The ignition switch (original push in to stop, pull out to run mushroom headed switch) for a distributor/coil system gets its power from the amp meter. The power goes from there to the coil negative terminal (assuming original positive ground). If the switch is broken inside, or the wires are shorted at the back of the switch, the ignition may stay on all the time. Battery would run down, coil overheat, and it would continue to run.
If the ignition switch is working and wired correctly, and the engine chuggs and sputters when shut off, but continues to run, what is happening is called dieseling. It is caused by carbon hot spots in the combustion chambers, or incorrect/worn spark plugs with a high heat range, or an idle set way too high. The idle should be in the 500 RPM area such that it has little incentive to keep running when shut off. The throttle lever on many letter series tractors only works from 40% to full throttle. (Kinda normal) if the governor arm on the back of the governor is moving fully in both directions, it is as good as it gets. I would suspect idle speed first (only shut it off at idle and after maybe a minute of idling to allow temps to stabilize.)
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