This manual covers the KTM 400 LC4 Enduro and 660 LC4 Enduro models produced between 1998 and 2005. KTM is renowned for its high-performance off-road motorcycles, and the LC4 platform, known for its robust single-cylinder engine, is a cornerstone of this reputation. These dual-sport motorcycles are engineered for challenging off-road conditions and versatile on-road use, featuring a liquid-cooled LC4 engine, a strong chromium-molybdenum steel trellis frame, and typically equipped with high-quality WP suspension and Brembo braking systems. Their design emphasizes power, durability, and rider engagement, making them a popular choice for adventure and trail riding.

This comprehensive service and repair manual provides detailed information essential for the maintenance and repair of your KTM 400 LC4 Enduro or 660 LC4 Enduro. It covers all major systems, including in-depth engine disassembly and assembly, fuel system maintenance, ignition and electrical systems, cooling, transmission, suspension, and braking systems. The manual includes procedures for preventative maintenance, troubleshooting common issues, engine and suspension rebuilds, and detailed technical specifications such as torque values, clearances, and wiring diagrams. This resource is designed to assist owners, mechanics, and technicians in ensuring the optimal performance and longevity of these capable motorcycles.