This manual provides comprehensive service and repair information for the Mongoose d50, a recreational ATV known for its value and suitability for entry-level riders. Built by a reputable Taiwanese manufacturer with a history dating back to 1964, the Mongoose series, including the d50 model, is designed for enjoyable off-road use. This particular model, powered by a likely 50cc engine, offers a balance of performance and ease of operation, making it a popular choice for younger riders and those new to ATVs. The engineering quality focuses on reliability and user-friendliness, ensuring a positive ownership experience for recreational enthusiasts. This workshop repair manual is meticulously designed to guide owners, DIY mechanics, and professional technicians through all aspects of maintaining and repairing the Mongoose d50. It covers a vast array of systems, including detailed procedures for general maintenance, engine service and repair, fuel and emission systems, transmission, braking, suspension, steering, and electrical systems. The manual also includes essential troubleshooting guides, technical specifications, wiring diagrams, and safety guidelines. Its purpose is to empower users with the knowledge and step-by-step instructions necessary to keep their vehicle in optimal condition, ensuring longevity and performance through informed maintenance and repair practices.