The Yamaha YFM200 and YFM225 Moto-4 are versatile All-Terrain Vehicles (ATVs) designed for recreational and utility purposes. Produced primarily in the late 1980s and early 1990s, these models are characterized by their reliable air-cooled, four-stroke engines, with displacements of approximately 196cc for the YFM200 and 223cc for the YFM225. Key features include shaft-driven 2WD, an automatic transmission with reverse, and an electric start system with recoil backup. These ATVs competed in the entry-level to mid-range market, offering a blend of practicality and performance, and are known for their durable construction and ease of maintenance, reflecting an extensive legacy in ATV manufacturing. This comprehensive workshop service repair manual provides in-depth guidance for the Yamaha YFM200 and YFM225 Moto-4 ATVs. It covers all essential aspects of maintenance, repair, and troubleshooting, including detailed procedures for engine systems, fuel and ignition systems, lubrication, cooling, transmission, driveline, suspension, brakes, and steering. The manual also details the electrical system, body and frame, exhaust, wheels, tires, clutch, and instrument cluster. With step-by-step instructions, diagnostic charts, and technical specifications such as torque values and fluid capacities, this manual is an indispensable resource for owners and technicians aiming to maintain the optimal performance and longevity of their vehicles.