RE: Check Your Bearings.
A minor note on checking the existing bearings for smootheness. Pull gently on the propshaft while turning it. Many engines will allow the crank pin to rub the backplate if you're pushing the crank back towards the engine, creating a gritty feel. But if you pull gently, it may just be smooth as glass. My OS46AX is this way, as is my old O&R .33.
J