This manual covers the Quadsport, also known as the LTZ90, for the model years 2007, 2008, and 2009. Designed as an entry-level youth ATV, the LT-Z90 builds upon an established reputation in powersports for reliable and performance-oriented vehicles. This model features an 88 cc air-cooled, four-stroke engine with a Mikuni VM16SH carburetor and an automatic Continuously Variable Transmission (CVT) with chain drive. Its engineering emphasizes durability and ease of use for younger riders, incorporating features like a throttle limiter and standard lighting for safety. This comprehensive factory repair service manual provides in-depth information for owners and technicians. It details complete tear-down and rebuild procedures, routine maintenance, and troubleshooting for all major systems, including the engine, transmission, fuel system, ignition, electrical components, chassis, suspension, and brakes. With 257 pages of English content, the manual includes detailed part diagrams, schematics, and wiring diagrams. It is designed to facilitate DIY repairs and professional workshop use, offering factory-level accuracy and detailed diagnostic procedures to ensure optimal vehicle performance and longevity.