Well I put it all back together and still the same problem despite the head now being torqued correctly.

The mower starts easily on choke at full speed it only blows a little smoke but still way to much for my liking and when you back it off to idle its smokes like crazy.

I swapped the exhausts and the same problem was still evident.

The PCV breather is fairly clear and doesn't appear to be at fault like before it was cleaned.

I am still leaning towards oil getting into the combustion chamber somehow but I am a little unsure.

Also I know the chonda copy carb I got is correct as I have used them on copy GXV120 engines before and they have not caused an issues.

If the rings were damaged I wouldn't get decent compression.

Any chance a new head gasket could fix the issue?

Still thinking and would appreciate any thoughts!