I bought this motor several years ago at a yardsale, thinking I'd eventually put it on a bike or go cart. I recently pulled it out of storage and found that it has a thread crankshaft instead of a keyed shaft. The engine has never been used or even so much as started. Wondering if I should sell it to someone in need of this type of motor, or should I swap the crankshaft. Or maybe even part it out? Any help would be appreciated.