||05-24-2013 09:23 AM
Those carburetors usually do not give the user that much trouble. When the engine is running do you hear an intake leak? Sometimes if the engine is muffled enough and you can get your ear or a mechanics stethoscope close enough to the questionable area you can find out where exactly the leak is coming from. Those carbs did not have anything other than a round rubber seal, which for the most part works well. If you really have 0.020" of slop in the throttle shaft, it may be time to drill the hole a little larger, and place a brass sleeve in its place. Before doing ANY of that, I would suggest putting some 90 or 140 weight gear oil in a squirt can and with the engine running, I would douse the exposed end of the throttle shaft. The thick oil will seal if a leak is present, and the engine will run fine. If the presence of the oil changes nothing, I would say that the problem you are having is coming from an improperly set and bent float, a possibly bad float seat, and or what you may have overlooked, an intake valve which is out of adjustment?
Good luck, and let us know what happens,