2007 Mercury 4 Stroke 115 Dropped from 6000 rpm to 5000

by Brandon
(Mississippi)

While driving my 24ft Bentley pontoon boat, all of a sudden my max rpm and max speed dropped. I was getting around 6200 Rpm at 27 mph. Now it won't get over 5000 rpm at 21 mph. Any Idea what the issue might be? Engine runs perfect other than the loss of Rpm and speed.

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