Re: 1938 Evinrude 3 hp weak spark on one cylinder

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August 31, 2017 at 10:48 pm #64109
Buccaneer
Participant

    US Member

    If that’s an opposed cylinder motor that both cylinders fire the same time,
    I can’t think of much wrong other than a bad coil. Might want to make sure
    the mag plate is snug and grounding well. Not sure how you were checking
    spark, but make sure you have two good spark plugs and that if your checking
    spark on one cylinder, that the other plug wire is grounded.

    Prepare to be boarded!