This manual covers the 2001 Sportsman 400, Sportsman 500 DUSE, and Sportsman 500 H.O. All-Terrain Vehicles (ATVs). An American manufacturer with a history dating back to 1954, is renowned for its robust and reliable ATVs, with the Sportsman line being a cornerstone of their offerings. These vehicles are engineered for a wide range of utility and recreational purposes, designed to handle demanding terrains and provide a comfortable riding experience. The 2001 models feature liquid-cooled, 4-stroke engines in 400cc and 500cc variants, equipped with Variable Transmission (PVT) automatic systems and shaft drive with All-Wheel Drive engagement. This full workshop service and repair manual provides comprehensive, dealer-level technical information for the 2001 Sportsman ATVs. It serves as an essential resource for owners and technicians, detailing everything from scheduled maintenance, fluid changes, and lubrication to complete component rebuilds and troubleshooting. The manual covers all major systems including the engine, fuel system, PVT transmission, drivetrain, brakes, suspension, and electrical systems. It also includes specific wiring diagrams, torque specifications for engine and chassis components, and guidance on common issues, ensuring that owners can effectively maintain, repair, and optimize their vehicles.