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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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