Reply To: 1958 envinrude 35 HP big twin running rough

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November 22, 2018 at 2:32 pm #154662
frankr
Participant

    J6 is the correct plug. IF, IF it is sucking water, my first go-to would be the exhaust cover plate on the side of the powerhead. They develop pin-holes through it. Carbon seals are sneaky, you usually don’t have any clue on those till it’s too late. You can access the cover by removing the lower cowling pans.