The Yamaha TRI-Z 250, produced between 1985 and 1986, is a performance-oriented All-Terrain Vehicle (ATV) renowned for its powerful two-stroke engine and advanced suspension for its era. As Yamaha's flagship sport ATV, it competed with other high-performance models, offering a sport-focused ergonomic design and a high-revving 239cc engine. Its lineage traces back to Yamaha's early innovations in ATV manufacturing, cementing its status as a significant model in the evolution of performance ATVs.

This comprehensive service and repair manual provides factory-level diagnostic and repair information for the 1985-1986 Yamaha TRI-Z 250. It covers all essential systems, including detailed procedures for engine overhaul, carburetion, chassis components, electrical systems, and braking. With step-by-step repair instructions, troubleshooting guides, and wiring diagrams, this manual is an indispensable resource for owners and technicians seeking to maintain and restore the TRI-Z 250 to optimal performance.