Convert 9.9 HP to 15 HP

[mrozborn]

I have a 1992 Johnson 9.9 HP. I have been told by several people that I can convert it to a 15 HP by simply changing the carb jets? Is this all there is to it, or do I need to change the entire carb. What about exhaust and plugs etc?

thanks

mike

 

[Barnacle_Bill]

Re: Convert 9.9 HP to 15 HP

If that motor is the same as a 94 it will cost around 800-900 dollars to convert it. In my opinion it ain't worth it. I forget what all had to be changed. Carbs, exhaust and maybe reeds.

 

[JB]

Re: Convert 9.9 HP to 15 HP

That "jets" myth has been around since the 50s, at least, Ozzie. All it would do is give you a very bad running gas hog of a 9.9.

It would be cheaper to swap the 9.9 for a 15, but even then you would be disappointed. It won't go 50% faster.

Good luck, and welcome to iboats.

 

[bgbass.1]

Re: Convert 9.9 HP to 15 HP

change intake and carb. and you have a 15 it cost me about 350 to go from 20 to 30

 

[dajohnson53]

Re: Convert 9.9 HP to 15 HP

Buy a 15 hp decal set and call it a 15.

 

[pgdignan]

Re: Convert 9.9 HP to 15 HP

dajohnson, I like the decal idea, would painting flames on the side make it go faster as well?!

 

[JUSTINTIME]

Re: Convert 9.9 HP to 15 HP

it could be carb or jets
sometimes intakes and exhaust also