I put a top end in (piston ,rings ,wrist pin clipsetc) The valve clearances were right within the spec in the manual. The hot start plunger was stuck in the Carb I had to break one of the little ears off to get it out, I bought a new one and a seal cleaned the bore out it slides in out nicely. I start it up for the first time since the rebuild second kick it is idling really high with the choke on let it warm up crack the throttle great response but as soon as you let off the throttle it bangs or snaps it won't idle or idles erratic Pull the hot start and nothing while it is running. When you used to pull the hot start the idle would pick up not any more !!!! Double checked the cam timing it is correct Three sizes richer on the main and the pilot nothing changed Any Ideas?