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B50 Engine Numbers |
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| BSA used a new coding system for frames and engines from 1969
until the end in 1973
This consisted of three parts:
Both engine and frame received the same markings. The engines was built, given a number and then stored ready for the frame. This would be the B50SSHE part of the serial code denoting a B50SS engine for July 1971. When the frame was manufactured it would be given a unique number in that 'manufacturing year' range ie: 15222. The Engine and Frame numbers were matching so these two, Code/Number, would be brought together at assembly and the finished serial number completed. The BSA 'manufacturing year' ran from August to July. At BSA the model year started after the factory shutdown in July so that 1971 models were those made between August 1970 through to July 1971. The date letters are as follows :-
The numbering started at the beginning of each season and always started at 00100 leaving the first 99 for experimental use. The numbers were consecutively allocated throughout a model range so the B25 & B50 are intermingled. Gold Star 250 B25SS 1971 Note: The lettering system should just be taken as a rough guide.
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See also 1971 B25 B50 Catalogue
Source: Adapted from a page at the Cedric Norman Archive
