Not Ranked
Too many things come to mind, right off the bat....you don't give the came specs, but porting heads will cause you to lose the bottom end if you didn't need the porting. 650 carb way to small...you don't say what jets and power valve are in the carb..Xlr8or pretty much summed it up in one line.....get a new mechanic
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Jack
XSSIVE .....
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