Bignasty1

This unit was brought to me this way with a new carburetor on it and read valves it fires up cranks fine but it won't accelerate I push the button in on the override it backfired and blow the head or loose from the spring at the head I'm figuring it's a CDI issue or bad switch or something I just want to bypass it all together and see what happens anybody out there got a clue I'm being told that it will live after I eliminate a wire which wire is what I need to know