1976 9.9 Johnson

Quackattacker

Recruit
Joined
Apr 6, 2014
Messages
5
I have a 9.9 Johnson 1976 on a 12 ft fishing boat deep v. I just recently put a casting deck on the front of the boat and it planes out pretty well with just me in the boat. For these years of Johnson's I heard you could switch the 9.9 carb for a 15 hp carb of a similar year and it becomes a 15hp motor. Is this true? Would this help my boat plane out better with two people in the boat? Of would that be too powerful of a motor?
 

bonzoscott

Senior Chief Petty Officer
Joined
Jul 26, 2008
Messages
745
Re: 1976 9.9 Johnson

Shaft length match the transom height? 9.9 should do fine running well.
 

kbait

Commander
Joined
Nov 13, 2007
Messages
2,446
Re: 1976 9.9 Johnson

'74 - '76 9.9/15hp difference is carb throat size and main jet size only. Carb swap = 15hp.
 
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