The Kymco KXR 90 is an all-terrain vehicle designed for youth riders and entry-level off-road enthusiasts. Produced for the 2003 through 2007 model years, this ATV features a single-cylinder, air-cooled 90cc engine paired with an automatic Continuously Variable Transmission (CVT) and a chain drive to the rear axle. Its design emphasizes ease of use with simple controls, including a thumb throttle and handlebar-mounted brake levers, making it approachable for beginners. Built with durable components for off-road conditions, the Kymco KXR 90 offers a functional and reliable experience for its intended users. This workshop repair service manual provides comprehensive instructions for the maintenance and repair of the Kymco KXR 90. It covers detailed procedures for routine servicing, tune-ups, and complex repairs, including engine and transmission disassembly and reassembly. The manual also details the fuel, ignition, lubrication, exhaust, and electrical systems, as well as bodywork. With information often found in dealer service departments, this English-language manual aims to empower owners and technicians to perform repairs effectively, ensuring optimal performance and longevity of the vehicle, and includes guidance on special tools and safety precautions.