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99 change prop help

eroc

New member
I have a 2001 yamaha 9.9 on my

I have a 2001 yamaha 9.9 on my 18' boat. I want to change the prop to get some more speed I currently only get 6mph out of her. Will this hurt my motor. Also if I can change it what can I go with to get the most speed a 10" w/7 pitch or a 9.25" w/9 pitch? I was also informed you can make a 9.9 into a 15 is this possible and how?
 
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