how to convert 9.9 to 15 h.p.

[1966]

i have a 1999 johnson 9.9 i would like to convert to 15, wondering what it takes, anything more than changing carburetor?

 

[racerone]

--------------shop.evinrude.com-------------------All the parts breakdowns and part #'s for you to compare.--------------Take the time and see what you need to do.

 

[bobbyc]

There were differences between model years...at one point it was just the carburetor...then it got more complicated...click on the link and scroll down about ten pages for your answer:
http://www.sschapterpsa.com/ramblings/Johnson%209.9_15.htm