This manual covers the S3 Thunderbolt and S3T Thunderbolt models produced from 1997 to 2002. Motorcycles, founded by Erik Buell, are renowned for their innovative engineering, sportbike performance, and unique handling characteristics, often integrating engine technology into a compact, agile chassis. The S3 Thunderbolt exemplifies this philosophy, featuring a distinctive frame-in-frame design that doubles as an oil reservoir and a powerful 1200 cc air-cooled V-twin engine. These motorcycles were manufactured in East Troy, Wisconsin, USA, and are celebrated for their robust construction and distinctive riding experience. This comprehensive workshop manual provides detailed service and repair information for all major systems of the S3 Thunderbolt. It includes in-depth coverage of engine mechanicals, fuel and electrical systems, transmission, drivetrain, suspension, steering, brakes, and bodywork. The manual offers step-by-step instructions for routine maintenance, periodic checks, troubleshooting, and complete component disassembly and reassembly. With clear text, detailed diagrams, and complete wiring schematics, this resource is designed to assist professional mechanics, experienced DIY enthusiasts, and informed owners in maintaining and repairing their vehicles effectively, ensuring optimal performance and longevity.