This manual covers the TRI-Z 250, a high-performance three-wheeler ATV produced for the 1985 and 1986 model years. As a significant model in motorsports legacy, the TRI-Z 250 was a pioneer in the performance ATV segment, known for its powerful 236cc liquid-cooled, 2-stroke engine, aggressive styling, and performance-oriented chassis. It offered significant off-road capability and was a direct competitor to models like the Honda TRX and Suzuki QuadRunner series. Engineering philosophy emphasizes performance and reliability, and the TRI-Z 250 exemplifies this, setting benchmarks for sporty three-wheelers of its era. This comprehensive workshop service repair manual, written in English, provides extensive guidance for owners, mechanics, and restoration enthusiasts. It details all models, engines, and transmissions, covering a wide array of systems including the fuel, cooling, engine, clutch, lubrication, drivetrain, brakes, suspension, steering, frame, and electrical systems. The manual offers step-by-step procedures for service, maintenance, troubleshooting, diagnostics, disassembly, assembly, cleaning, and reinstallation, complete with critical specifications, detailed illustrations, and diagrams. It also addresses common issues and includes information on special tool requirements, ensuring thorough maintenance and repair of the TRI-Z 250.