Where do you find a 125cc 4cylinder like that? Pistons would be like the size of a quarter.
people do all sort of crazy shit like this. It's worth tripping around the internet sometime to look up a few of the unusual motors. There are even videos of running micro eight pound V8s that basement shop hermits have machined out of billet stock probably never even noticing that their wives packed up the kids and moved to arizona.
google 48 cylinder motorcycle. Unknown top speed.
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