Author Topic: BSA Plunger gearbox markings  (Read 878 times)

Offline jfligg

  • Valued Contributor
  • ****
  • Join Date: Aug 2006
  • Posts: 267
  • Karma: 1
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

Online BSA_54A10

  • Wise & Enlightened
  • *
  • Join Date: May 2008
  • Posts: 2055
  • Karma: 32
    • BSA National
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.
Bike Beesa
Trevor