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It sounds like your engine is "dieseling". It's where a gasoline engine runs after any normal source of ignition is removed. Dieseling is often caused by carbon build up in the cylinder (on the head). After the engine has been run, the carbon stays red hot and continues to ignite the fuel.

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Q: What makes an older Johnson 60HP motor keep on running after the ignition is off and the spark plug wires disconnecte It also revs up to more than normal RPM's?
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