If hyoju have not cked the transom do so!! Do this with the motor up and then try lifting the motor up and down, should be solid with no movement or sounds Merc's start like crap but after that they are fine, CK the compression in all 6 cyl, they should all be with in 10% of each other.
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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