2008-2012 Yamaha WR250FX Owner's Service Manual (P/N LIT-11626-21-56)

• Official 100-page Yamaha OEM workshop publication (P/N LIT-11626-21-56, first edition July 2007)
• Covers the 2008–2012 Yamaha WR250FX (5UM-series build), detailing general information, regular inspection, tuning, engine, chassis, carburetor, and electrical systems
• Features 47 torque-specification tables, 8 detailed cable-routing diagrams, and 12 lubrication-system diagrams
• Documents essential factory maintenance intervals specifically tailored for competition usage

Detailed Content Breakdown

Whether you are prepping for a weekend enduro or tearing down a liquid-cooled DOHC engine, this Yamaha OEM publication delivers the exact factory data required. It breaks down the 5UM-series build into logical, easy-to-navigate chapters. You get general identification, performance metrics, and specialized tuning parameters for both the engine and chassis. The documentation thoroughly maps out cooling systems, electrical circuits, and drivetrain components. It essentially takes the guesswork out of adhering to factory standards. Note that proper shop protocols and safety gear must always be utilized when working on high-performance dirt bikes, and critical systems should be verified by certified professionals to ensure reliable operation.

Critical Specifications

Workshop accuracy relies on exact tolerances. This reference provides exhaustive tables covering strict engine clearances and vital fluid requirements. For instance, piston-to-cylinder clearance rests tightly between 0.030 and 0.055 mm. Periodic engine oil changes require exactly 1.1 liters. Need to check the clutch? Friction plate thickness sits at 1.1–1.3 mm. Intake valve clearances are set at 0.10–0.15 mm, with exhaust valves demanding 0.17–0.22 mm. The guide also outlines precise fastening values to prevent overtightening, such as 33 Nm for the kickstarter engagement torque, 16 Nm for the silencer clamp, and 10 Nm for the air filter case cover.