This manual covers the engine systems for KTM SX and MXC series motorcycles, specifically those equipped with 250cc, 300cc, and 380cc 2-stroke engines produced between 1999 and 2002. KTM, renowned for its "Ready to Race" philosophy, built these models for competitive off-road use, emphasizing performance and durability. The 2-stroke engines featured in this range are characterized by their single-cylinder, reed valve induction design and liquid cooling, delivering approximately 45-60 horsepower. This documentation is a vital resource for maintaining and repairing these potent machines, which have a strong heritage in motocross and enduro racing.

This comprehensive 153-page engine repair manual provides in-depth coverage of all engine systems, including top-end and bottom-end rebuilds, carburetor, ignition, clutch assembly, crankshaft, and power valve systems. It details essential procedures such as disassembly, inspection, cleaning, component replacement, and torque specifications, along with troubleshooting common engine issues and basic tuning guidance. This manual is designed to assist owners, mechanics, and technicians in performing detailed engine overhauls and ensuring the optimal performance and longevity of their KTM SX or MXC motorcycle.