You gotta remember this engine started as a 50cc, Honda took it as far as 90cc, and I have seen them out to around 150cc (170cc with a different cylinder/head, Kawasaki I think). The bigger you get this engine the less time between rebuilds. I *think* without getting past reliable maybe 125cc. If money is no object, personally I would start with an OEM Honda (not because the Chinese copies are no good, but they are not as good, as OEM) then I would google "Takegawa", and run myself out of money.
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