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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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