Reply To: 1956 Johnson 30hp Only 1 Cylinder Firing

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July 10, 2024 at 11:36 pm #289051
Dale
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    rhalbert10@outlook.com wrote:

    How do I do that?  Touch the sparkplug to the engine block while the engine is idling?

    If you have a test light you can pierce the spark plug hood with the pointed end of the test light while the motor is running.  That will kill that plug.  If that plug that you pierce make no difference in the way you motor is running you will know that plug is not doing it’s job.

    hope this helps.

    dale