This manual covers the Yamaha XT-660, a versatile dual-sport motorcycle produced from the early 2000s. Known for its torquey single-cylinder, 4-stroke engine and robust Yamaha engineering, the XT-660 is designed for riders seeking a capable machine for both on-road commuting and off-road exploration. Its durability and adaptable nature have made it a popular choice in its segment, continuing the legacy of Yamaha's renowned XT series. The 659.7 cc engine, featuring SOHC with 5 valves and electronic fuel injection, provides manageable power delivery suitable for a wide range of riding conditions.

This workshop service manual provides comprehensive guidance for professional technicians and experienced DIY mechanics. It details essential maintenance procedures, including scheduled servicing, fluid changes, and component checks, alongside in-depth troubleshooting steps for diagnosing and resolving faults. The manual also covers complete repair and rebuild procedures for all major systems, such as the engine, fuel, ignition, transmission, chassis, suspension, brakes, and electrical systems. Technical specifications, diagrams, and torque values are included to ensure accurate and effective maintenance and repair, enabling owners and technicians to keep the Yamaha XT-660 in optimal condition.