This manual covers the KTM 125 SX, 125 EXC, and 200 EXC models produced between 1998 and 2003. These liquid-cooled, two-stroke, single-cylinder motorcycles are renowned for their potent power delivery, agile handling, and robust build quality, embodying KTM's 'Ready To Race' philosophy. The 125 models, with a displacement of 125 cc and producing approximately 30-35 HP, are ideal for motocross and younger riders, while the 200 EXC offers a slight increase in displacement to 200 cc and an estimated 35-40 HP, providing a torque advantage for enduro riding. Both variants feature a steel perimeter frame, advanced WP suspension, and powerful hydraulic disc brakes, making them highly capable off-road machines.

This comprehensive Engine Repair Manual provides detailed information for the maintenance, troubleshooting, and repair of your KTM motorcycle. It covers all essential engine systems, including the fuel system, ignition system, lubrication, cooling, and transmission. You will find step-by-step instructions for engine teardown, component inspection, and reassembly, along with specific torque values and clearance measurements. The manual also includes diagnostic charts for common issues and guidance on specialized tools required for service. This resource is designed to assist owners, mechanics, and technicians in keeping these performance-oriented off-road motorcycles in optimal condition.