The Yamaha YZ250, a 2011 model, is a highly regarded motocross competition motorcycle renowned for its potent liquid-cooled, 2-stroke engine equipped with the Yamaha Power Valve System (YPVS). Its engineering excellence is evident in the lightweight aluminum bilateral beam frame, designed for superior rigidity and handling, and the industry-leading KYB Speed Sensitive System (SSS) inverted front forks and KYB monoshock rear suspension. These features, combined with powerful hydraulic disc brakes and a responsive chassis, contribute to its exceptional performance and rider control, making it a formidable machine for motocross riders and enthusiasts.

This comprehensive Factory Service Manual provides detailed guidance for the maintenance, repair, and troubleshooting of your 2011 Yamaha YZ250. It covers all essential systems, including complete engine mechanicals, the 6-speed transmission, fuel system with its Mikuni TMX38 carburetor, electrical and ignition systems, cooling system, chassis, and both front and rear suspension and brakes. The manual offers step-by-step instructions for engine and suspension rebuilds, brake system overhauls, carburetor tuning, and preventative maintenance, along with troubleshooting charts and detailed technical specifications, ensuring owners and technicians can effectively maintain this competition-focused motorcycle.