• MOTORCYCLE SERVICE MANUAL

MOTORCYCLE SERVICE MANUAL

MOTORCYCLE SERVICE MANUAL

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MODELS COVERED:

YZ125 (1988-1993)
YZ250 (1988-1993)
YZ250WR (1989-1990)
WR250Z (1991-1993)

This Yamaha motorcycle manual is 488 pages.

QUICK REFERENCE DATA

CHAPTER ONE / GENERAL INFORMATION
Manual organization / Notes, cautions and warnings / Safety first / Service hints / Washing the bike / Torque specifications / Fasteners / Lubricants / RTV gasket sealant / Threadlock / Parts replacement / Optional parts / Basic hand tools / Precision measuring tools / Special tools / Fabricating tools / Mechanic's tips / Ball bearing replacement / Oil seals / Safety / Specifications

CHAPTER TWO / TROUBLESHOOTING
Operating requirements/ Troubleshooting instruments / Starting the engine / Starting difficulties / Engine starting troubles / Engine performance / Engine / Engine noises / Two-stroke pressure testing / Fuel system / Ignition system / Clutch / Transmission / Drive train noise / Front suspension and steering / Rear suspension / Frame noise / Brakes / Specifications

CHAPTER THREE / LUBRICATION, MAINTENANCE AND TUNE-UP
Pre-ride checklist / Maintenance schedule / Tires and wheels / Lubricants / Cleaning solvent / Engine lubrication / Periodic lubrication / Transmission oil level check and change / Front fork oil change and oil level adjustment / Drive chain lubrication / Swing arm bearing assembly lubrication / Relay arm and connecting rod lubrication / Kickstarter spline lubrication / Front fork dust and oil seal cleaning and lubrication (1989-on) / Periodic maintenance / Drive chain cleaning and adjustment / Clutch adjustment / Throttle cable adjustment / Air filter service / Fuel valve cleaning / Sprocket bolt tightness / Coolant change / Engine tune-up / Cylinder head nuts torque / Spark plug / Ignition timing (CDI) / Carburetor idle speed adjustment / Idle speed and mixture adjustment / Carbon removal / Storage / Specifications

CHAPTER FOUR / ENGINE TOP END
Engine principles / Engine lubrication / Cleanliness / Servicing engine in frame / Cylinder head / Cylinder and power valve / Piston, wrist pin and piston rings / Reed valve assembly / Engine break-in / Specifications

CHAPTER FIVE / ENGINE LOWER END
Servicing engine in frame / Engine / Engine sprocket / Countershaft oil seal replacement / Crankcase and crankshaft / Specifications

CHAPTER SIX / CLUTCH / KICKSTARTER AND EXTERNAL SHIFT MECHANISM
Right-hand crankcase cover / Clutch cover / Clutch release mechanism / Clutch release arm / Exhaust governor assembly / Clutch / Clutch service / Clutch inspection / Primary drive pinion gear / Clutch cable / Kickstarter and idler gear / External shift mechanism / Specifications

CHAPTER SEVEN / TRANSMISSION AND INTERNAL SHIFT MECHANISM
Transmission operation / Transmission troubleshooting / Transmission / Transmission overhaul / Transmission inspection / Internal shift mechanism / Specifications

CHAPTER EIGHT / FUEL AND EXHAUST SYSTEMS
Air filter / Carburetor operation / Carburetor service / Carburetor cleaning and inspection / Carburetor float height adjustment / Carburetor rejetting / Fuel tank / Fuel shutoff valve / Exhaust system / Exhaust system repair / Specifications

CHAPTER NINE / IGNITION SYSTEM
Component testing / Capacitor discharge ignition / Flywheel rotor / CDI unit / Ignition coil / Spark plug / Engine stop switch / Wiring diagrams / Specifications

CHAPTER TEN / LIQUID COOLING SYSTEM
Safety precautions / Cooling system inspection / Radiator / Water pump / Hoses / Specifications

CHAPTER ELEVEN / FRONT SUSPENSION AND STEERING
Front wheel / Front hub / Rim and spoke service / Tire changing / Tire repairs / Handlebar / Steering head / Front fork / Specifications

CHAPTER TWELVE / REAR SUSPENSION
Rear wheel / Rear hub / Driven sprocket / Drive chain / Tire changing and tire repairs / Shock absorber / Rear swing arm and linkage / Swing arm side clearance / Bearing / Sub-frame and back stay / Specifications

CHAPTER THIRTEEN / BRAKES
Disc brake / Front brake pad / Front caliper / Front master cylinder / Rear brake pad / Rear brake caliper / Rear master cylinder / Brake hose / Brake disc / Brake bleeding / Specifications

INDEX

WIRING DIAGRAMS

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MOTORCYCLE SERVICE MANUAL

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Product Specifications

General Information

Brandclymer
LabelYAM YZ125-250; WR250Z 88-93
Universemoto
Categorymanuel_d_entretien
Supplier Part #CM391
ITL ID252-M391

Dimensions & Physical

Weight 1.896 lbs
Length10.25
Width7
Thickness1

Vehicle Fitment

Total Applications17
Applications YAMAHA WR250 1991YAMAHA WR250 1992YAMAHA WR250 1993YAMAHA YZ125 1988YAMAHA YZ125 1989YAMAHA YZ125 1990YAMAHA YZ125 1991YAMAHA YZ125 1992YAMAHA YZ125 1993YAMAHA YZ250 1988YAMAHA YZ250 1989YAMAHA YZ250 1990YAMAHA YZ250 1991YAMAHA YZ250 1992YAMAHA YZ250 1993YAMAHA YZ250WR 1989YAMAHA YZ250WR 1990
Makes YAMAHA
Models WR250YZ125YZ250YZ250WR
Years 198819891990199119921993

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