This manual covers the KFX-400 All-Terrain Vehicle (ATV) produced between 2003 and 2008. Designed for off-road recreational riding and utility tasks, the KFX-400 is an ATV engineered for performance and durability. This comprehensive guide provides the essential information required to understand, operate, and maintain your vehicle effectively, ensuring its reliability and optimal function for all your adventures. This Service Repair Manual & Parts Manuals, spanning 302 pages, offers extensive coverage from basic to advanced service work, including full teardown and rebuild procedures. It features detailed step-by-step instructions, exploded parts diagrams with part numbers, and clear wiring diagram schematics. The manual is designed to assist owners, mechanics, and technicians in performing routine maintenance, troubleshooting issues, and completing repairs, thereby maximizing the longevity and performance of the KFX-400.