Re: 9.9 johnson to 15 hp conversion

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Posted by Spike ( on September 20, 2005 at 17:58:05:

In Reply to: 9.9 johnson to 15 hp conversion posted by jerry on September 20, 2005 at 12:07:51:

I sure can't help much with exact parts but I'm betting the reed valve assembly will probably need a change.There may be a restrictor in the exhaust,there may even be a porting change.
If you think about it an increase of 50% in power with only a carb change isn't likely to work.It would seem to me a 15 with a 9.9 cover would be an easier change.Of course we aren't the only ones that know that can be done.
I'm sure someone will be along with more info.
This has been covered many times here,you might try a search right here using the edit button at the top of your page.

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