This manual covers the Yamaha XT660R and XT660X models from 2004, representing the first generation of the XT660 series. These motorcycles are engineered as versatile dual-sport and supermoto machines, respectively, powered by a robust 660cc, single-cylinder, liquid-cooled engine with electronic fuel injection. The XT660R is designed for riders seeking capability in both on-road commuting and light off-road exploration, featuring spoked wheels and longer-travel suspension. In contrast, the XT660X offers a sporty urban performance focus with cast wheels, shorter-travel suspension, and street-biased tires. Both models are built with renowned engineering quality, aiming to provide reliability and distinctive styling within their respective segments.

This comprehensive service repair manual provides detailed guidance for the maintenance, troubleshooting, and repair of your Yamaha XT660R or XT660X. It covers all essential systems, including engine management, fuel and cooling systems, chassis components, and the electrical system, complete with wiring diagrams. Routine maintenance procedures, major repair instructions, and specific adjustments are clearly outlined. The manual is designed to assist owners, mechanics, and technicians in efficiently diagnosing and resolving issues, ensuring the optimal performance and longevity of the motorcycle. With its in-depth technical data, rebuild procedures, and diagnostic capabilities, this English-language manual serves as an indispensable resource.