The 2005 Yamaha YZ250 (model designation YZ250(T)/T1) is a high-performance motocross competition motorcycle renowned for its potent 2-stroke engine and agile handling. Building on Yamaha's extensive motorsports legacy, this model represents advancements in suspension, engine tuning, and chassis design, featuring Kayaba SSS (Speed-Sensitive System) front forks for enhanced performance. Its 249cc liquid-cooled engine, paired with a 5-speed transmission and hydraulic disc brakes, delivers exceptional power and control, making it a top choice for motocross racers and enthusiasts seeking peak performance and reliability in a competitive segment.

This comprehensive Factory Service Manual provides detailed technical information for the maintenance, repair, and troubleshooting of the 2005 Yamaha YZ250. It covers all major systems, including the engine, transmission, fuel, ignition, cooling, exhaust, suspension, brakes, wheels, and electrical components. The manual includes step-by-step repair procedures, diagnostic guides, tuning recommendations, and precise specifications, all supported by clear illustrations and diagrams. This resource is essential for owners, mechanics, and technicians to ensure the optimal performance, longevity, and safe operation of the YZ250.