2009 Yamaha YZ250Y Owner's Service Manual (P/N LIT-11626-22-55)

• Covers the 2009 Yamaha YZ250Y 2-stroke motocross platform, including USA, CDN, AUS, NZ, and European market releases
• Official Yamaha publication P/N LIT-11626-22-55 (1st Edition, April 2008)
• 244-page complete OEM technical reference, featuring 47 pages dedicated exclusively to torque tables, cable routing, and exploded-view parts diagrams
• Documents frame-specific torque values and base carburetor settings exclusive to the 1P8-series launch build

Engine and Chassis Documentation

Inside, you will find the required data for a complete teardown and inspection of the liquid-cooled 250cc powerplant. The literature outlines factory tolerances for the piston, cylinder, clutch pack, and 5-speed transmission. It highlights wear limits for critical components like the reed valve assembly and water pump, alongside base fuel-oil premix ratios. Servicing high-performance race equipment involves inherent risks to rider safety. Always verify component clearances and fastener integrity against these factory baselines, or involve a certified mechanic if you lack the required diagnostic tooling.

Specification Highlights and Torque Data

The chassis section maps out suspension tuning, detailing the exact valving and damping adjustments for the front forks and rear shock absorber. You also get the reference points for swingarm pivot maintenance and hydraulic brake bleeding. Critical fastener torques are clearly listed for steering ring nuts and caliper hardware, provided in Nm, m-kg, and ft-lb formats. Key specifications documented include a 0.75-liter transmission oil capacity, a 1.20-liter radiator capacity, ignition timing at 0.18 mm B.T.D.C., and a specified 0.5–0.6 mm spark plug gap.