Briggs 5hp w/ generator crank question.

#1
I have a 5hp Briggs engine and I removed the generator to find the crank doesn't have a keyway slot and the end of the crankshaft end is tapered about an inch from the end. Is there some way I can use a sprocket with a locking collar or something so I can use the engine in a mini bike or trike? :confused:
 
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