The Mongoose KXR 90 and KXR 50 ATVs, produced between 2003 and 2007, represent an offering in the recreational ATV segment. These models are known for their robust, air-cooled, 2-stroke engines, with displacements of approximately 89cc for the KXR 90 and 49cc for the KXR 50. They feature automatic Continuously Variable Transmissions (CVT) and chain drive to the rear axle, designed for ease of operation and suitability for youth and recreational riders. A Taiwanese manufacturer is recognized for providing value in its product categories. This comprehensive workshop service repair manual provides in-depth guidance for all Mongoose KXR 90 and KXR 50 models from 2003-2007. It covers every aspect of maintenance, from routine servicing like oil changes and filter replacements to complete engine and transmission rebuilds. Detailed instructions are provided for all major systems, including the fuel, ignition, lubrication, cooling, drivetrain, braking, suspension, steering, and electrical systems. Furthermore, the manual includes troubleshooting procedures for common issues, diagnostic steps, and clear, step-by-step instructions with accompanying pictures, empowering owners and technicians to effectively maintain and repair their vehicles.