The 2005 Yamaha YZ250 is a high-performance motocross motorcycle renowned for its potent two-stroke engine, featuring the Yamaha Power Valve System (YPVS) for enhanced power delivery across the rev range. Built with a lightweight aluminum twin-spar frame and equipped with advanced Kayaba suspension components, including 48mm USD front forks and a Monoshock rear, this model offers exceptional handling and control on challenging off-road terrain. Its design prioritizes competitive performance, making it a favored choice for motocross racers and dedicated off-road enthusiasts seeking a reliable and powerful machine.

This comprehensive service repair manual provides detailed information for the maintenance and repair of the 2005 Yamaha YZ250 (chassis code T/T1). It covers a wide array of procedures, including engine disassembly and assembly, transmission and clutch service, suspension overhaul, carburetor tuning, and electrical system diagnosis. The manual includes essential technical specifications, torque values, fluid capacities, and troubleshooting guides to assist owners, mechanics, and technicians in keeping the motorcycle in optimal condition and performing necessary repairs efficiently.