The LT-Z90 QuadSport, manufactured for the 2007, 2008, and 2009 model years, is a youth-oriented ATV designed for recreational riding and skill development. Built by a company renowned for its reliable and performance-focused vehicles, this model is part of the established QuadSport lineup. It features an 88 cc air-cooled, four-stroke engine with a Mikuni VM17 carburetor, an automatic CVT transmission, and a 2WD drive system. Safety is prioritized with an adjustable throttle limiter for speed control and a mechanical parking brake, complemented by aggressive grip footpegs and high-rise handlebars for rider comfort and control. This comprehensive Workshop Service Repair Manual provides detailed information for the LT-Z90 QuadSport, covering model codes LT-Z90K7, LT-Z90K8, and LT-Z90K9. With 258 pages of content, it serves as an invaluable resource for do-it-yourself enthusiasts and professional mechanics alike. The manual delves into essential areas including engine systems, fuel system, chassis, and the electrical system, offering step-by-step instructions for maintenance procedures such as oil changes, filter replacements, and valve adjustments, as well as detailed repair and troubleshooting guidance. It is presented in English and is formatted for easy use in a workshop or garage setting.