Yamaha YFM660FS Manual

LIT-11616-17-14 5KM-28197-E2

YFM660FS

SUPPLEMENTARY

SERVICE MANUAL

FOREWORD

This Supplementary Service Manual has been prepared to introduce new service and data for the

YFM660FS. For complete service information procedures it is necessary to use this Supplementary

Service Manual together with the following manual.

YFM660FP SERVICE MANUAL: LIT-11616-15-01 (5KM-28197-E0)

YFM660FR SUPPLEMENTARY SERVICE MANUAL: LIT-11616-16-34 (5KM-28197-E1)

YFM660FS

SUPPLEMENTARY

SERVICE MANUAL

First Edition, April 2003

Any reproduction or unauthorized use

without the written permission of

Yamaha Motor Corporation, U.S.A.

is expressly prohibited.

Printed in U.S.A.

LIT-11616-17-14

EB001000

NOTICE

This manual was produced by the Yamaha Motor Company primarily for use by Yamaha dealers

and their qualified mechanics. It is not possible to include all the knowledge of a mechanic in one

manual, so it is assumed that anyone who uses this book to perform maintenance and repairs on

Yamaha machine has a basic understanding of the mechanical ideas and the procedures of

machine repair. Repairs attempted by anyone without this knowledge are likely to render the

machine unsafe and unfit for use.

Yamaha Motor Company, Ltd. is continually striving to improve all its models. Modifications and sig-

nificant changes in specifications or procedures will be forwarded to all authorized Yamaha dealers

and will appear in future editions of this manual where applicable.

OTE:

Designs and specifications are subject to change without notice.

IMPORTANT INFORMATION

Particularly important information is distinguished in this manual by the following notations.

The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR

SAFETY IS INVOLVED!

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

machine.

A CAUTION indicates special precautions that must be taken to avoid dam-

age to the machine.

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

WARNING

CAUTION:

NOTE:

EB002000

HOW TO USE THIS MANUAL

MANUAL ORGANIZATION

This manual consists of chapters for the main categories of subjects. (See “Illustrated symbols”)

1st title 1: This is the title of the chapter with its symbol in the upper right corner of each page.

2nd title 2: This title indicates the section of the chapter and only appears on the first page of each

section. It is located in the upper left corner of the page.

3rd title 3: This title indicates a sub-section that is followed by step-by-step procedures accompa-

nied by corresponding illustrations.

EXPLODED DIAGRAMS

To help identify parts and clarify procedure steps, there are exploded diagrams at the start of each

removal and disassembly section.

1. An easy-to-see exploded diagram 4is provided for removal and disassembly jobs.

2. Numbers 5are given in the order of the jobs in the exploded diagram. A number that is enclosed

by a circle indicates a disassembly step.

3. An explanation of jobs and notes is presented in an easy-to-read way by the use of symbol marks

6. The meanings of the symbol marks are given on the next page.

4. A job instruction chart 7accompanies the exploded diagram, providing the order of jobs, names

of parts, notes in jobs, etc.

5. For jobs requiring more information, the step-by-step format supplements 8are given in addition

to the exploded diagram and the job instruction chart.

EB003000

ILLUSTRATED SYMBOLS

Illustrated symbols 1to 0are printed on the

top right of each page and indicate the subject

of each chapter.

1General information

2Specifications

3Periodic checks and adjustments

4Engine

5Cooling system

6Carburetion

7Drive train

8Chassis

9Electrical

0Troubleshooting

Illustrated symbols Ato Hare used to identify

the specifications appearing in the text.

ACan be serviced with engine mounted

BFilling fluid

CLubricant

DSpecial tool

ETorque

FWear limit, clearance

GEngine speed

HΩ, V, A

Illustrated symbols Ito Nin the exploded

diagrams indicate the types of lubricants and

lubrication points.

IApply engine oil

JApply gear oil

KApply molybdenum disulfide oil

LApply wheel bearing grease

MApply lightweight lithium-soap-based grease

NApply molybdenum disulfide grease

Illustrated symbols Oto Pin the exploded

diagrams indicate where to apply a locking

agent Oand when to install a new part P.

OApply the locking agent (LOCTITE)

PReplace

IJK

LMN

GEN

INFO SPEC

CHK

ADJ ENG

COOL CARB

DRIV

CHAS

–+

ELEC TRBL

SHTG

EGM

BLS M

New

CONTENTS

GENERAL INFORMATION ..............................................................................1

FEATURES ...............................................................................................1

OVERRIDE SWITCH (DEACTIVATING THE SPEED LIMITER

WHEN THE DIFFERENTIAL IS LOCKED) ...........................................1

SPECIFICATIONS ............................................................................................3

GENERAL SPECIFICATIONS ..................................................................3

MAINTENANCE SPECIFICATIONS .........................................................4

ENGINE ................................................................................................4

CHASSIS ..............................................................................................5

ELECTRICAL ........................................................................................5

CHASSIS ..........................................................................................................6

STEERING SYSTEM ................................................................................6

INSTALLING THE REAR BRAKE LEVER ............................................6

ELECTRICAL ...................................................................................................7

CHECKING THE SWITCH ........................................................................7

CHECKING THE SWITCH CONTINUITY .............................................7

SIGNAL SYSTEM .....................................................................................9

CIRCUIT DIAGRAM ..............................................................................9

YFM660FS WIRING DIAGRAM

GEN

INFO

–1 –

GENERAL INFORMATION

FEATURES

OVERRIDE SWITCH

(DEACTIVATING THE SPEED LIMITER WHEN THE DIFFERENTIAL IS LOCKED)

This model is equipped with a speed limiter system (35 km/h [22 mph]) that operates when the dif-

ferential is locked and the ATV is traveling forward. If additional engine power is required (e.g., to

free the ATV from mud) when the ATV is traveling forward and the differential is locked, the speed

limiter can be temporarily deactivated by pressing the override switch.

OTE:

The speed limiter is deactivated only while the override switch is being pressed.

1Override switch

When the override switch is pressed, the segments of the speedometer digits are displayed as fol-

lows.

OTE:

●When the front differential gear is locked and the drive select lever is in the “L”, “H”, “N”, or “P”

position, the display changes when the override switch is pressed. (The speedometer display is

not displayed at this time.)

●When the front differential gear is not locked or the drive select lever is in the “R”position, the dis-

play does not change even if the override switch is pressed.

mph

ODOTRIP AB

CLOCKHOUR

OFF

LOCK

0.2s 0.2s

FEATURES

GEN

INFO

–2 –

FEATURES

CAUTION:

If the segments of the speedometer digits show the override display when the override

switch is not pressed, the speed limiter system is malfunctioning. Check the override switch

and ignition system, and then repair if necessary.

–3 –

SPEC

SPECIFICATIONS

GENERAL SPECIFICATIONS

Item Standard

Model code: 5KMH

5KMM

5KMN

5KMP

Transmission:

Primary reduction system V-belt

Secondary reduction system Shaft drive

Secondary reduction ratio 41/21 ×24/18 ×33/9 (9.544)

Transmission type V-belt automatic

Operation Left hand operation

Single speed automatic 2.45 ~ 0.70 : 1

Sub transmission ratio low 35/17 (2.058)

high 26/21 (1.238)

Reverse gear 25/17 (1.471)

GENERAL SPECIFICATIONS

–4 –

SPEC

MAINTENANCE SPECIFICATIONS

ENGINE

Item Standard Limit

Carburetor:

I. D. mark 5KMA 10 ----

Main jet (M.J) #153.8 ----

Main air jet (M.A.J) #70 ----

Jet needle (J.N) 6JPH9-53-2 ----

Needle jet (N.J) O-0M ----

Pilot air jet (P.A.J.1) #60 ----

Pilot air jet (P.A.J.2) 1.5 ----

Pilot outlet (P.O) 1.1 ----

Pilot jet (P.J) #40 ----

Bypass 1 (B.P.1) 0.8 ----

Bypass 2 (B.P.2) 0.8 ----

Bypass 3 (B.P.3) 0.8 ----

Valve seat size (V.S) 3.0 ----

Starter jet (G.S.1) #55 ----

Starter jet (G.S.2) 0.8 ----

Throttle valve size (Th.V) #105 ----

Float height (F.H) 13 mm (0.51 in) ----

Fuel level (F.L) 4.5 mm (0.18 in) ----

Engine idle speed 1,450 ~ 1,550 r/min ----

Intake vacuum 30.7 ~ 33.3 kPa

(230 ~ 250 mmHg, 9.07 ~ 9.83 inHg)

----

MAINTENANCE SPECIFICATIONS

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