This manual covers the Triumph T100, T90, 5TA, and 3TA models produced between 1963 and 1974. These iconic British motorcycles, powered by air-cooled parallel-twin engines, are celebrated for their classic styling and performance. The T100 typically features a 350cc engine, while the T90 and 5TA/3TA models utilize 250cc or 3TA variants, offering a range of performance for riders. Known for their robust engineering and the distinctive sound of their parallel-twin configuration, these Triumphs represent a significant era in motorcycle history, transitioning towards unit construction for many models.

This comprehensive workshop repair service manual provides detailed guidance for the maintenance, service, and repair of your Triumph motorcycle. It covers essential systems including the engine, transmission, chassis, brakes, and electrical components, offering step-by-step instructions for everything from routine servicing and troubleshooting to complete engine and gearbox rebuilds. Technical specifications, wiring diagrams, and specific procedures for components like Amal carburetors and Lucas ignition systems are included, making this manual an indispensable resource for owners, mechanics, and restorers aiming to preserve the functionality and originality of these classic machines.