i recently purchased a 2006 18' Bentley Pontoon with a 50hp Mercury 4 stroke. It's starts and runs great but will not rev over 2500 rems. I have changed the fuel line, plugs, cleaned injectors, new fuel, checked coils. There are no critical or non critical beeps at start up. The prop is a 11 3/4 by 15. I believe WOT is 5500 but I've never had it close to that. It revs higher in reverse. its a 3 blade prop and one blade is bent. I don't know what my speed was, the speed was unhooked. I feel like that is way too much pitch for the motor. The boat revs fine out of gear and in gear with the prop off. Please help!!!!