Yamaha YZ125W, YZ250W, YZ250WRW, YZ250B 1989–1991 OEM Service Manual

• Covers 1989–1991 Yamaha YZ250W motocross bikes, detailing complete disassembly and reassembly of engine and chassis components.
• Official Yamaha OEM publication (P/N LIT-11626-06-76, LIT-11626-06-91), first edition release from July 1988.
• Features 26 exploded-view diagrams, 8 specific cable routing illustrations, and exhaustive standard and engine-specific torque specs.
• 175 pages of exact technical data. Find precise internal clearances, wear limits, and factory assembly instructions.

Technical Scope and Disassembly

Getting a vintage 2-stroke back on the track requires exact factory data. This official Yamaha publication delivers a focused breakdown of the mechanical internals for the 246 cm³ liquid-cooled engine. It skips the basic filler and dives straight into the heavy lifting: primary drive gear alignment, clutch rebuilds, and tuning the YPVS governor. You get clear guidance on overhauling the cooling system, rebuilding the water pump, and setting up the CDI magneto to ensure mechanical precision.

Because you get this manual as an instant download, you can pull up the schematics on your shop tablet right away and get to work. Please note that servicing high-performance racing machinery involves inherent risks. Always maintain a clean workspace, relieve pressure from cooling and suspension systems before teardown, and strictly observe standard workshop safety protocols.

Engine and Torque Reference Values

Don't guess on the top end. The manual lists hard limits, dictating **cylinder head warpage (