Re: Re: Re: 9.9 hp motor to a 15 hp motor ???

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Posted by Jerry ( on September 19, 2005 at 15:02:10:

In Reply to: Re: Re: 9.9 hp motor to a 15 hp motor ??? posted by Chuck on August 30, 2005 at 00:00:37:

I am trying to convert a 1981 Johnson 9.9 hp to a 15 hp. I purchased the 15 hp carb and it did not make any difference in speed. I used a GPS to check the speed and both carbs produced the same speed of 17 mph. The 9.9 carb has a throat size of about .625 and the 15 hp has a throat size of around .865. I think that possibly the intake plate may need to be changed as well. If anyone knows where I can find any more info it would be appreciated.

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