The LT80M Quad Runner, produced in 1991, is a testament to heritage in creating accessible and reliable powersports vehicles. Designed for entry-level and youth riders, this All-Terrain Vehicle (ATV) features a simple, user-friendly operation, highlighted by its lightweight chassis and an automatic Continuously Variable Transmission (CVT). Its robust, air-cooled 2-stroke engine, coupled with essential safety features like full floorboards and an easily accessible engine kill switch, makes it an ideal choice for recreational use and learning the fundamentals of ATV riding. The LT80M embodies the commitment to quality engineering and durability, ensuring a dependable experience for its intended audience. This workshop repair service manual provides comprehensive guidance for the maintenance and repair of the 1991 LT80M Quad Runner. It covers all essential aspects of the vehicle, including detailed procedures for the engine, transmission, electrical system, suspension, brakes, and bodywork. The manual includes routine maintenance schedules, troubleshooting diagnostics for common issues, and in-depth instructions for component overhauls and adjustments. With clear diagrams, illustrations, and precise technical specifications, this resource is an invaluable tool for owners, mechanics, and technicians seeking to ensure the optimal performance, longevity, and safe operation of their LT80M.