Another option might be to reconsider what is being used as an engine mount. Many of them are fixed laterally, with the only adjustment being fore and aft along the frame rails.
The one we began with and still use is flat, and allows side-to side adjustment as well. That came in handy when getting the proper clearance. The frame we have was designed as primarily for outer right drive (such as the 2-cycles, KT-100, etc) where the rear sprocket is inside the RR wheel. Mouting the WF was not all that tough, though.
The Gold chassis does not have the 3rd bearing hanger. I thought only the frames built for higher power engines used those? That must be some beefy frame you have there. Are you sure it is for a kid? ;-)
