This manual covers the 400 and 500 models, including DUSE and H.O. variants, produced between 2001 and 2004. These versatile all-terrain vehicles are engineered for a wide range of outdoor activities, from utility work to recreational trail riding. Known for their robust construction, reliable performance, and comfortable ride, the series offers a blend of power and handling that has made it a popular choice in the powersports market. The integrated On-Demand All-Wheel Drive system provides exceptional traction, while the liquid-cooled engines deliver consistent power. This comprehensive factory service manual provides essential information for the maintenance, repair, and troubleshooting of your 400 or 500. It details all major systems, including the engine, drivetrain, suspension, brakes, and electrical systems, offering step-by-step procedures, diagnostic guidance, and detailed technical specifications such as torque values and fluid capacities. This manual is an indispensable resource for owners, DIY enthusiasts, and professional technicians aiming to ensure the optimal performance, longevity, and safe operation of their vehicle.