I will see if I can get a scanned picture, but my manual shows the measurement from the upper carb surface, not the gasket surface. The measurement is from the flat surface of the upper carb body to the bottom (or top, as you're upside-down) of the float. Also, inside the fuel inlet connection there is a fine screen mesh that can get clogged and/or rusted up if there was ever water in the tractor's fuel system--another thing to check.
If the carb is set excessively rich it is possible it is drinking gas faster than the fuel tank can supply it. Is the air filter connected? If it is clogged, the mix will be rich. But if it is removed, the engine will run lean (getting too much air). The air filter has no replaceable element: just a metal mesh and an "oil bath" in the bottom cup that keeps the mesh wet & sticky with oil. That oil needs to be checked and replaced very so often. The mesh itself can be rinsed clean with kerosene.
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Today's Featured Article - The Engine Rebuild Kit - by Curtis Von Fange. I always liked engine rebuild kits. They have all the replacement parts for overhauling an engine without going to the store to get gaskets, special measuring tools, or miscellaneous parts. They come neatly packaged, clean and tidy. But it's important not to let that packaging lull you into a false sense of security. The appearance of matching sleeves, pistons, rings, and bearings can cause frustration and agony if not properly measured and installed in a workshop environment. Following c
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