Well here I am back again
I have been trial fitting an OS70 to my futura Nova and the manual suggest no shims but I can see this to be far to sloppy and the belt is all over the shop...
I have retried it with 1 mil shims behind the engine and it now twists still easily going just tight around the 45 deg point in both diretions. seems ok??
Just wondering for those of you with OS motors what you have done about the belt tension.
Looking the engine currently fitted I would say the top of the clutch bell and the metal gear behing are line with each other