This manual covers the KTM 125 SX, 200 SX, 125 EXC, and 200 EXC models for the production years 1999 through 2003. These motorcycles are renowned for their competitive off-road performance, embodying KTM's 'Ready to Race' philosophy with lightweight chassis, potent two-stroke engines, and advanced WP suspension. Engineered for demanding motocross and enduro riding, these models have a strong heritage in motorsports, offering riders exceptional handling and power for their displacement.

This Workshop Service Repair Manual provides comprehensive guidance for the engine and related systems of your KTM motorcycle. It details procedures for complete disassembly, inspection, repair, rebuilding, troubleshooting, diagnostics, and reassembly of the engine, clutch, gearbox, cooling, lubrication, ignition, and fuel systems. The manual is designed to assist owners, mechanics, and technicians in maintaining and repairing these vehicles, ensuring optimal performance and longevity.