This manual covers the Trail Boss 250 R-ES All-Terrain Vehicle (ATV) models produced between 1985 and 1995. The Trail Boss line represents a significant part of the powersports industry history, known for its rugged design and versatility. These ATVs were engineered for a variety of off-road applications, offering a robust platform for recreational riding and utility tasks. The R-ES designation indicates a model featuring both recoil and electric start for user convenience. This comprehensive workshop service manual provides detailed repair and overhaul procedures for all major systems of the Trail Boss 250 R-ES. Coverage includes the engine and powertrain, electrical system, chassis, and body components. The manual offers guidance on routine maintenance, diagnostics, troubleshooting, and component installation, making it an invaluable resource for both experienced mechanical technicians and knowledgeable ATV owners. It is designed to facilitate the proper maintenance and repair of these vehicles, ensuring their continued performance and reliability.