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Complete coverage for your vehicle

Written from hands-on experience gained from the complete strip-down and rebuild of a Triumph 350, Haynes can help you understand, care for and repair your Triumph 350. We do it ourselves to help you do-it-yourself, and whatever your mechanical ability, the practical step-by-step explanations, linked to over 900 photos, will help you get the job done right. Regular servicing and maintenance of your Triumph 350 can help maintain its resale value, save you money, and make it safer to ride.


The Triumph Twenty One (also known as the 3TA) is a standard motorcycle made by Triumph Engineering Co Ltd in Coventry. The Model Twenty One was the first of the Triumph unit construction twin cylinder motorcycles. Rebranded as the Triumph 3TA in 1959 it continued in production until 1966 when it was survived by the Triumph T90, its sports version. Our Triumph Twenty One manual will show you how to service and repair your vehicle with confidence.