As far as I know it is 3/8 BSF at the diff end - and 3/8" UNF at the 'loose' end. Probably wise to fit a new one.
EDIT - note I had it wrong way round (brain fade) - now corrected.
Last edited by bmcecosse on Mon Feb 22, 2016 9:07 pm, edited 2 times in total.
The Minor (or Mosquito as it was to be known) was originally designed to be powered by a flat four so there is something rather 'full circle' about you bolting a Goldwing lump to that axle.
So it was!
I had forgotten that. I am a Minor fan, had 5 of them, that's why when I decided to make a trike I chose it.
Only problem may be putting too much power through it, the Minor was only about 40 brake, I think. The trike puts out 80