lifan 140cc vs 70cc top end rebuild kit?

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RileyK

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howdy one and all, im about to start a rebuild of a z50r and im trying to decide which route to take with the engine. I like the idea of keeping as much honda stuff on the bike as possible but for a bit more i could get a whole 140cc lifan engine. Has any one gone down either path before, are the 70cc's painfully slow?
 
you can race the 50cc in a stock class, they aren't that slow
 
and assuming i couldn't help myself and had to fiddle where would either of those two options leave me in terms of what class i would be in?
 

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