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Softcover – 256 pages – Yamaha YZ125 YZ250 YZ490 1985 – 1990 Clymer Owners Service Repair Manual Covers the following models: Yamaha YZ125 1985-1987 Yamaha YZ250 1985-1987 Yamaha YZ490 1985-1990Contents: QUICK REFERENCE DATA GENERAL INFORMATIONManual organization / Service hints / Torque specifications / Safety first / Special tips / Mechanic #39;s tips / Parts replacement / Expendable supplies / Tools / What year is it? / Serial numbers / Specifications TROUBLESHOOTINGOperating 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 LUBRICATION MAINTENANCE AND TUNE-UPPre-checks / Tyres 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 ENGINEEngine 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 CLUTCH AND TRANSMISSIONClutch / Clutch cable / External shift mechanism / Primary drive gear / Drive sprocket / Transmission / Specifications FUEL POWER VALVE AND EXHAUST SYSTEMSAir 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 IGNITION SYSTEMCapacitor 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 COOLING SYTEMCooling system inspection / Radia more data

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Yamaha YZ125, YZ250 and YZ490 1985 – 1990 Clymer Owners … Softcover – 256 pages – Yamaha YZ125 YZ250 YZ490 1985 – 1990 Clymer Owners Service Repair Manual Covers the following models: Yamaha YZ125 1985-1987 Yamaha …

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