Does anyone know the size of the fill plugs and overflow plugs on the top of the engine for a 72 JackPiner black engine? They look like 1/2" NPT but I am guessing they are metric pipe thread (BSP). I getting ready to put the bottom end of my project bike back together and I have been replacing most of the visible hardware with polished stainless and would like to do the same for these plugs.
Thanks,
KD
Kevin J. Donovan
Foster, Rhode Island
...............24 X 1.5 MM straight thread.............
Thanks Merlin
Kevin J. Donovan
Foster, Rhode Island