Hi Lawncutter , yes Norm is right if you have the gx120 engine already then buying the clutch with a 3/4 hole would be the easiest
solution , but if you first need to buy an engine get one with the 20mm 5/8 shaft like Loncin or Lifan or Honda etc.

Cheers
Max.

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Clutch.jpg (37.17 KB, 2 downloads)