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    1989 40hp 4cyl wont loss of power

    I recently purchased a 13 ft Boston whaler with a 1989 Mercury 40 hp 4 cylinder 2 stroke. It starts right up and will rev in neutral, but when I go to get on a plane it bogs down and only makes it to about 15 knots (4100 rpm). I've cleaned the carbs, changed the spark plugs, checked the...
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