2006 Yamaha YZ250(W)/W1 Service Manual (P/N 1P8-28199-32)

• Covers the liquid-cooled 2-stroke 249cc racing platform for the 2006 Yamaha YZ250(W)/W1
• Official Yamaha publication 1P8-28199-32 (first edition, May 2006)
• Features detailed exploded-view diagrams for engine and chassis assemblies, alongside extensive maintenance specification tables
• Acts as the definitive baseline reference for professional mechanics and dedicated builders tuning the 2006 YZ250

Document Content Breakdown

The 596-page publication delivers structured technical coverage across seven distinct chapters. It starts with machine identification, basic fuel mixing protocols, and essential hazard prevention. Properly maintaining competition motorcycles involves inherent risks. Relying on these factory-approved safety warnings and torque limits is crucial to prevent catastrophic part failure on the track.

From there, the chapters dive into comprehensive specifications. You get maintenance limits, torque values, and electrical system diagnostics. It also outlines regular inspection routines. The deep-dive technical sections map out engine disassembly, chassis adjustments, and specialized tuning data for the 5-speed constant-mesh transmission and the YPVS governor.

Technical Data and Specifications

Maintenance data sections provide the exact figures needed for precision assembly and teardowns. Since intake valve clearance does not apply to this 2-stroke design, the focus shifts to critical lower and upper end tolerances. Piston-to-cylinder clearance is strictly documented at 0.045–0.050 mm. For the fuel system, it covers the Keihin PWK38S carburetor, noting the standard #178 main jet for USA/CDN models. Coolant capacity hits 1.20 liters.

Every critical fastener gets covered in the torque tables. For instance, the cylinder head nut torque sits at precisely 25 Nm. Having these exact factory metrics on hand takes the guesswork out of high-performance rebuilds and ensures the motorcycle performs exactly as the manufacturer intended.