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I have a 2005 90hp yamaha on a 17' xpress bass boat. i can only turn 5200 rpm when you get to 4800 rpm the boat starts bouncing.

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  • mitch May 11, 2010

    Have you tried trimming the motor out or in at 4800 rpm?


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Check the running height of the motor.The prop shaft should be about one inch below the straight line of the bottom of the running bottom of the boat.With a cleaver prop it may be lower.A chopper prop is the best and you can run every bit of that.2 inches if pitch is = to about 500 revs.Try a few props 1st before you pay the dollars for a new one.The bouncing is the wrong transom height and prop.You don,t need a cav plate if the boat is set up right.(a cav plate extension like a manta).Bad dealers may want to sell you these.A well set up boat doesn't.I've set up and run a lot of ski racing boats and all have never needed any "bolt on parts".Its mainly a motor height and prop selection thing.Hope this helps

Posted on May 05, 2010

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