The RS125, produced from 1993 to 2002, is an iconic lightweight supersport motorcycle renowned for its performance-oriented engineering and race-inspired design. As an entry-level sportbike, it offers agile handling and a premium feel, often drawing styling and chassis elements from larger models. This first-generation model, identified by the RP chassis code, features a liquid-cooled, two-stroke, single-cylinder engine with a displacement of approximately 124.8 cc, delivering impressive power for its class. Its sophisticated braking system, including a front single disc with a four-piston caliper and a rear single disc, along with a monoshock rear suspension, contributes to its dynamic capabilities. This comprehensive service repair manual provides detailed information for the maintenance and repair of all RS125 variants from 1993 to 2002. It covers essential systems including the fuel, cooling, and lubrication systems, engine top end, clutch, transmission, and final drive, as well as chassis components like wheels, brakes, suspension, steering, and frame. The manual also details the electrical system and general information. With step-by-step instructions, hundreds of photos and illustrations, and guidance on routine maintenance, troubleshooting, and complete disassembly, this manual is an invaluable resource for do-it-yourself owners and professional mechanics seeking to keep their RS125 in optimal condition.