This manual covers the 125 Duke and 200 Duke models produced between 1999 and 2003. These motorcycles are characterized by their lightweight steel trellis frames, potent single-cylinder liquid-cooled engines, and distinctive styling, offering an accessible entry into sporty urban riding and performance-oriented street use. The 125 Duke provides agile handling and efficiency, while the 200 Duke offers a significant power increase for a more dynamic riding experience. Both models emphasize rider engagement and performance heritage, featuring advanced suspension components for superior handling and road feel. This comprehensive English-language repair service manual provides detailed information essential for the maintenance, diagnosis, and repair of your 125 or 200 Duke. It covers all major systems, including the engine, transmission, chassis, front and rear suspension, brakes, and electrical system, with specific procedures for routine maintenance, engine and transmission overhauls, suspension rebuilds, and electrical diagnostics. The manual also includes critical technical specifications, torque values, and troubleshooting guidance, making it an invaluable resource for owners, mechanics, and technicians seeking to ensure the optimal performance, reliability, and longevity of these vehicles.