This manual covers the Bruin 350 and 400 All-Terrain Vehicles (ATVs) produced between 2004 and 2006. As part of an esteemed ATV legacy, the Bruin line offers a blend of utility, comfort, and accessibility, making it a capable choice for various terrains and tasks. The Bruin 350 typically features a solid rear axle, while the 400 often incorporates independent rear suspension for enhanced ride quality. These ATVs are powered by liquid-cooled, 4-stroke engines, with the 350 featuring a 2-valve configuration and the 400 a 4-valve setup, both managed by a reliable carbureted fuel system and an automatic Continuously Variable Transmission (CVT) with high/low range and reverse. This comprehensive service and repair manual provides detailed guidance for maintaining and troubleshooting your Bruin. It includes extensive information on engine overhaul, drivetrain service, chassis maintenance, and electrical system diagnostics, complete with high-resolution wiring diagrams. The manual is designed to assist DIY enthusiasts, independent mechanics, and ATV owners by offering step-by-step procedures, troubleshooting guides for common issues, and essential technical specifications, including fluid types and capacities, service intervals, and rebuild instructions. With its user-friendly layout and English language content, this manual serves as an indispensable resource for ensuring the longevity and optimal performance of your vehicle.