This manual covers the 2006 400, 400 TBX, 400 TRV, 500, 500 TBX, 500 TRV, 650 H1, and 650 V-TWIN models. These ATVs are known for their robust build and off-road capabilities, featuring liquid-cooled, 4-stroke engines ranging from 375cc to 650cc. They offer versatile performance suitable for utility tasks and recreational trail riding, with options for automatic or manual transmissions and selectable 2WD/4WD drive modes. The engineering quality of ATVs from this era is recognized for reliability and durability in demanding conditions. This comprehensive 520-page English Service Repair Manual provides in-depth guidance for maintenance and repair. It includes detailed procedures for engine and transmission service, fuel and lubrication systems, cooling, electrical, drive, suspension, steering, and frame components. The manual also covers troubleshooting common issues, disassembly and assembly, and provides critical torque specifications and hundreds of illustrations. This resource is designed to empower both do-it-yourself owners and professional mechanics to effectively maintain and repair these vehicles, ensuring optimal performance and longevity.