This manual covers the 400, 501, and 600 models from the 1999 model year. These off-road motorcycles are known for their single-cylinder, four-stroke engines, with displacements ranging from approximately 400cc to 600cc, and are designed for motocross and enduro disciplines. They feature robust chromoly steel frames, hydraulic disc brakes front and rear, and a 6-speed manual transmission with a hydraulically operated wet multi-plate clutch. With an emphasis on performance and competition, these models represent Swedish engineering focused on off-road capability.

This comprehensive workshop service manual provides in-depth technical information for owners and independent repair shops. It details routine maintenance, engine mechanics including disassembly and assembly, fuel and ignition systems, transmission, suspension, brakes, and electrical systems. The manual includes troubleshooting guides, diagnostic procedures, and complete rebuild instructions for major components. Its professional-quality content, presented in English with high-resolution diagrams, empowers users to perform maintenance and repairs effectively, reducing reliance on specialized services and ensuring optimal vehicle performance.