This manual covers the KTM 125 SX, 125 MXC, 125 EXC, 200 SX, 200 MXC, and 200 EXC models produced between 1999 and 2002. These motorcycles, featuring a 2-stroke, single-cylinder, liquid-cooled engine from the KTM 125/200 LC2/LC4 family, are renowned for their performance-oriented design and agile handling, reflecting KTM's strong heritage in off-road motorsports. Whether configured for Cross Country (XC), Motocross (MXC), or Enduro (EXC) use, these bikes are engineered for demanding off-road conditions, offering a potent combination of power and responsiveness. Their robust construction, utilizing components like chromium-molybdenum steel frames and often Brembo braking systems, underscores their commitment to durability and rider control.

This comprehensive workshop service repair manual provides essential information for owners, mechanics, and technicians. It details engine mechanical and electrical systems, chassis, suspension, brakes, cooling, fuel, and exhaust systems. Coverage includes routine maintenance procedures, in-depth troubleshooting guides for common issues such as power valve sticking and clutch wear, and complete engine rebuild instructions with precise torque specifications. Furthermore, the manual offers guidance on suspension servicing, brake overhauls, and electrical system diagnostics, ensuring the optimal performance, reliability, and longevity of your KTM motorcycle.