This manual covers the 1990 Quad Runner, a robust and popular entry-level All-Terrain Vehicle (ATV) renowned for its reliability and suitability for recreational trail use. Designed as a stepping stone into off-roading, the LT80L features a 2-stroke, air-cooled 72 cc engine, an automatic CVT transmission, and rear-wheel drive. Its engineering quality, a hallmark of off-road legacy, ensures dependable performance for young riders and enthusiasts alike. This comprehensive workshop repair service manual provides detailed information for the maintenance, repair, and troubleshooting of your 1990 Quad Runner. It covers essential systems including the engine, fuel system, transmission, brakes, suspension, steering, and electrical system. Within its approximately 200-300 pages, you will find routine maintenance procedures, diagnostic steps for common issues, major repair instructions, and critical technical specifications, empowering owners and technicians to keep this classic ATV in optimal condition.