BSA Owners' Club Forum

The BSA Workshop => Twins => Topic started by: TTJOHN on 24 August, 2017, 11:43:39

Title: Bolt up gearbox
Post by: TTJOHN on 24 August, 2017, 11:43:39
I have a spare bolt up gearbox for my plunger Golden Flash, now, most gearboxes have stamped on them STD but the spare one I have is marked up XX any clues as to why this should be, or is there any signifigence in this?

TTJohn