This manual covers the Triumph 350/500 series motorcycles produced in 1971, featuring the Unit Construction Engine. These iconic British parallel-twin motorcycles are known for their distinctive engine sound, agile handling, and classic styling, making them a popular choice for vintage enthusiasts and riders seeking a piece of motorcycle history. The 350cc models typically offered around 24-28 bhp, while the 500cc variants produced approximately 34-39 bhp, both utilizing a 4-speed gearbox and chain drive. Manufactured primarily in Meriden, England, these bikes represent a significant evolution in Triumph's parallel-twin design.

This comprehensive service and repair manual provides detailed information essential for the maintenance, troubleshooting, and restoration of your Triumph 350/500. It covers all major systems, including complete engine mechanicals, fuel and ignition systems, transmission and clutch, electrical circuits, brakes, and suspension. With step-by-step instructions for repairs, rebuilding procedures, and regular maintenance schedules, this manual is an indispensable resource for owners, mechanics, and technicians aiming to keep these classic machines in optimal condition.