This manual covers the YTM200, YFM200, and YTM225 All-Terrain Vehicles (ATVs) produced between 1983 and 1986. These models, including the Yamahauler, Tri-Moto, and Moto-4 variants, represent robust engineering and early contributions to the ATV market, known for their reliability and performance. This comprehensive guide is designed to assist owners and technicians in understanding, maintaining, and repairing these iconic machines, ensuring their continued operational capability. The scope of this manual is extensive, providing in-depth coverage of all major systems. It includes detailed procedures for engine tear-down and rebuild, clutch and transmission servicing, fuel and exhaust system maintenance, and electrical system diagnostics, complete with wiring diagrams. Furthermore, it offers guidance on front and rear suspension, steering, brake systems, and chassis components. Troubleshooting, general maintenance, tune-up procedures, and specific fluid specifications are also thoroughly explained, making this a complete resource for preserving the integrity and performance of your ATV.