Reply To: 1975 Evinrude 15 hp

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June 7, 2022 at 12:35 pm #261117
David Stanton
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    To add to what has been said, if the spark plugs are gapped too far open, and/or the spark plug electrode tips have gotten rounded off from a lot of running,  the spark has to build to a higher voltage to jump the gap and if there is an easier path to take (like through an insulation crack) it will take it.

    Dave