This manual covers the 2005 Bruin 250 and Big Bear 250 ATVs, renowned for their ruggedness and utility in off-road applications. The commitment to engineering quality and reliability is evident in these models, which are designed for dependable performance across various terrains. The Bruin and Big Bear lines represent a legacy of producing capable and user-friendly ATVs, making them a popular choice for both recreational riders and those needing a practical workhorse. This comprehensive service, repair, and maintenance manual provides detailed, step-by-step instructions for all aspects of the 2005 Bruin 250 and Big Bear 250. It covers engine overhaul, fuel and electrical systems, transmission, suspension, brakes, steering, chassis, and bodywork. Included are procedures for disassembly, assembly, repair, overhaul, inspection, and troubleshooting, along with essential torque specifications and detailed wiring diagrams. This English-language manual is designed to assist professional mechanics and experienced DIY enthusiasts in maintaining and repairing these ATVs to dealer-level standards.