1976 9.9 Evinrude

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Alumacraft

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Im looking at converting me 9.9 into a 15 hp. The only difference between the 9.9 and the 15 hp during 1974-1978 was the carburator.

I found a guy who has a frozen up 15 hp johnson from 1979, he's going to give me the whole motor for $50.

My question is does a 1979 15 hp carb fit on my 76' 9.9?
 
I believe there is a bit more to it, yes the bore and stroke are the same, but i have heard the timing, exhaust is different as well, as well as the rpm range they run to accomplish 15.
 
From 1974-1978 they are exactly the same!

Difference between the 9.9 & 15hp : When they designed this series of motors, they designed it as a 15 hp & then detuned it with a different carburetor for the 9.9. When the 9.9hp and 15hp came into being in 1974 and up thru 1978, the only real difference between the two motors was the carburetor. In 1979 they added a shim, part #325038, (one for each cylinder), behind the leaf valves & under the stop plate for the 15 hp, apparently to allow the motor to suck more fuel & air mixture in. Early 80's they changed the exaust, esc...

Here are Some Videos of the 9.9 with a 15 hp Carb.-

https://www.youtube.com/watch?v=GsoTBNCHQ4E
https://www.youtube.com/watch?v=TsL8FCrLHg0
 
For $50 that motor should have everything you need. You might even be able to get it running or at least see what's really wrong.
 
Im just going to take the carb off the $50 motor and throw it on my 9.9. the 15 hp motor is seized. pistons are rusty, hopefully the carb isnt to bad though. [-o<
 
Today I went to pick it up, and it was a 15 hp Chryster. NOT a 15 hp Johnson like he stated over the phone. WTF :evil: :evil: :---) :---) [-X
 
Just start looking at Ebay, they come up from time to time on there. Alumacraft hit the nail on the head with the history of the changes, well done! I believe the exhaust change was done in 1981. Starting that year a tuned megaphone was added to the 15 and the 9.9 still retained the standard old inner exhaust tube.
 
I found a couple on ebay.

here is a 1984 15 hp carb, with this work on my 76' 9.9? (Im sure any carb up from the early 90's will fit, right?)

https://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=200591539340#description
 
https://cgi.ebay.com/ebaymotors/Evinrude-Johnson-1974-1992-15hp-carbuerator-_W0QQcmdZViewItemQQhashZitem1c1a9fa8e5QQitemZ120705755365QQptZBoatQ5fPartsQ5fAccessoriesQ5fGear


https://cgi.ebay.com/ebaymotors/15-HP-Johnson-Evinrude-Carb-Cleaned-Ready-Run-_W0QQcmdZViewItemQQhashZitem415852a048QQitemZ280654684232QQptZBoatQ5fPartsQ5fAccessoriesQ5fGear
 
I got a 15 hp carb off ebay for $117.50. Carb is rebuild and cleaned. I just have to bolt it on and go... It should be at my house in 6-10 busness days. I'll let you guys know how it does on the water.
 
Im still waiting for my carb from ebay, but I was also looking at aluminum props for my 76' 9.9. Would it be okay to run a 9.25-11 prop? or would it be to much work for my motor. my current prop. is a 9.5-10. My boat is a 12 jon, pretty light.
 
I got the carb today :D :D . Just go done bolting it on. it started right up.. I'll be taking it to the river tonight. I'll post the improvement, later. :arrow:
 
Definatly way faster, I would highly recomend a 15 hp carb if you have a 1974-1978 9.9 johnson/evinrude :twisted: :twisted: :shock:

This is Alumacraft talking, Im on my bros acount...
 

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