If fuel is comming out the air intake and getting the air filter wet, then air must be going the wrong direction throught the carb. That might mean the intake valve is set too tight or carbon isn't letting it close completely. Check valve clearance.
This will cause the engine to run rich, black smoke, black carbon on spark plug.
Had this happen on two briggs engine back in the day of flat heads, intake valve seat recession. Had to grind the valve stem off to adjust valves then.
Seems with overhead valve engines, the exhaust valve clearance increases making them extremely hard to start because the exhaust valve doubles over as a decompression valve when starting.
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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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