This manual covers the SM 400/450 R Supermoto motorcycles manufactured between 2003 and 2004, including specific variants for USA/CDN-AUS markets. With its strong heritage in off-road and performance motorcycles, these models were engineered to deliver a dynamic riding experience. The SM 400 R and SM 450 R represent a blend of robust construction and performance-oriented design, making them suitable for both spirited riding and everyday use. This service repair workshop manual is designed to provide comprehensive information for maintaining and repairing these capable machines. The purpose of this extensive manual is to serve as the definitive guide for owners and technicians. It encompasses detailed step-by-step repair instructions for all major components, including engine disassembly and reassembly, cooling systems, suspension, brakes, and electrical systems. The manual also provides essential scheduled maintenance procedures, troubleshooting guides for common issues, and critical technical specifications such as torque settings and fluid requirements. With hundreds of illustrations and diagrams, including detailed wiring schematics, this resource ensures that owners and mechanics have the necessary information to keep their SM 400/450 R in optimal working condition.