9.9 and 15hp differences.

[rupertmja]

My hobby is rebuilding stuff and I have been doing Evinrude/Johnson small outboards for about four years now. My question is this. Peope keep asking me if they can bolt a carb onto a 9.9 to make it a 15 and I keep telling them no as that is what I read somewhere. Anyway, what's the score? How similar / different are these two motors?

 

[Haffiman]

Re: 9.9 and 15hp differences.

I may depend a little of year, but in general carb, intake and exhaust. To be sure, compare parts of the model you are 'fixing' to get the exact difference in parts. Use the parts catalog on shop.evinrude.com or Marineengine.com.

 

[Rick.]

Re: 9.9 and 15hp differences.

There has been lots of discussion on this topic. Try doing a search and I'm sure you'll get lots of information. Best of luck. Rick.

 

[Jim311]

Re: 9.9 and 15hp differences.

It's nothing other than a carb swap on the newer models. The older ones require different exhaust "horn" as well.

 

[Haffiman]

Re: 9.9 and 15hp differences.

It's nothing other than a carb swap on the newer models. The older ones require different exhaust "horn" as well.

Not all of them, there are some 'years' with differences in the cylinder blocks. Check out the mod numbers and compare with parts catalogs as a rule.

 

[Newyota]

Re: 9.9 and 15hp differences.

What is considered "newer" years.

Not all of them, there are some 'years' with differences in the cylinder blocks. Check out the mod numbers and compare with parts catalogs as a rule.

 

[Haffiman]

Re: 9.9 and 15hp differences.

What is considered "newer" years.

The bigger cub. from 92(?) and up (starter on top).