I've got many thousands of hours in "light general aviation airplanes". I even owned a Beech Sport for many years while building time for my future airline career. I never had a smidgen bit of problems with any carburetor. As for the comment about the cabin heater system; Yes, there could be a problem with exhaust gas leakage into the cabin but that is why I had a simple detector inside the cabin on my Beech Sport.