This manual covers the KTM LC4 motorcycle models, including the 400 and 660 engine variants, for the production years 1998 through 2003. Known for its robust single-cylinder, four-stroke engine and dual-sport/enduro design, the LC4 platform embodies KTM's 'Ready to Race' philosophy, offering strong performance and durability in both off-road and on-road applications. The Austrian manufacturer's heritage in competitive motorcycling is evident in the LC4's engineering, making it a capable machine for a variety of riding conditions and a popular choice for riders seeking a versatile and powerful motorcycle.

This Factory Service Manual (FSM) provides comprehensive workshop service and repair information for the KTM LC4. It details procedures for engine disassembly and assembly, fuel system diagnostics and repair, electrical system troubleshooting, drivetrain maintenance, chassis and suspension servicing, and brake system overhauls. The manual includes essential maintenance tasks, troubleshooting guides, detailed diagrams, torque specifications, and electrical schematics, serving as an indispensable resource for owners, mechanics, and technicians to ensure the proper upkeep, repair, and optimal performance of their LC4 motorcycles.