MANUEL D'ENTRETIEN POUR VTT

MODELS COVERED:

YFM250 Timberwolf (1989-1991)
YFB250 Timberwolf (1992-1998)
YFB250FW Timberwolf (1994-2000)

This Yamaha Timberwolf ATV Manual is 536 pages.

QUICK REFERENCE DATA

CHAPTER ONE / GENERAL INFORMATION
Manual organization / Notes, warnings and cautions / Safety first / Service hints / Washing the vehicle / Torque specifications / Lubricants / Sealant, cements and cleaners / Threadlocking compound / Expendable supplies / Serial numbers / Warning labels / Basic hand tools / Precision measuring tools / Special tools / Fabricating tools / Mechanic's tips / Ball bearing replacement / Seals / Riding safely / Storage / Specifications

CHAPTER TWO / TROUBLESHOOTING
Operating requirements / Troubleshooting instruments / Starting the engine / Starting difficulties / Poor idle speed / Poor medium and high speed performance / Starting system / Charging system / Ignition system / Lighting system / Cooling system testing / Fuel system / Engine overheating / Engine / Engine overheating / Engine noises / Engine leak down test / Clutch / Transmission / Drive train Noise / Handling / Frame noise / Brakes

CHAPTER THREE / LUBRICATION, MAINTENANCE AND TUNE-UP
Pre-ride check list / Maintenance service schedule intervals / Periodic lubrication / Engine oil and filter change / Oil flow inspection / Front differential gearcase oil change / Rear differential drive gearcase oil change / Control cable lubrication / Unscheduled lubrication / Periodic maintenance / Unscheduled maintenance / Tune-up / Valve clearance / Cylinder compression / Spark plug / Air filter / Ignition timing / Pilot air screw adjustment / Idle speed adjustment / Specifications

CHAPTER FOUR / ENGINE TOP END
Engine principles / Cylinder head / Camshaft and rocker arms / Camshaft chain / Chain guides / Valves and valve components / Cylinder block / Piston and piston rings / Specifications

CHAPTER FIVE / ENGINE LOWER END
Servicing engine in frame / Subtransmission and reverse gear assembly / Middle driven and reverse gear assembly / Transfer gear assembly / Middle drive gear / Transmission drive select lever / Oil pump / Balancer driven gear / Magneto stator and stator housing / Magneto rotor and starter clutch / Right-hand crankcase spacer / Crankcase and crankshaft / Recoil starter / Break-in procedure / Specifications

CHAPTER SIX / CLUTCH AND EXTERNAL SHIFT MECHANISM
Clutch cover / Clutch release lever mechanism / Clutch assemblies / One-way clutch inspection / External shift mechanism / Specifications

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

CHAPTER EIGHT / FUEL AND EXHAUST SYSTEMS
Carburetor adjustments / Throttle cable replacement / Choke cable replacement / Throttle lever housing / Fuel tank / Fuel shutoff valve / Air filter air box / Exhaust system / Specifications

CHAPTER NINE / ELECTRICAL SYSTEM
Basic information / Charging system / Voltage regulator/rectifier / Capacitor discharge ignition / Ignition coil / CDI magneto (stator source and pickup coils) / Starting system / Starter relay / Lighting system / Indicator light system / Instrument panel / Handlebar cover and indicator lights / Switch / Relays / Fuses / Specifications

CHAPTER TEN / FRONT SUSPENSION AND STEERING
Front wheel / Front hub brake drum / Front suspension / Shock absorber / Steering knuckle / Control arm / Control arm bushing / Ball joint / Handlebar / Tie rods / Steering shaft / Tires and wheels / Specifications

CHAPTER ELEVEN / FRONT DRIVE MECHANISM FOUR-WHEEL DRIVE
Front drive axle / Front differential gearcase / Front drive shaft / Specifications

CHAPTER TWELVE / REAR SUSPENSION AND FINAL DRIVE
Rear wheels / Rear hub / Rear hub brake drum / Rear axle / Final drive unit and short drive shaft / Tire changing and tire repairs / Shock absorber / Swing arm / Specifications

CHAPTER THIRTEEN / BRAKES
Front brake drum / Rear brake disc / Rear drum brake hub / Rear brake pedal / Specifications

CHAPTER FOURTEEN / BODY
Seat / Front guard / Front bumper / Front carrier/rack / Rear carrier/rack / Rear bumper / Rear handle / Fuel tank cover assembly / Front fender / Front fender / Rear fender / Footrests / Specifications

INDEX

WIRING DIAGRAMS