Re: clutch shaft bearing "is it important ?"
Don't use one too small, that will play h ell with the other end of the release shaft that is inside the hollow shaft, the portion that connects to the flower nut on the clutch.
5/16" is a good size because it fits up in there with a teeny bit of clearance all around it.
"It's a chinagirl. It's a sometimes fun little engine that often will break your heart. It's disposable.
Does not come with a fortune cookie."