Reply To: 1974 Evinruded 9.9 HP question

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July 12, 2021 at 9:49 am #242579
frankr
Participant

    This really doesn’t fit the symptoms, but have you heard that that model was notorious for fouling spark plugs? We couldn’t keep some of them running one weekend, brand new right out of the box. Worth a try anyway, try new plugs. Wait for someone to tell the latest plug type, which escapes me at the moment.