YZ125 85-87, YZ250 85-87, YZ490 85-90

Description

Nummer M390, Engelse taal.
Uitvoerige beschrijvingen voor onderhoud of reparaties. Omvat de volgende modellen:
 YZ125 (1985-1987),  YZ250 (1985-1987),  YZ490 (1985-1990)
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 / SpecificationsCHAPTER 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 / SpecificationsCHAPTER FIVE / CLUTCH AND TRANSMISSION Clutch / Clutch cable / External shift mechanism / Primary drive gear / Drive sprocket / Transmission / SpecificationsCHAPTER 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 / SpecificationsCHAPTER 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 / SpecificationsCHAPTER EIGHT / COOLING SYTEM Cooling system inspection / Radiator / Water pump / SpecificationsCHAPTER NINE / FRONT SUSPENSION AND STEERING Front wheel / Front hub / Wheels / Tire changing / Tire repairs / Handlebar / Steering head / Front fork / SpecificationsCHAPTER 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) / SpecificationsCHAPTER 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 / SpecificationsCHAPTER TWELVE / SUSPENSION ADJUSTMENT Yamaha factory accessories / Front fork / Rear shock absorber / SpecificationsINDEX WIRING DIAGRAMS