This manual covers the 450 SX-F, 505 SX-F, and 450 SXS-F models, renowned for their high-performance, 4-stroke single-cylinder engines. The legacy in off-road racing is evident in these motocross machines, which are engineered for competitive performance and reliability. These models are characterized by their advanced engineering, often featuring liquid-cooled engines, fuel injection, and hydraulic clutch actuation, all contributing to their 'Ready to Race' reputation. This comprehensive workshop service repair manual provides detailed information for the maintenance and repair of your motocross motorcycle. It covers essential areas including engine mechanicals, electrical systems, fuel systems, and includes a thorough troubleshooting guide for common issues. Step-by-step instructions, detailed illustrations, and specific technical data are provided to assist both DIY enthusiasts and professional mechanics in ensuring optimal performance and longevity of the vehicle.