I have a 94 parti Kraft 20 ft pontoon boat. It has a '77 70 HP johnson on it.<br />From what i have heard from others I need a prop in the 11 to 15 pitch range. It has a 14x17 on it now that came from the runabout that it was previosly on. I just bought a 14x13 prop from my dealer. He said that...