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Bsa dating

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On most BSA's the frame number is located in the following places. It is always Bsa dating raised numbers are casting part numbers. Up until it is rare for the engine and frame number to be identical and where the frame is shared by several models the codes start with the smallest model e.

This varies from model to model but usually it is on the front top frame member Bsa dating by the front seat stay or by the steering head. On the front down tube below or in front of the petrol tank. The exception is the early Bantams where the frame number is between the front engine mounting plate.

BSA used a system of...

These are usually faint Bsa dating small. By the steering head reinforcing plate or front down tube. Some Bantams on the engine mounting plate, these sometimes break and re- welding obliterates the stamping. Front engine mounting lug but the engine and frame numbers are the same.

The oil in frame B- series are stamped on the prop stand Bsa dating. Engine numbers are easier to find usually by the crankcase mouth on the primary side. Exceptions are the Bantams which could be stamped on the front mounting point or just behind the crankcase mouth. This is just a guide and will fit most situations but frames were legitimately re- stamped by dealers if the original was damaged and a replacement fitted.

These could be stamped anywhere and often were not stamped at all!

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