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hey guys and girls got a question me and the old man bought a 2004 18 foot cuddy trophy has a merc 125 saltwater series on it..the question is we have taken her out twice since we got her in the water the motor purrs like a cat doesnt miss a beat ....but......when on land and running water thru her to let her run she sounds like she is running ruff....dont understand it ....maybye no backpressure on the muffler?/// im at a loss but please somebody put me at ease.....by the way i know i have to pick my day but how far out could we take that 18 footer???? we got the trophy because of the high sidewalls ......thanx guys...mike:p
 

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That motor runs on two cylinders at idle and four above, I think 2500 rpm. That may be your rough sound out of the water.
 
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