This manual pertains to the Yamaha YZ426F, an off-road motorcycle renowned for its performance in motocross. Produced approximately from 2000 to 2002, this model represents a significant step in Yamaha's development of high-performance four-stroke motocross bikes. It features a 4-stroke, liquid-cooled, DOHC, single-cylinder engine with a displacement of approximately 426cc, delivering robust power output characteristic of competitive motocross machines. The motorcycle is built upon an aluminum, semi-double cradle frame and utilizes hydraulic disc brakes for both front and rear stopping power, ensuring responsive control on demanding terrain.

This comprehensive parts catalog is designed to assist Yamaha YZ426F owners, independent repair shops, and technicians in maintaining and restoring their motorcycles. It provides detailed part numbers and high-quality, depth illustrations for all components, from the engine's cylinder head and crankshaft to chassis elements, braking system parts, and electrical components. By offering accurate part identification and visual breakdowns, this manual facilitates efficient part ordering, aids in diagnosing potential issues with systems like the carburetor or valve train, and ultimately supports the longevity and optimal performance of the YZ426F.