessel head on, and are close enough to run the risk of collision, neither of you has the right-of-way! Both of you should alter course to avoid an accident. You should keep the other vessel on your port (left)

102046

Overtaking

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

its course and speed. You must stay out

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of its way until you are clear of it. Like­wise, if another vessel is passing you, you should maintain your speed and direction so that the other vessel can steer itself around you.

OTHER SPECIAL SITUATIONS

There are three other rules you should be aware of when driving your boat around other vessels.

Narrow Channels and Bends

When navigating in narrow channels, you should keep to the right when it is safe and practical to do so. If the operator of a power-driven vessel is preparing to go around a bend that may obstruct the view of other water vessels, the operator should sound a prolonged blast on the whistle (4 to 6 seconds). If another vessel is around the bend, it too should sound the whistle. Even if no reply is heard, however, the vessel should still proceed around the bend with caution. If you navi­gate such waters with your boat, you will need to carry a portable air horn, avail­able from local marine supply stores.

Fishing Vessel Right-of-way

All vessels which are fishing with nets, lines or trawls are considered to be“fish- ing vessels” under the International Rules. Vessels with trolling lines are not considered fishing vessels. Fishing ves­sels have the right-of-way regardless of position. Fishing vessels cannot, howev­er, impede the passage of other vessels in narrow channels.

Sailing Vessel Right-of-way

Sailing vessels should normally be given the right-of-way. The exceptions to this are:

1. When the sailing vessel is overtaking the power-driven vessel, the power­driven vessel has the right-of-way.

2. Sailing vessels should keep clear of any fishing vessel.

3. In a narrow channel, a sailing vessel should not hamper the safe passage of a power-driven vessel which can navigate only in such a channel.

Reading Buoys and Other Markers

The waters of the United states are marked for safe navigation by the lateral system of buoyage. Simply put, buoys and markers have an arrangement of shapes, colors, numbers and lights to show which side of the buoy a boater should pass on when navigating in a par­ticular direction. The markings on these buoys are oriented from the perspective of being entered from seaward (the boater is going towards the port). This means that red buoys are passed on the starboard (right) side when proceeding from open water into port, and black buoys are to port (left) side. When navi­gating out of port, your position with respect to the buoys should be reversed; red buoys should be to port and black buoys to starboard.

Many bodies of water used by boaters are entirely within the boundaries of a partic­ular state. The Uniform State Waterway Marking System has been devised for these waters. This system uses buoys and signs with distinctive shapes and colors to show regulatory or advisory informa­tion. These markers are white with black letters and orange boarders. They signify speed zones, restricted areas, danger areas, and general information.

1-8

Remember, markings may vary by geo-

graphic location. Always consult local boating authorities before driving your boat in unfamiliar waters.

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EMU00016

FUELING INSTRUCTIONS

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GASOLINE AND ITS VAPORS ARE HIGH­LY FLAMMABLE AND EXPLOSIVE! 8 Do not smoke when refueling, and

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

8 Stop engine before refueling. 8 Refuel in a well-ventilated area. Refuel

portable fuel tanks off the boat.

8 Take care not to spill gasoline. If gaso-

line spills, wipe it up immediately with dry rags.

8 Do not overfill the fuel tank. 8 Tighten the filler cap securely after

refueling.

8 If you should swallow some gasoline

inhale a lot of gasoline vapor, or get gasoline in your eyes, get immediate medical attention.

8 If any gasoline spills onto your skin,

immediately wash with soap and water. Change clothing if gasoline spills on it.

8 Touch the fuel nozzle to the filler open-

ing or funnel to help prevent electrosta­tic sparks.

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

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EMU01804

GASOLINE

Recommended gasoline:

Regular unleaded gasoline with a minimum octane rating of 86 (Pump Octane Number) = (R+M)/2

If knocking or pinging occurs, use a differ­ent brand of gasoline or premium unlead­ed fuel.

EMU00027

Gasohol

There are two types of gasohol: gasohol containing ethanol and that containing methanol. Gasohol containing ethanol can be used if ethanol content does not exceed 10% and the fuel meets minimum octane ratings. Gasohol containing methanol is not recommended by Yama­ha because it can cause fuel system dam­age or engine performance problems.

EMU00858

ENGINE OIL

Recommended 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.

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EMU01395

PROPELLER SELECTION

The performance of your outboard motor will be critically affected by your choice of propeller, as an incorrect choice could adversely affect performance and could also seriously damage the motor. Engine speed depends on the propeller size and boat load. If engine speed is too high or too low for good engine performance, this will have an adverse effect on the engine.

Yamaha outboard motors are fitted with propellers chosen to perform well over a range of applications, but there may be uses where a propeller with a different pitch would be more appropriate. For a greater operating load, a smaller-pitch propeller is more suitable as it enables the correct engine speed to be main­tained. Conversely, a larger-pitch pro­peller is more suitable for a smaller oper­ating load.

Yamaha dealers stock a range of pro­pellers, and can advise you and install a propeller on your outboard that is best suited to your application.

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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 “SPECIFICA- TIONS” on page 4-1. Select a propeller which fulfills this requirement. If operating under conditions which allow the engine’s rpm to rise above the maxi­mum recommended range (such as light boat loads), reduce the throttle setting to maintain the rpm in the proper operating range.

1 Propeller diameter (in inches) 2 Propeller pitch (in inches) 3 Type of propeller (propeller mark)

Refer to the section “CHECKING PRO­PELLER” for instructions on propeller removal and installation.

EMU01209

START-IN-GEAR PROTECTION

Yamaha outboard motors or Yamaha approved remote control units are equipped with start-in-gear protection device(s). This feature permits the engine to be started only when it is Neutral. Always select Neutral before starting the engine.

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EMC00010

Chapter 2

BASIC COMPONENTS

MAIN COMPONENTS..............................2-1

OPERATIONS OF CONTROLS AND

OTHER FUNCTIONS ................................2-2

Fuel tank ................................................2-2

Gear shift lever .....................................2-2

Engine stop button...............................2-3

Engine stop lanyard switch .................2-3

Throttle control grip .............................2-4

Choke knob ...........................................2-4

Recoil starter handle ............................2-4

Tiller handle ..........................................2-5

Steering friction adjustment ...............2-6

Trim angle adjusting rod .....................2-6

Tilt lock mechanism .............................2-6

Tilt support bar .....................................2-7

Top cowling lock lever.........................2-7

Carrying handle ....................................2-7

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EMU01206

MAIN COMPONENTS

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1 Top cowling 2 Cowling lock lever 3 Cooling water pilot hole 4 Tilt lock lever 5 Recoil starter handle 6 Gear shift lever 7 Throttle control grip 8 Throttle friction adjustment knob 9 Engine stop button/

Engine stop lanyard switch

0 Clamp screw

2-1

q Carrying handle w Cooling water inlet e Anti-cavitation plate r Trim angle adjusting rod t Clamp bracket y Rope attachment u Choke knob i Fuel tank o Fuel hose

* May not be exactly as shown; also may not

be included as standard equipment on all models.

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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)

Fuel hose joint

This connector is provided for connecting or disconnecting fuel hose.

902051

Fuel meter

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

Fuel tank cap

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

Air Vent screw

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

EMC25010

GEAR SHIFT LEVER (for Tiller control model):

Turning the gear-shift lever towards you engages the clutch with the forward gear so that the boat moves ahead. Turning the lever away from you engages the reverse gear so that the boat moves astern.

1 Neutral 2 Forward 3 Reverse

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EMC27011

ENGINE STOP BUTTON (for Tiller control model)

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

EMU00931

ENGINE STOP LANYARD SWITCH (for Tiller control model)

The lock-plate 1 must be attached to the engine stop lanyard switch for the engine to run. The lanyard 2 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.

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8 Attach the 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.

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EMC40010

THROTTLE CONTROL GRIP (for Tiller control model)

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

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

EMC42310

CHOKE KNOB

Pulling out this knob supplies a rich mix­ture required to start or warm up the engine. There are 4 operating position as shown below :

Position Function

1 To start a hot engine

2 or 3 To warm up a cold engine

or restart a warm engine

4 To start a cold engine

EMC44010

RECOIL STARTER HANDLE (If equipped)

Pull the handle gently until resistance is felt. Then vigorously pull the handle

209011

straight out to crank the engine to start it.

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EMC60010

TILLER HANDLE (for Tiller control model)

Moving the tiller handle sideways to adjust the steering direction.

EMC64010

Throttle Friction Adjustment (for Tiller control model)

A friction device in the tiller handle pro­vides resistance to movement of the throttle grip. This is adjustable for opera­tor preference. An adjusting screw/bolt is located within the tiller handle.

To increase the resistance: Turn the adjusting screw/bolt clockwise. To decrease the resistance: Turn the adjusting screw/bolt counter­clockwise.

When constant speed is desired, tighten the adjusting screw/bolt to maintain the desired throttle setting.

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

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EMD00010

STEERING FRICTION ADJUSTMENT (for Tiller control model)

A friction device provides resistance to steering movement. This is adjustable for operator preference. An adjusting screw/bolt is located on the swivel bracket.

To increase the resistance: Turn the adjusting screw/bolt clockwise.

To decrease the resistance: Turn the adjusting screw/bolt counter­clockwise.

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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.

001742

EMD44110

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

1 Tilt-lock lever

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EMD48010

TILT SUPPORT BAR

The tilt support bar keeps the outboard motor in the tilted up position.

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

EMD68010*

CARRYING HANDLE

The carrying handle is included between the clamp bracket. The carrying handle enables you to carry the outboard motor readily with one hand after setting it up. To set up the carrying handle, proceed as follows.

1) Place the tilt lock lever in the lock position.

2) Securely hook the arm of carrying handle end to the clamp bracket bar.

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Place the tilt lock lever in the lock posi­tion while using the carrying handle. Oth­erwise, the lower casing may fall to the grand while carrying the motor.

1 Clamp bracket bar

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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

Gasoline (petrol) and oil mixing .........3-6

PRE-OPERATION CHECKS ......................3-7

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BREAKING IN (RUNNING IN)

ENGINE .....................................................3-8

STARTING ENGINE ...............................3-10

WARMING UP ENGINE .........................3-13

SHIFTING ................................................3-14

Forward ...............................................3-14

Reverse................................................3-15

STOPPING ENGINE ...............................3-16

TRIMMING OUTBOARD MOTOR.........3-17

Adjusting trim angle ..........................3-18

CRUISING IN SHALLOW WATER.........3-20

TILTING UP/DOWN ...............................3-22

CRUISING IN OTHER CONDITIONS.....3-24

Cruising in salt water .........................3-24

Cruising in turbid water.....................3-24

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EMF10010

INSTALLATION

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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.

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EMU00176

MOUNTING THE OUTBOARD MOTOR

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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 sec-

tion 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)

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