The second letter indicates the season year of manufacture as follows :. The first letter indicates the month of manufacture as follows:. The frame number is stamped on the left side of the frame, on the front engine mounting lug. The number is stamped onto the raised pad. Note: The engine number is located on the left side of the engine immediately below the cylinder barrel flange. Pre-war frames ( 1937 / 39 ) used the prefix TH for the 500cc models ( 5T & T90 ) and TF for the Tiger 100.Įngine numbers had a prefix indicating the model type along the lines above such as 3T, 5T, 6T, T100, T110, 3TA, 5TA etc. The model numbers were T or 5T for the Speed Twin, T100 for Tiger 100, 3T for 350 twin & TR5 for Trophy. The year and model were used as a prefix to the engine numberįrom 1937 to 1939 the final digit ( 7, 8 or 9 ) was used.įrom 1946 to 1949 the final two figures ( 46, 47, 48 or 49.) Further down we have a more comprehensive list. We have listed the more common engine numbers at the top of the page. The condition of the number may also give indication if it has been tampered with. This also ensures you get the correct parts if you are ordering by description alone.
This allows one to determine the year of the machine being serviced. Technical Support WHAT YEAR IS MY BIKE 09 SepĬhecking the engine and frame numbers should be the first step in taking on any bike project.
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