[mjhanna7]

I have purchased a used 18 foot pontoon boat, with a 50 hp, 2 cyl Evinrude outboard. At full throttle and in turns, the prop cavitates. I have also noticed that the motor has been lowered on the transom, from it's original position, which I suspect was done in an attempt to correct this problem. The plate above the prop on the motor, is now well below the bottom of the motor well, which creates a significant spray of water off of the shaft.

I suspect the motor should be raised back up, and a different size prop used. The current prop is a 12 1/2 X 13, with a part #386909. It was hard to get an accurate RPM reading at full throttle, as the prop would not hold.

Any suggestions would be appreciated! Thanks.... Mark

[Dhadley]

There are pontoon specific props which should help correct that problem. They'll be far superior to the aluminum prop you're running. I'll PM you for more details.