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  1. S

    2014 40HP 4 Stroke Lower Unit Knocking

    My 40HP Mercury 4 stroke is knocking in the lower unit at idle when in Forward Gear. If I lift the LU out of the water the rpms increase and it runs like it should and you do not hear the knock. When I lower the LU back into the water, as it is being lowered the rpms decrease and the motor...
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