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    Convert 99 yamaha four stroke 2004 to 15 hp

    "I have just purchased a 2004 "I have just purchased a 2004 yamaha 9.9 hp four stroke for my jon boat, it just isnt enough power to get it to plan completly i have heard it is possible to do the conversion with a carb change, reeds, and exhaust. Guess i just want to know if it is possible on a...
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