Outboard Carb Question (new to outboards)

[dingelbarries]

Ok stupid question time here. I have a 1978 115 Hp Johnson on my trimate. In this model and year the v-4s all had all the same part numbers for every component, except the carbs. Is it possible a set of 140Hp carbs can be put on my 115 motor to get 140 horse? Would anything else need to be changed (intake etc)? Does anyone know the part numbers for the 140 HP Johnson carbs? I realize if I wanted a bigger motor I should just put one on, but I am kinda attached to the lighter v4s. I know all the super speed freaks would just ditch a little 115 but hey I am getting 54.8 MPH (GPS) with a 21 pitch prop (RPM limited). I have a 24p raker and a 6 inch jack plate in the mail right now, according to what numbers everyone else has posted here I should get in the low 60s. I live in an area where a 45MPH speed limit is enforced on 3 of the 8 lakes close. Dont need 70+. Thanks in advance for anyones input.

 

[Vandalizer]

I don't have a clue about Johnsons, and I'm not much better with Mercs. But based on what you've said, you've checked it out, and everything but the carbs are the same between the 115 and 140- if that really is the case, you should be able to swap those two carbs and increase your power! Maybe just double check the bore/stroke of the 115 vs the 140- that could've been changed.