This manual covers the KTM 400 LC4 and 660 LC4 models produced between 1998 and 2003. These motorcycles, built on the robust LC4 platform, are renowned for their Austrian engineering, single-cylinder power, and versatility, making them capable machines for various riding environments. The LC4 engine family is celebrated for its strong torque and durable construction, embodying KTM's commitment to performance and reliability in demanding applications.

This comprehensive repair and service manual provides essential information for owners and technicians. It details routine maintenance, troubleshooting procedures, and major repair instructions for all major systems, including the engine, transmission, chassis, suspension, brakes, and electrical components. With clear illustrations and in-depth technical specifications, this manual is an indispensable resource for ensuring the optimal performance and longevity of your KTM 400 LC4 or 660 LC4.