15hp to 20hp 4 stroke conversion

[DeadShot]

Got a 07 15hp 4 stroke that I am trying to get more hp out of if possible. Everything is identical between the 15 and 20hp motors. Is there some way to convert my 15 to a 20?

 

[TOHATSU GURU]

Re: 15hp to 20hp 4 stroke conversion

Change the carburetor.

 

[DeadShot]

Re: 15hp to 20hp 4 stroke conversion

Is that all there is to it? I heard that something with the computer or something had to be changed too