This manual covers the KTM LC4 400 and 660 models produced between 1998 and 2003. Known for its robust, high-performance single-cylinder engine and agile chassis, the LC4 platform was engineered for versatility, excelling in dual-sport, supermoto, and off-road applications. Its Austrian heritage is rooted in racing, translating into a focus on rider engagement and durable performance. These models are distinguished by their strong torque output, premium suspension components, and adaptable nature, making them a popular choice for riders seeking a capable and exciting machine for various riding environments.

This comprehensive workshop service and repair manual provides detailed guidance for owners and technicians. It encompasses all aspects of maintenance, from routine servicing and fluid changes to complete engine and gearbox rebuilds. The manual includes in-depth troubleshooting procedures, diagnostic charts, and step-by-step instructions for component repair and replacement. Key areas covered include the engine, fuel system, ignition, transmission, suspension, brakes, and electrical systems, along with chassis and bodywork. Detailed diagrams, exploded views, torque specifications, and information on special tools are provided to ensure accurate and efficient maintenance and repair.