The KTM 400 SXC is a performance-oriented off-road motorcycle designed for competitive enduro racing and demanding trail riding. Produced between 1998 and 2005, this model is celebrated for its powerful, tractable engine, delivering strong mid-range torque ideal for challenging terrain. KTM's heritage in motorsports is evident in the 400 SXC's robust engineering and focus on rider capability, making it a capable machine for enthusiasts seeking a competitive edge. Its single-cylinder, liquid-cooled, four-stroke engine, featuring a SOHC 4-valve configuration, provides a potent package for its intended use.

This manual serves as a comprehensive guide to the maintenance, repair, and technical understanding of the KTM 400 SXC engine systems. It covers essential procedures ranging from routine servicing, such as oil changes and valve adjustments, to in-depth engine overhauls and component replacements. Detailed troubleshooting steps are provided for common issues, alongside critical technical specifications, torque values, and necessary special tools. This resource is invaluable for owners, mechanics, and technicians aiming to ensure the optimal performance, reliability, and longevity of their 400 SXC.