Here's what the reverse looks like on a Howhit just for reference (sorry about all the mud).Your missing the shaft bushing between the gear and gear box.I might be premature asking but it appears that where the engine sets the chain is going to hit the frame, also how are you mounting the engine? if it doesn't hang from the carriers bolt at the top then you won't have a way to adjust the chain.I believe you have to remove the pin at the bottom of the gearbox as I think that was pat of the wheel rotation stop assembly for the scooter.The output shaft on mine is about 4-1/4" long.
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