The Revmaster Revflow "carb" is not a carburetor, it's a Throttle Body Injection. A poor-mans fuel injection. No floats, no float bowl, no jets, etc. A good solid unit, little to go wrong. But it does have the idiosyncrasy you mention. Can't jam that throttle from idle; once flying, you can. Like any small passage for fuel, some cleaner now and then is helpful, especially if the fuel has been sitting for awhile.