This manual covers Triumph 350 models produced between 1963 and 1974. These motorcycles are characterized by their air-cooled, parallel-twin engines, typically around 350cc, and were a significant part of the British motorcycling scene during their production years. Known for their accessible performance and classic styling, these models competed with offerings from other prominent manufacturers of the era. This documentation provides insights into their engineering, focusing on the engine configurations, transmission systems, and chassis designs that defined Triumph motorcycles of this period.

The purpose of this factory service manual is to provide comprehensive guidance for the service and repair of Triumph 350 models. It details routine maintenance procedures, including oil changes, filter replacements, and fluid checks, as well as in-depth instructions for major repairs and overhauls of all significant vehicle systems. The manual includes information on engine and transmission servicing, chassis and suspension adjustments, electrical system diagnostics, and bodywork. Troubleshooting guidance and identification of special tools required for repairs are also covered, ensuring that owners, mechanics, and technicians have the necessary information to maintain these classic motorcycles effectively.