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  1. C

    25hp merc one cylinder intermittent spark

    Newbie here. I have a '97 25hp merc outboard. Bottom cylinder runs well, top has very intermittent spark. Here's what I know; 120psi compression on both cylinders, coil packs, spark plugs, spark plug leads, CDI box all good. Bad spark follows coil lead for top cylinder. Pulling top lead when...
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