Old school minibikes is a website that will have info on lawn mower engine powered bikes ,personally I would put a honda pitbike type engine in it and be done with it .About how wide would you like the rear tire to be ?I might have a wheel from something like a super pocket bike that might fit the bill ,and I have the matching front wheel as well if I have the rear ,I usually strip those bikes for the racing engines and pile them in the back for scrap .
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