This manual covers the TC250, TC450, and TC510 motocross motorcycles, produced during the first generation following BMW's acquisition and prior to KTM's. These performance off-road bikes are known for their strong engines and capable chassis, designed to compete in the premium motocross segment. With a heritage rooted in Swedish engineering and a history of off-road racing success, motorcycles from this era, manufactured primarily in Italy, offered a distinct blend of power and handling. This comprehensive workshop repair manual provides detailed guidance for owners and technicians. It covers all essential aspects of maintenance, diagnosis, and repair, including engine overhaul, drivetrain servicing, chassis component care, and electrical system troubleshooting. The manual includes routine maintenance procedures, in-depth repair instructions for major components, diagnostic charts for common issues, and critical technical specifications. Its purpose is to ensure the optimal performance, reliability, and longevity of your TC series motocross bike.