B&S I think this is the question. And I say the factory OE unit is preety good, but the wheel itself is cast. (I believe so)
Theres is nothing to worry about when bolting on the flywheel to any crank. Just weather or not it is internal or extrnal balanced. The extrenal balanced unit comes off a 360 or the one year only 340 that is extrenally balanced.
The crank must have a poilt hole to accept the tranny snout. Use with bushing.