The KTM 400 SX, produced from 2000 to 2007, is a performance-oriented motocross motorcycle renowned for its robust engineering and off-road capabilities. As a key competitor in its segment, this liquid-cooled, four-stroke machine features a single-cylinder engine with approximately 398cc displacement, a SOHC valve train, and a 5-speed transmission. Its design prioritizes agility and power, making it a capable choice for demanding motocross and off-road riding. The vehicle's construction includes a strong chromoly steel frame and high-performance WP suspension components, contributing to its reliability and rider control in challenging conditions.

This workshop repair service manual provides comprehensive guidance for the maintenance and repair of the KTM 400 SX. It covers all essential systems, including the engine, transmission, fuel, ignition, electrical, suspension, brakes, and chassis. Detailed procedures for scheduled maintenance, component overhauls, troubleshooting common issues, and technical specifications are included. This manual is an indispensable resource for owners and technicians, offering the necessary information to ensure the optimal performance, longevity, and safe operation of the motorcycle.