This manual covers the 2009 KTM 450 SX-F, 450 XC-F, 505 SX-F, and 505 XC-F models. These high-performance off-road motorcycles are renowned for their racing capabilities, featuring potent four-stroke engines and advanced chassis designs. KTM's heritage in motocross and cross-country racing is evident in the engineering quality and reliability of these models, which are built for competitive use. This factory service repair manual provides comprehensive coverage for all aspects of maintenance, diagnostics, and repair. It includes detailed information on the powertrain, chassis, and electrical systems, along with step-by-step procedures for scheduled maintenance, troubleshooting, and component rebuilding. With factory-level technical depth, including diagrams and schematics, this English-language manual is an essential resource for owners, mechanics, and technicians to ensure optimal performance and longevity of their KTM motorcycles.