This manual covers the KFX450R, a high-performance All-Terrain Vehicle (ATV) renowned for its capabilities in the sport ATV segment. Engineered for aggressive riding, the KFX450R features a robust 449cc liquid-cooled, single-cylinder engine with a 4-stroke DOHC configuration and fuel injection, delivering potent power and responsive throttle control. Its chassis is designed for agility and stability, incorporating independent front suspension with adjustable shocks and a swingarm rear suspension, ensuring excellent handling across varied terrains. The vehicle is equipped with dual hydraulic disc brakes at the front and a single hydraulic disc at the rear for reliable stopping power, complemented by a mechanical parking brake. This comprehensive Factory Service Repair Manual provides detailed guidance for the maintenance, repair, and troubleshooting of the KFX450R. It covers all major systems, including the engine, transmission, fuel system, cooling system, chassis, and electrical components. Within its extensive pages, you will find step-by-step procedures for routine maintenance, component disassembly and reassembly, diagnostics, and technical specifications essential for ensuring the optimal performance and longevity of your ATV. This resource is invaluable for owners and technicians seeking factory-level expertise to service and maintain the KFX450R effectively.