This manual provides comprehensive service and repair information for the 400, covering model years 1998 through 2003. Renowned for its off-road prowess and unique Swedish engineering heritage, the 400 was a significant offering in the Enduro and Motocross segments, competing with established brands through its robust four-stroke, single-cylinder engine. This period represents a distinct phase of development, and this guide aims to support owners and technicians in maintaining these capable machines.

This Service Repair Manual offers detailed coverage of all major systems, including complete engine overhaul procedures, fuel and ignition system diagnostics, cooling and exhaust system maintenance, transmission and drivetrain servicing, suspension and braking system repairs, and electrical system troubleshooting. It includes routine maintenance schedules, detailed troubleshooting guides, engine rebuild procedures, and specific torque values. The manual is designed to empower users to perform comprehensive maintenance and repairs, ensuring the longevity and optimal performance of their 400.