Hi, I like Matt's way.

Put rubber radiator or heater hose on the frame, tape around it and rubber mount the motor.

For the front mount cut a spacer and drill 4 holes in it. Two for the studs in the motor and two outside of those holes and put a U bolt around the frame.

Weld a piece of sheet metal shaped to meet the curve in the u bolt where it meets the rubber. Do the same for the spacer where it meets the rubber hose on the frame. Double nut everything.

I filed the back mount to allow rubber mounting in the back too.

Rubber mounted 2 stroke Moon Dog is smooth !