This manual covers the LC4 Series motorcycles, including variants 400, 600, 620, 625, 640, and 660, produced between 1998 and 2003. These dual-sport and enduro motorcycles are known for their robust single-cylinder, liquid-cooled LC4 engine platform, offering versatility for both street and trail riding. Engineered with a focus on off-road performance and durability, the LC4 series is characterized by its capable chassis, often featuring a chromoly steel trellis frame and suspension components, making them suitable for adventure touring and demanding trail conditions.

This comprehensive repair and service manual provides detailed guidance for mechanical and electrical maintenance, troubleshooting, and repair. It covers essential procedures such as engine removal and disassembly, fuel system servicing, electrical system diagnosis, chassis and suspension maintenance, and brake system upkeep. The manual is designed to assist owners and technicians in performing routine maintenance, diagnosing common issues, and executing complex repairs, ensuring the optimal performance and longevity of the LC4 motorcycles.