The Yamaha YZ250, produced in 1991, is a high-performance, 2-stroke, off-road motorcycle designed for motocross racing and demanding off-road use. It represents a significant evolution in Yamaha's long and successful motocross heritage, featuring a powerful engine, potent suspension, and a competitive chassis for its era. Known for its race-proven design and strong performance, the YZ250 was a key contender in its class, offering enthusiasts a robust machine engineered for agility and speed on the track.

This comprehensive service and repair manual, written in English, provides expert-level guidance for maintaining and repairing the 1991 Yamaha YZ250. It covers detailed procedures for engine overhaul, transmission servicing, chassis maintenance, and electrical system diagnostics. The manual includes routine maintenance schedules, troubleshooting guides for common issues, and essential technical specifications such as torque values and fluid requirements. Its scope is designed to assist professional mechanics and experienced DIY enthusiasts in ensuring the optimal performance and longevity of this iconic motocross motorcycle.