Yamaha makes that prop in a 16 pitch, a great running little prop. A good prop man can stroke it a little and get it to 17+ pitch. I would not let anyone local touch it. better yet, you could order what you want from Ron Hill. He can build you a bi more diameter, let's you raise the engine height, and build anything from a round ear prop to a cleaver 4 blade. He is the best prop builder in the country and reasonable. Call and talk to Ron, a great guy, give him all the data on what you are doing, he can work you a rocket prop. Doesn't show much on his website, but, he is the man when it comes to performance propellers. Go to his forums and look at some of his work, beautiful stuff.
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http://www.boatracingfacts.com/forum...p?5-Propellers
http://www.hillmarine.net/
Danny