2009 Yamaha YZ250Y Owner's Service Manual

2009 Yamaha YZ250Y Technical Overview

• Covers 2009 Yamaha YZ250Y motocross motorcycles, including USA, CDN, AUS, NZ, and European market variants
• Official Yamaha publication P/N LIT-11626-22-55, 1st Edition, April 2008
• Contains 47 pages of detailed torque tables, cable routing diagrams, and exploded-view parts descriptions
• File is accessible from your device as soon as the order is placed
• Layout supports printing individual sections for shop-floor use
• This 1st edition document serves as the primary technical reference for the 2009 YZ250Y launch build, documenting specific carburetor settings and frame-specific torque values unavailable in earlier service literature

Engine and Chassis Documentation

This 2009 Yamaha YZ250Y owner's service manual provides comprehensive information for routine maintenance and tuning. The documentation details the disassembly and reassembly of the liquid-cooled 2-stroke engine, including internal specifications for the piston, cylinder, clutch, and 5-speed transmission. The text clarifies inspection criteria for critical components such as the reed valve assembly, water pump, and carburetor system, while providing clear guidelines for fuel-oil premix ratios and general bike preparation for competition use.

Specification Highlights and Torque Data

Specific technical sections cover chassis maintenance, including front fork and rear shock absorber damping adjustments, swingarm pivot service, and brake hydraulic bleeding. The manual lists precise torque values for chassis bolts, including steering ring nuts and caliper hardware, often providing values in Nm, m-kg, and ft-lb. The transmission oil capacity is documented at 0.75 liters during periodic changes, while radiator capacity is set at 1.20 liters. Ignition timing is specified at 0.18 mm B.T.D.C., and the spark plug gap is maintained between 0.5–0.6 mm. This official 244-page Yamaha OEM workshop manual covers the 2009 Yamaha YZ250Y, documenting engine, chassis, electrical, and fuel-system specifications for the 1P8-series build.

Reference only — always consult a certified technician before performing service on this equipment.