This manual covers the Yamaha XT660R and XT660X models from the 2004 production year. These motorcycles are known for their torquey, liquid-cooled 660cc single-cylinder engines, robust chassis, and reliable electronic fuel injection systems. The XT660R is designed for dual-sport and light off-road use, offering versatility and capability, while the XT660X provides aggressive street performance. Yamaha's heritage of innovation and reliability underpins these models, which competed effectively in their respective market segments by balancing performance with user-friendliness.

This Factory Service Manual provides comprehensive guidance for the service and repair of your Yamaha XT660R or XT660X. It details maintenance procedures, including oil changes, filter replacements, and valve clearance checks, as well as in-depth repair procedures for engine, transmission, chassis, and electrical systems. Troubleshooting guides with diagnostic flowcharts are included to help identify and resolve common issues. This manual is an essential resource for owners, mechanics, and technicians, ensuring proper maintenance and repair to keep your motorcycle in optimal condition.