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YFM660FS
5KM2-AE3
SUPPLEMENTARY
SERVICE MANUAL

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Summary of Contents for Yamaha YFM660FWA

  • Page 1 YFM660FS 5KM2-AE3 SUPPLEMENTARY SERVICE MANUAL...
  • Page 3 YFM660F(P) 2002 SERVICE MANUAL: 5KM2-AE1 YFM660FR SUPPLEMENTARY SERVICE MANUAL: 5KM2-AE2 YFM660FS SUPPLEMENTARY SERVICE MANUAL ©2003 by Yamaha Motor Co., Ltd. First edition, April 2003 All rights reserved. Any reproduction or unauthorized use without the written permission of Yamaha Motor Co., Ltd.
  • Page 4: Important Information

    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.
  • Page 5 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.
  • Page 6 EB003000 ILLUSTRATED SYMBOLS Illustrated symbols 1 to 0 are printed on the SPEC INFO top right of each page and indicate the subject of each chapter. 1 General information 2 Specifications 3 Periodic checks and adjustments 4 Engine 5 Cooling system 6 Carburetion 7 Drive train COOL...
  • Page 7: Table Of Contents

    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...
  • Page 9: General Information

    FEATURES INFO 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.
  • Page 10 FEATURES INFO 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. – 2 –...
  • Page 11: Specifications

    SPEC GENERAL SPECIFICATIONS SPECIFICATIONS GENERAL SPECIFICATIONS Item Standard Model code: 5KMJ/5KMR (for CDN) 5KMK/5KMS (for Europe) 5KML (for Oceania) Transmission: Primary reduction system V-belt Secondary reduction system Shaft drive 41/21 × 24/18 × 33/9 (9.544) Secondary reduction ratio Transmission type V-belt automatic Operation Left hand operation...
  • Page 12: Maintenance Specifications

    SPEC MAINTENANCE SPECIFICATIONS MAINTENANCE SPECIFICATIONS ENGINE Item Standard Limit Carburetor: I. D. mark 5KMA 10 ---- Main jet (M.J) #153.8 ---- Main air jet (M.A.J) ---- Jet needle (J.N) 6JPH9-53-2 ---- Needle jet (N.J) O-0M ---- Pilot air jet (P .A.J.1) ---- Pilot air jet (P .A.J.2)
  • Page 13: Chassis

    SPEC MAINTENANCE SPECIFICATIONS CHASSIS Item Standard Limit Front suspension: Shock absorber travel 86 mm (3.39 in) ---- Fork spring free length 296.5 mm (11.67 in) (for CDN) 290.6 mm (11.44 in) 307.0 mm (12.09 in) (for Europe 300.9 mm and Oceania) (11.85 in) Spring fitting length 237 mm (9.33 in)
  • Page 14: Chassis

    CHAS STEERING SYSTEM CHASSIS STEERING SYSTEM INSTALLING THE REAR BRAKE LEVER 1.Install: Handlebar switch 1 Rear brake lever Lever bracket 2 NOTE: Install the lever bracket as shown. a 74.5 mm (2.9 in) – 6 –...
  • Page 15: Electrical

    – ELEC CHECKING THE SWITCH ELECTRICAL CHECKING THE SWITCH CHECKING THE SWITCH CONTINUITY Refer to “CHECKING THE SWITCH” in CHAPTER 9 (Manual No.: 5KM2-AE1) and check for conti- nuity between lead terminals. Poor connection, no continuity → Correct or replace. The coupler locations are circled.
  • Page 16 – ELEC CHECKING THE SWITCH 1 Light switch 2 Engine stop switch 3 Start switch 4 Override switch 5 On-command four-wheel drive switch and differential gear lock switch 6 Main switch 7 Rear brake light switch 8 Front brake light switch 9 Rear brake switch 0 Horn switch (for Europe and Oceania) A Gear position switch...
  • Page 17: Signal System

    – ELEC SIGNAL SYSTEM EB806000 SIGNAL SYSTEM CIRCUIT DIAGRAM – 9 –...
  • Page 18 – ELEC SIGNAL SYSTEM 3 Main switch 4 Backup fuse 5 Battery 6 Main fuse 9 Reverse switch 0 CDI unit D Speed sensor F Multi-function meter G Differential gear lock indicator light H Coolant temperature indicator light I Reverse indicator light J Neutral indicator light K Park indicator light L High-range indicator light...
  • Page 20 YAMAHA MOTOR CO., LTD. 2500 SHINGAI IWATA SHIZUOKA JAPAN...
  • Page 21: Yfm660Fs Wiring Diagram

    YFM660FS WIRING DIAGRAM 1 AC magneto 2 Rectifier/regulator 3 Main switch R/B Br/B Br/B (GRAY) (GRAY) R/B L/W G/W W/B 4 Backup fuse B/R Lg B/Y R WIRE HARNESS SUB-WIRE HARNESS WIRE HARNESS SUB-WIRE HARNESS WIRE HARNESS IGNITION COIL LEAD 5 Battery (BLACK) (BLACK)

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