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Author Topic: BSA Plunger gearbox markings  (Read 1133 times)

Offline jfligg

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BSA Plunger gearbox markings
« on: 18.08. 2012 21:58 »
Hi guys
I was wondering if anyone knows what the markings on a BSA Plunger gearbox inner cover.  I have seen S,R,X,XX.  Ihave one marked MD but I think they are PO initials.  Can anyone shed some light on the subject?  Jeff
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Offline BSA_54A10

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Re: BSA Plunger gearbox markings
« Reply #1 on: 19.08. 2012 11:17 »
The factory used go / no go gauges to maintain build tolerances.
Typically you would stamp the part with the number of the last gauge that fitted.
You will see a lot of funny stampings if you look closely at your bike.
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