Ok Tommy, time to get this 4 year project completed, LOL 
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The swing arm will have to be re-designed for the gas engine and a cover to hide it. I want it to be street legal and the DMV laws, here are a few, Gas powered is called "Slow moving vehicle (SMV) all lights and equipment plus 25MPH tops (yeah right). If electric 25MPH no DMV rules or insurance, can call mobility scooter. BUT! I am also thinking hide the gas motor and electric motor on the front wheel.View attachment 126510