This manual covers the 2007 450 SX-F and 505 SX-F, Austrian-engineered performance motocross bikes renowned for their competitive edge. These models, powered by liquid-cooled, single-cylinder, 4-stroke engines with displacements around 449.2 cc and 505 cc respectively, deliver substantial horsepower and torque optimized for demanding off-road racing conditions. Featuring a robust chromium-molybdenum steel frame, hydraulically operated multi-plate wet clutch, and advanced WP suspension components, the SX-F line prioritizes rider control and mechanical feedback, eschewing electronic rider aids for a pure racing experience. This comprehensive workshop service repair manual provides in-depth guidance for maintaining and repairing your 2007 450 SX-F or 505 SX-F. It covers all essential systems, including detailed engine overhaul, fuel system service, transmission and drivetrain maintenance, suspension and brake system repairs, and electrical system diagnostics with wiring diagrams. The manual also includes general maintenance procedures, troubleshooting guides, and specific rebuild instructions, making it an indispensable resource for do-it-yourself enthusiasts and professional mechanics alike. Its factory-quality information, presented in English with hundreds of illustrations, ensures accurate and efficient upkeep of these high-performance machines.