The WR400F, produced from 2000 to 2008, is a celebrated off-road motorcycle known for its potent 396cc liquid-cooled, 4-stroke, DOHC, 5-valve engine and robust construction. This model represents a significant point in off-road legacy, offering a blend of power and agility suitable for demanding enduro and trail riding. Its engineering prioritizes performance and reliability, making it a capable machine for enthusiasts and competitive riders alike. This comprehensive Factory Service Repair Manual provides detailed information for the WR400F across all its styles and production years, from 2000 through 2008. It covers essential maintenance procedures, general repairs, and in-depth overhauls of the engine, chassis, and electrical systems. With factory-level diagnostic procedures, troubleshooting guides, and specific technical data, this manual serves as an indispensable resource for owners, DIY mechanics, and professional technicians to ensure the optimal care, maintenance, and repair of their WR400F.