So I almost got my 70cc Puch kit done, all im waiting for is studs. I want to putt a 21PHBG on it, and performance exhaust, but I aint gonna have the money for a couple weeks, Would it do any harm to run it with the 15 bing jetted out and stock exhaust unrestricted with the baffles drlled until I get the bigger carb and exhaust.