The Triumph Thunderbird Sport, produced between 1997 and 2004, represents a blend of classic roadster design and modern performance. Powered by a liquid-cooled, DOHC, inline three-cylinder engine displacing 885 cc, this model is renowned for its substantial torque and distinctive character. Evolving from an established parallel twin platform, the Thunderbird Sport was engineered with an emphasis on a comfortable riding position and robust performance, making it a notable competitor in its segment. Its UK manufacturing heritage and praised torquey triple engine contribute to its enduring appeal among enthusiasts. This comprehensive Workshop Service Repair Manual provides detailed guidance for the Triumph Thunderbird Sport 900 models from 1997 through 2004. Covering a wide array of systems including the engine, transmission, chassis, and electrical components, this manual offers step-by-step instructions for maintenance, diagnostics, and repair. It includes procedures for routine servicing, component overhauls, adjustments, and troubleshooting, supported by detailed diagrams and specifications. This resource is an essential tool for owners and technicians seeking to maintain the reliability and performance of their Triumph Thunderbird Sport.