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    1974 mercury 850 85hp 2 carb 4cyl runs on 2 cyl

    "I have a 1974 850 mecury 85hp "I have a 1974 850 mecury 85hp 2 carbs 4 cyl eng. and it is only running on 2. Have good comp. 120 to 125 psi on all 4 cyl. have spark , have rebuilt carbs 3 times i thought i had bad plugs ,replaced them no change.eng seems to idle ok have had trouble...
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