Yamaha YZ125 & YZ250 (1985-1987) &YZ490 (1985-1990) Motorcycle Service Repair Manual ^

Description

Clymer motorcycle repair manuals are written specifically for the do-it-yourself enthusiast. From basic maintenance to troubleshooting to complete overhaul, Clymer manuals provide the information you need. The most important tool in your tool box may be your Clymer manual, get one today.

Every Clymer manual contains hundreds of original photographs and illustrations developed from a complete disassembly and assembly of a motorcycle. This, in addition to extensive research, allows Clymer to achieve an unmatched level of detail, accuracy and clarity.

The step-by-step instructions and two-column text with large print are user-friendly. Bold figure numbers make it easy to quickly match instructions with illustrations and photos. Thumb-tabbed chapters, numbered table of contents and an extensive index make it possible to locate the desired section quickly.

Contents

This Yamaha motorcycle manual is 272 pages.

QUICK REFERENCE DATA

CHAPTER ONE / GENERAL INFORMATION
Manual organization / Service hints / Torque specifications / Safety first / Special tips / Mechanic's tips / Parts replacement / Expendable supplies / Tools / What year is it? / Serial numbers / Specifications

CHAPTER TWO / TROUBLESHOOTING
Operating requirements / Troubleshooting instruments / Emergency troubleshooting / Engine starting / Engine performance / Engine noises / Excessive vibration / Two-stroke pressure test / Clutch / Transmission / Brakes / Water-cooling system (YZ125 and YZ250) / Front suspension and steering / Ignition system / Specifications

CHAPTER THREE / LUBRICATION, MAINTENANCE AND TUNE-UP
Pre-checks / Tires and wheels / Lubricants / Cleaning solvent / Periodic lubrication / Engine lubrication / Clutch/Transmission oil checking and changing / Front fork oil change / Front fork air pressure / Periodic maintenance / Drive chain adjustment / Clutch adjustment / Fuel filter and shutoff valve / Coolant change / Air cleaner service / Engine tune-up / Cylinder head nuts torque / Spark plug / Ignition timing / Carburetor pilot screw and idle speed adjustment / Decarbonizing engine and exhaust system / Storage / Specifications

CHAPTER FOUR / ENGINE
Engine principles / Servicing engine in frame / Engine removal installation / Cylinder head / Cylinder / Piston, wrist pin and piston rings / Break-in procedure / Magneto / Reed valve assembly / Crankcase and crankshaft / Kickstarter / Service and adjustment / Specifications

CHAPTER FIVE / CLUTCH AND TRANSMISSION
Clutch / Clutch cable / External shift mechanism / Primary drive gear / Drive sprocket / Transmission / Specifications

CHAPTER SIX / FUEL, POWER VALVE AND EXHAUST SYSTEMS
Air cleaner / Carburetor operation / Carburetor service / Carburetor adjustments / Fuel shutoff valve / Fuel tank / Energy induction system (YZ490) / Power valve induction system / Exhaust system / Exhaust system decarbonizing / Exhaust system repair / Specifications

CHAPTER SEVEN / IGNITION SYSTEM
Capacitor discharge ignition / Magneto (outer rotor) / Magneto (inner rotor) / Magneto coil testing (all models) / Capacitor discharge ignition unit / Ignition coil / Spark plug / Engine kill switch / Wiring diagrams / Specifications

CHAPTER EIGHT / COOLING SYTEM
Cooling system inspection / Radiator / Water pump / Specifications

CHAPTER NINE / FRONT SUSPENSION AND STEERING
Front wheel / Front hub / Wheels / Tire changing / Tire repairs / Handlebar / Steering head / Front fork / Specification...