The engine you just posted is exactly the one I would avoid for your bike ,it's a three speed full auto ( at least they usually are ) and a complete dog in a two wheeler .It would be slower than a z50 .Those engines are really wide so might be hard to mount
I just told my son today we should build up a few of the trail 90's I own ,he goes fishing everyday with his friends ,he doesn't really like the step through design ,but I think it will win him over if we set them up well .One even came with a spare set of rims with snow chains on the tires .
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