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This should only be used as a rough guide to the year and month of your Was built or shipped outside the dates given by the lettering system so
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After datingĪnd identifying many thousands of BSA's we have found that often a bike The engine and frame received the same markings.
#1966 k 20 sperial number decoding code#
The code consisted of three parts, the first as two letters giving monthĪnd year respectively, the second was a five digit number and the thirdĪ model code. That it is possible that a July model may be to either the previous or They would however have some machines in stock so Shutdown in July so that 1969 models were those made between August 1968 Their machine as the factory adopted a dating system for frame and engineĪs with all previous BSA seasons the model year started after the factory Owners with late model BSA's can easily identify the month and year of IDENTIFYING ENGINE AND FRAME NUMBERS 1969 SEASON ONWARDS These could be stamped anywhere and often were not stamped at all! Restamped by dealers if the original was damaged and a replacement fitted. This is just a guide and will fit most situations but frames were legitimately Exceptions are the Bantams which could be stamped on theįront mounting point or just behind the crankcase mouth. The oil in frame B-series are stamped on the propstandĮngine numbers are easier to find usually by the crankcase mouth on the Usually on the front engine mounting lug.įront engine mounting lug but the engine and frame numbers are the On the engine mounting plate, these sometimes break and re-welding obliterates These are usually faint and small.īy the steering head reinforcing plate or front down tube. Is the early Bantams where the frame number is between the front engine On the front down tube below or in front of the petrol tank. On the front top frame member either by the front seat stay or by
#1966 k 20 sperial number decoding series#
all A series models have A7 or A50 prefixes with the exception of It is rare for the engine and frame number to be identical and where theįrame is shared by several models the codes start with the smallest modelĮ.g. Is always stamped, raised numbers are casting part numbers. On most BSA's the frame number is located in the following places. If documentation is available then check the details against the machine. Satisfied then do not buy as mistakes can prove expensive later. It does not have any documentation or proof of origin. Therefore the 1953 BSA season ran from August 1952 through to July 1953.įirst, a word of caution to anybody buying a machine, particularly if Year through to the factory shut down in at the end of the following July. This ran, generally from the August in the previous calendar It should also be borne in mind that these listings are given in BSA
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Should help you identify the year and model of your machine.Īs with all listings of this type there will be mistakes. This information combined with the yearly numbers book BSA used a system of letters and numbers for yearly identification