The Yamaha WR426F, produced from 2000 to 2008, is a high-performance dual-sport motorcycle renowned for its robust 4-stroke, liquid-cooled engine and exceptional off-road capabilities. Building on Yamaha's strong heritage in off-road racing, the WR426F was a significant model, featuring a 5-valve DOHC engine with a displacement of 426cc, delivering potent power and torque. Its engineering prioritizes reliability and durability, making it a favored choice for enthusiasts and competitors alike. The motorcycle is equipped with hydraulic disc brakes for effective stopping power and a 5-speed transmission for versatile performance across varied terrains. This comprehensive factory service repair manual provides complete workshop guidance for the Yamaha WR426F (2000-2008). It covers all essential aspects of maintenance, troubleshooting, and repair, including detailed procedures for the engine, transmission, fuel system, ignition, electrical systems, suspension, brakes, and chassis. With step-by-step instructions, hundreds of illustrations, and detailed diagrams, this manual is an indispensable resource for owners and technicians. It empowers users to perform everything from routine servicing, such as oil changes and chain adjustments, to complex engine overhauls and electrical diagnostics, ensuring the longevity and optimal performance of the WR426F.