Apr 08, 2014 · So, you've got a vintage Triumph motorcycle but you aren't sure what year it is, or you want to identify a swap meet frame or engine along with other Triumph motorcycle parts and don't know how to look up or decode the serial or VIN numbers? If so, the information below will be a big help. Pre Unit 500-650 Twins. 650's with the duplex frame used a D prefix. 1950 From 100N 1951 101NA - 15808NA 1952 15809NA - 25000NA, followed by 25000 - 32302 1953 32303 - 44134 1954 44135 - 56699 1955 56700 - 70929 1956 70930 - 82799, followed by 0100 - 0944 1957 0945 - 011115 1958 011116 - 020075 1959 020076 - 029363 1960 029364 - 030424, followed by D101 - D7726 1961 .
Classic Motorcycle Numbers Motorcycle Serial Numbers & VIN Numbers Motorcycle Serial Number Locations These vary considerably from marque to marque Engine Numbers Check these locations: Below the barrel stamped into the crankcase. On the front of the engine stamped either side of the crankcase join. Below the clutch / transmission area. Year shown in engine number prefix with two figures. For example 40-5T-26445 is a 1940 Speed Twin. This practice followed religiously and some single prefixes may appear on postwar models.
TRIUMPH MOTORCYCLE VIN DECODING Triumph Twins 1950 - Mid 1969 Year Unit 350cc & 500cc Pre-Unit 500 & 650cc Engine & frame numbers on these models were all the same and were preceded by the model code. The `N` suffix was used in 1950 and `NA` for 1951 and 1952. The same serial numbers were used for both Bonnevilles & Tigers. A new coding system (numbers) was introduced using a two letter prefix for the month and model season year, followed by a number which began at 00100 for each model year and ran on irrespective of the model it was stamped on. The model season started in August.
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