The 2005 Yamaha YZ250F is a high-performance motocross motorcycle engineered for competition. Building on Yamaha's extensive motorsports legacy, this model was designed to deliver agility and potent power delivery, making it a formidable contender in the 250cc four-stroke class. Its advanced four-stroke, liquid-cooled engine, featuring a DOHC 4-valve design and a 249cc displacement, provides approximately 39-40 horsepower. The YZ250F is renowned for its robust aluminum alloy frame, sophisticated suspension system, and hydraulic disc brakes, all contributing to its reputation for competitive performance and handling characteristics.

This comprehensive service manual provides detailed information for the maintenance, repair, and overhaul of the 2005 Yamaha YZ250F. It covers all essential systems, including the engine, fuel system, transmission, chassis, suspension, and electrical components. The manual offers step-by-step procedures for routine maintenance, engine rebuilds, suspension servicing, and brake system repairs, along with troubleshooting guides and technical specifications. Its purpose is to equip owners, mechanics, and technicians with the knowledge required to maintain the motorcycle's peak performance and ensure its longevity.