This manual covers the WR400F and WR426F models from the 2001 production year. These off-road motorcycles are designed for enduro and motocross riding, known for their robust 5-valve titanium cylinder head design, reliable engine performance, and excellent handling. They are engineered for riders seeking a durable, high-performance machine capable of tackling challenging terrains. The WR series represents a strong commitment to the 4-stroke off-road segment, offering a blend of power and agility for both competitive riders and enthusiasts.

This comprehensive workshop manual provides detailed guidance for the diagnosis, repair, and maintenance of your WR400F or WR426F. It covers all essential systems, including the engine, fuel system, transmission, drivetrain, suspension, brakes, and electrical system. Within its pages, you will find step-by-step repair procedures, routine maintenance schedules, troubleshooting charts for common issues, and critical technical specifications such as torque values and fluid capacities. This resource is invaluable for owners and technicians alike to ensure the optimal performance and longevity of the motorcycle.