This manual covers the 400 LC4 and 660 LC4 models, including variants such as the 400 EXC, 660 Rallye, 660 Supermoto, 660 SMC, 640 LC4 Enduro, and 640 LC4 Adventure, for the production years 1998 through 2003. The LC4 engine family, known for its robust liquid-cooled 4-stroke single-cylinder design, offered a potent combination of torque and durability, making these motorcycles highly capable in dual-sport and performance-oriented applications. Austrian engineering heritage, focused on off-road prowess, is evident in the LC4's adaptable platform.

This comprehensive service and repair manual, presented in English, provides detailed information essential for the maintenance and repair of your LC4 motorcycle. It covers all major systems, including engine overhaul, transmission, clutch operation, chassis components like suspension and brakes, and the electrical system. The manual includes step-by-step procedures for routine maintenance, troubleshooting common issues, and in-depth repair instructions, making it an invaluable resource for owners and technicians alike.