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    convert 2004 yamaha four stroke 9.9 hp to 15hp?

    hey i have been trying to find out the FACTS about converting a 2004 yamaha 9.9 four stroke to a 15 hp. I have heard several things such as carb change, reeds, exhaust. If any outboard mechanics have info on this topic i would be greatly appreciate finding out if it is possible on a 2004 four...
  2. C

    convert 2004 9.9 hp yamaha four stroke to 15 hp

    hey i have been trying to find out the FACTS about converting a 2004 yamaha 9.9 four stroke to a 15 hp. I have heard several things such as carb change, reeds, exhaust. If any outboard mechanics have info on this topic i would be greatly appreciate finding out if it is possible on a 2004 four...
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