First the motor will heat up in a hurry with the fan shroud off. The cooling air is not being forced across the cylinders. As suggested, check valves on other cylinder also and then plugs. You did not say what the model number is. If valves and plugs do not fix it, here is a SWAG. Some briggs twins have diodes in the kill wires of the coils. Disconnect the kill wire ( usually black ) at both coils and where it plugs into the mower. Ohm the wires. If the diodes are good you will have continuity in one direction only. If diodes are bad you can buy a new harness. If diodes check good and there is a solenoid on the carb you can leave wires disconnected at coil and run engine to see if the problem is still there. The only draw back to this test is the engine will run for a few seconds after you turn it off. Also what did you set the air gap to on the coils when you swapped them. It is normally .010 to .012 thousands.
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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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