This manual covers the 2007 motocross motorcycles. These are premier motocross platforms. These high-performance machines, powered by liquid-cooled, single-cylinder, four-stroke engines with displacements of 450cc or 505cc, are designed for competitive riders and enthusiasts. They feature advanced chassis designs, typically utilizing a chromium-molybdenum steel central double-cradle frame, and are equipped with hydraulic disc brakes for reliable stopping power. The engineering quality of these motorcycles is reflected in their consistent high ratings and championship wins across various racing series. This comprehensive Engine Service Repair Manual in English provides detailed instructions for maintaining and repairing your motocross motorcycle. It covers essential areas including engine removal and installation, complete engine disassembly and reassembly, individual component servicing, and troubleshooting common issues. The manual also includes periodic maintenance schedules, fluid specifications for engine oil, coolant, and brake fluid, as well as electrical system information such as wiring diagrams. With step-by-step instructions and high-quality diagrams, this manual is an invaluable resource for both DIY enthusiasts and professional technicians aiming to ensure the optimal performance and longevity of their 2007 SX-F series motorcycle.