I got a 48cc/50 I installed got to start. So the next day it wouldn’t start got tired of peddling so put a pull start on . Finally started but had to shut it down pull start broke was making noise . It was kind a no power boggy . So I took a white paper towel and found oil between head so ordered a new head gasket and pull start got them installed . When installing I found a little puddle of gas on piston so it’s getting gas. I check spark got it. Just won’t start any ideas? It’s a hp carb too