The KTM 400 LC4-E, produced between 1998 and 2005, is a versatile dual-sport motorcycle renowned for its powerful LC4-E engine. This liquid-cooled, four-stroke single-cylinder engine delivers strong, torquey performance, making the 400 LC4-E well-suited for both off-road adventures and on-road commuting. Building on KTM's strong off-road racing heritage, this model offers a robust chassis and capable suspension, typically featuring WP components, designed for durability and responsive handling. Its engineering emphasizes a balance of performance and practicality, establishing it as a capable machine in its class, competing with offerings from other major manufacturers of the era.

This comprehensive service repair manual provides detailed technical guidance for the KTM 400 LC4-E models from 1998 through 2005. It covers all essential aspects of maintenance, repair, and troubleshooting, including in-depth procedures for the engine's mechanical and electrical systems, fuel and cooling systems, transmission, brakes, suspension, and chassis. The manual includes routine maintenance schedules, engine rebuild instructions, carburetor tuning, and electrical diagnostics, along with troubleshooting guides for common issues. This resource is designed to assist owners, mechanics, and technicians in maintaining the optimal performance and longevity of their KTM 400 LC4-E.