2008 Yamaha YZ250X / YZ250W / YZ250 Service Manual (P/N LIT-11626-21-44)

The official 244-page factory workshop manual for the 2008 Yamaha YZ250X 2-stroke competition line. This publication provides the precise engineering data and assembly tolerances required for professional-grade maintenance. Having a searchable PDF on your shop tablet speeds up your workflow and eliminates guesswork during a top-end rebuild.

• Coverage: 2008 Yamaha YZ250X, YZ250W, and YZ250 (1P8-series)
• Official Publication: Yamaha P/N LIT-11626-21-44 (First edition, June 2007)
• Visuals: 47 exploded-view diagrams and 39 torque specification tables

Document Content and Structure

The manual is organized into seven core chapters that break down the entire machine. It starts with general information, covering machine identification codes and special tool requirements. The engine assembly sections offer deep-dive reference data on the exhaust, radiator, carburetor, cylinder, piston, clutch, and crankshaft. For the chassis, the documentation details the front and rear suspension, brake systems, and steering head.

Specification and Reference Data

Expect exact, shop-ready technical data regarding the powerplant and frame. Engine assembly charts list critical torque values, including 25 Nm for cylinder head nuts and 42 Nm for cylinder nuts. The intake and cooling specifications document a 1.20 L coolant capacity alongside a 30:1 premix ratio. You will also find carburetor setup details highlighting specific PWK38S main jet, pilot jet, and needle settings for different regional markets. Electrical reference values include charging coil resistance (44 to 1,080 ohms) and spark plug cap resistance (4–6 kΩ).

Always ensure the motorcycle is properly secured on a stable stand and wear appropriate protective gear before initiating any disassembly or teardown procedures based on these reference values.