This service repair manual provides comprehensive information for the KTM 400 SX, covering model years 2000 through 2007. The KTM 400 SX is a performance-oriented motocross and off-road competition motorcycle renowned for its powerful LC4 single-cylinder, four-stroke engine. Engineered for demanding terrain, this model is recognized for its competitive chassis and robust performance, making it a formidable machine in its class.

This manual serves as an essential resource for owners, mechanics, and technicians, detailing all aspects of maintenance, repair, and troubleshooting for the KTM 400 SX. It covers critical systems including the engine mechanicals, fuel system, ignition, clutch, transmission, electrical system, cooling, frame, suspension, brakes, and wheels. With step-by-step procedures for routine maintenance, engine rebuilds, carburetor servicing, and electrical diagnostics, this guide ensures the optimal performance and longevity of your vehicle.