This manual covers the KTM 250/525 SX, MXC, and EXC models from 2003. These high-performance off-road motorcycles are engineered for demanding motocross, cross-country, and enduro riding. Known for their potent engines, advanced chassis, and WP suspension systems, KTMs of this era offer a competitive edge and are built for rigorous use. This factory service manual provides the essential technical data and procedural guidance necessary to maintain these specialized machines in optimal condition, reflecting KTM's strong heritage in off-road motorsports.

The scope of this comprehensive repair manual is extensive, detailing mechanical and electrical maintenance and repair procedures for the specified KTM models. It includes in-depth coverage of engine systems, fuel and ignition systems, cooling, transmission, suspension (front and rear), brakes, electrical systems, and frame/chassis components. The manual also provides guidance on routine maintenance, engine rebuilds, suspension servicing, carburetor overhauls, and electrical troubleshooting, along with detailed torque specifications and fluid requirements. This resource is designed to empower owners, mechanics, and technicians with the knowledge needed for accurate servicing and repair.