This manual covers the KTM 400 LC4 and 660 LC4 models produced between 1998 and 2003. These motorcycles are powered by the robust LC4 single-cylinder, four-stroke engine, known for its strong torque and reliable performance, making them suitable for a variety of riding conditions. KTM has a strong heritage in performance-oriented motorcycles, and the LC4 platform exemplifies this with its engineering quality and capabilities, whether for dual-sport or street applications.

This comprehensive service and repair manual provides detailed information for owners and technicians. It covers essential maintenance procedures, including routine checks, fluid changes, and component servicing, as well as in-depth repair instructions for engine, chassis, and electrical systems. The manual also includes troubleshooting guides and technical specifications, ensuring that users can effectively maintain and repair their KTM LC4 motorcycles, preserving performance and longevity.