This manual covers the 450 SX Racing models produced from 2000 through 2003. As a flagship motocross competition motorcycle, an Austrian manufacturer renowned for its off-road prowess, the 450 SX Racing represents a period of continuous development in this demanding sport. These machines were engineered for peak performance and were highly competitive in national and international championships, reflecting a commitment to quality and innovation in the motocross segment. This factory service repair manual provides comprehensive workshop information for the 450 SX Racing. It offers detailed, step-by-step instructions for complete disassembly, repair, and assembly of all major systems, including engine, fuel, cooling, and electrical components, supported by hundreds of illustrations. The manual also includes extensive maintenance procedures, troubleshooting guides for diagnosing issues, and technical specifications, making it an invaluable resource for owners and technicians aiming to maintain, repair, or restore these competition motorcycles.