1992-2000 Yamaha Timberwolf 250 / YFB250 Service & Repair Manual
Yamaha Models Covered & Key Technical Specifications
Models: Yamaha YFB250 Timberwolf 250 (YFB250(D) '92)
Sub-models / Variants: USA, CDN (Canada), CH (Switzerland), GB (Great Britain), AUS (Australia), NZ (New Zealand), ZA (South Africa), OCE (Oceania)
Trade Names: Timberwolf
Model Years: 1992–2000
Serial Numbers: USA: JY44BDA0NA000101, 4BD-000101; CDN: JY44BDN0NA031101, 4BD-031101; AUS: JY44BDT0*NA050101, 4BD-050101
Technical Data:
- Engine: Air-cooled 4-stroke gasoline, SOHC, single cylinder
- Displacement: 229.6 cc
- Transmission: Constant Mesh 5-Speed with automatic centrifugal clutch
- Drive System: Shaft drive
- Starting System: Electric and Recoil starter (except USA)
- Compression Pressure: 900 kPa (128 psi) standard
- Ignition System: C.D.I. with 12V flywheel magneto
- Tire Size: Front AT22x7-10, Rear AT22x10-10
- Engine Oil Capacity: 1.5 L (1.6 US qt) for periodic change
Yamaha Manual Features & Content Preview
- Covers 1992–2000 Yamaha YFB250 Timberwolf 250 models, including international variants like USA, Canada, Australia, and New Zealand configurations
- Official Yamaha publication P/N LIT-11616-YB-27, first edition dated September 1991
- Features 11 dedicated chapters detailing engine overhauls, chassis maintenance, drivetrain specs, and electrical schematics
- Serves as the primary factory reference for the 4BD-series chassis, documenting original specifications, repair data, and drivetrain components
Factory Documentation Overview
The technical documentation for the Yamaha YFB250 Timberwolf 250 provides a thorough breakdown of all machine systems. This manual outlines the exact periodic maintenance intervals required to keep the SOHC engine performing reliably. Inside, you will find detailed parameters for chassis inspections, steering system geometry, and brake drum maintenance alongside comprehensive electrical component testing. For drivetrain work, the transmission and final drive sections offer specialized guidance on gear lash adjustment and shim selection. Every mechanical assembly is documented with precise exploded views and torque requirements. To ensure workshop safety, always verify the ATV is properly supported and battery power is disconnected before inspecting high-tension electrical or mechanical systems.
Specification and Reference Highlights
Understanding the exact tolerances is crucial for any rebuild. The specification section details critical engine wear limits and fluid capacities for the 229.6 cc powerplant. Intake valve clearance is mapped directly at 0.05–0.09 mm. When performing a standard fluid change, the engine oil capacity requires exactly 1.5 liters, while the final drive oil capacity takes 0.13 liters for a complete system fill. Furthermore, ignition timing is fixed at 10° at 1,000 r/min, advancing to 30° at 6,000 r/min. This reference material ensures you have the exact factory data needed when planning your next repair or maintenance schedule.
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