Yamaha YZ125, YZ250 & YZ490 1985-1990 Service & Repair Manual (Clymer M390)

Yamaha YZ125, YZ250 & YZ490 1985-1990 Service & Repair Manual (Clymer M390)
Brand:Clymer
Product Code:Clymer M390
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Clymer Yamaha YZ125-250, 1985-1987 and YZ490 1985-1990
Copyright:
UPC Code:024185760931
ISBN: 9780892876099
 
Item ID:M390

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 / Specifications

CHAPTER TEN / REAR SUSPENSION
Rear wheel / Rear hub / Driven sprocket / Drive chain / Tire changing and tire repairs / Spoke and rim replacement / Rear swing arm / Rear suspension (Decarbon Monocross System) / Specifications

CHAPTER ELEVEN / BRAKES
Front disc brake / Front brake pad / Front caliper / Front master cylinder / Front brake hose / Front brake disc / Bleeding the system / Rear brake / Rear brake pedal assembly / Specifications

CHAPTER TWELVE / SUSPENSION ADJUSTMENT
Yamaha factory accessories / Front fork / Rear shock absorber / Specifications

INDEX

WIRING DIAGRAMS


Models covered:
1985 1986 1987 Yamaha YZ125 
1985 1986 1987 Yamaha YZ250 
1985 1986 1987 1988 1989 1990 Yamaha YZ490 

 

 

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