[lincpimp]

You could try one of mike's bore adapters to up the novak shaft size to 5mm. Problem is that alot of people say that the novak shafts break easily and the weight of the clutchbell and flywheel will only make that worse. Best to stick to a motor with a 5mm shaft. Not sure why novak don't make a replacement rotor and bearings that have a 5mm shaft.