1989-1991 Yamaha YZ125W / YZ250W / YZ250WRW / YZ250B Service Manual

Inside the 1989–1991 Yamaha YZ250W Service Manual

• Covers 1989–1991 Yamaha YZ250W motocross bikes, detailing disassembly and reassembly of the engine and chassis components.
• Official Yamaha publication P/N LIT-11626-06-76, first edition July 1988.
• Contains 26 exploded-view diagrams, 8 cable routing illustrations, and exhaustive torque specifications for standard and engine-specific fasteners.
• 175 pages of technical documentation providing precise internal clearances, wear limits, and engine assembly data.
• File link appears in your order confirmation straight away.
• Page spreads stay legible when printed at original size.
• This 1st Edition, July 1988 release serves as the primary technical build for the YZ250W series chassis and engine components.

Technical Scope and Disassembly

This Yamaha YZ250W service manual provides a structured breakdown for the maintenance of high-performance racing machinery. The publication focuses exclusively on mechanical disassembly and reassembly, documenting the internal architecture of the 246 cm³ liquid-cooled engine, primary drive gear, clutch assemblies, and the YPVS governor. Detailed chapters cover the cooling system with radiator and water pump maintenance, transmission configurations, and CDI magneto setup to support mechanical accuracy during overhauls.

Specification Data and Mechanical Limits

Engine and Torque Reference Values

The manual documents engine assembly specifications including cylinder head warpage limits of