Re: 4 stroking
Yes indeed. A fast idle is a symptom of an air (vacuum) leak. The most likely areas are the carburetor to the intake manifold and the intake manifold gasket to the cylinder. The kit gaskets aren't the best and I prefer to seal the carb to the intake and not rely on the metal to metal clamping action. Any good gasoline compatible sealer will work.
I'm not a fan of the 'O' rings because they rely on the carburetor staying tight against them to retain a good seal. If the carb loosens and slides away from the 'O' ring, you have a leak again.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"