You could always add louvers to the cowl;)
http://i127.photobucket.com/albums/p133/MODVP22/25XD.jpg here
See full version: Mercury 9.9 2 stroke clean exhaust
You could always add louvers to the cowl;)
http://i127.photobucket.com/albums/p133/MODVP22/25XD.jpg here
That was done by Tony Brucato (Brucato SVS) and article was by John Tiger, BASS & WALLEYE MAGAZINE both S&F members.
Are you sure the reed plate isn't different also? [links]
Also remember that the carb/exhaust tube swap will only work with 1994 and later 9.9 Mercs. The 1993 and older 9.9s were 12.8 cu. in. and after that they became identical to the 15, which is 16 cu. in. So, the 1994 and later 9.9 is basically a detuned 15 and not a boosted 9.9. That's why it's easy to convert them to a full 15. Also note that the 1994 and later 9.9s were putting out more than their rated horsepower - and the same applies to the OMC 9.9 as well. :)
You can convert it to a 15 by swapping the carb and adding the exhaust tube from the 15. Everything else is the same :)
Re: Oily sludge from exhaust 9.9 Evinrude REVISITED with PHOTOS
I always take a nice joyride around the lake after I've been trolling, keeping to the normal circulation pattern and away from fishermen.<br /><br />That way, even if I didn't do so well with the fish, I can enjoy my ride and blow the crud out of the engine.
What I tend to do if I think of it is run the motor at WOT or at least at a midrange rpm cruise for a minute or so after trolling, before shutting down - if this is at all practical. In my mind I'm burning out the sludge. Don't know if it's really the case. Sometimes, once you shut down, it is difficult to start it up -thus the reason to burn it out before shutting down.
Rod, You're looking at the results of a lot of slow trolling. It's a combination of exhaust by-products and unburned oil. If you go WOT for a bit, the exhaust will expel the accumulation.
You may also want to gap your plugs at about .040 if you have them at .030. more
Might be you need to do a decarb on the motor carbon will form on the inside of your engine and should be decarbed about every 50 hrs if you are not running a decarb product thru your gas. Do a search on decarbing engines at this site and you will get some helpful information. good luck
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Running some Seafoam thru it once in a while might help.
So the first kicker motor I had a couple years ago go all jacked up due to carbon build up. After speaking with the guys at a shop about it I was told it was due to the fact that the motor was always running at really low speeds/rpms which causes such build up.
Re: How to avoid carbon buildup in an outboard? here