1994 Evinrude 115, questions on De-carbing

Mscanon99

Petty Officer 2nd Class
Joined
Sep 10, 2007
Messages
122
Hi All,

I have been having some problems with my motor that I belive a de-carb would help or eliminate. My motor is maxing out at 5500-5600 RPM's where it used to hit 6000. Also, it has been stalling in nutural or when I hit it to pull a skier up.

Anyway, after reading posts here, I want to de-carb. I read the FAQ's section and came away with this:

Run engine at fast idle, with engine running and warm, slowly spray liberal amount into each carb. Its gonna smoke up the place. Spray for a couple minutes, now spray a larger amount into the carb(s) until engine chokes out and stops.Remove spark plugs and spray the decarb product liberally into each cylinder, install the spark plugs, let it soak for an hour or more. Start the engine and run at medium throttle, or if at the lake, run it at full throttle. It won't hurt to spray some more through the carbs. Run it for atleast 10 minutes to flush the crud out of your engine. Now remove and clean, or replace the spark plugs. It works well to do the spraying, the night before you go to the lake. This way you can let it soak overnight, and run at full throttle at the lake.Don't do this in front of the garage door or the house, unless you want it covered with greasy black crude

My question is more for clarification:

1. Is Sea foam is an addititive I put in my tank?
2. Is Deep Creek is a spay I use as described above and use directly on the carbs?
3. What does "cleaning the spark plugs" mean, just wiping them down, or putting sandpaper to them?

For a point of reference, the motor is fine, I it was a sleeper when I purchased it and had it checked over. The compression is great at 145-150 per cylnder and I had it linked/synced, new plugs, new fuel pump put in when purchased. I have since put about 20 hours on the motor over the past 4-5 weeks.

Thanks for any advice.

Best,

MS
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: 1994 Evinrude 115, questions on De-carbing

seafoam and deep creep are the same product, deep creep is just in areosol can. seafoam is the additive for the fuel tank. i prefer this method,

Decarb, take a can of seafoam put 3/4 of it in the gas tank, with only 1 gallon of premixed gas. put the rest in a spray bottle. start the engine, and let it come up to temperature. then remove plugs, and them some real good shot of seafoam into the cylinders, replace plugs, let sit 15 minutes. restart, and spray the rest of the seafoam into the carbs, so the the motor almost stalls, wait and repeat until the seafoam is gone.then take for a wide open spin. then put in new plugs, ad premixed gas to the tank, and take it for a wide open throttle spin. it is going to smoke like a house on fire, during this process.

afterwards compression.recheck


you also may have a dirty low speed jet in the carb, causing your stalling, fuel starvation at idle.
 

Mscanon99

Petty Officer 2nd Class
Joined
Sep 10, 2007
Messages
122
Re: 1994 Evinrude 115, questions on De-carbing

Thanks Tdaddy,

Quick question: Are you saying to put the Sea Foam in my built in gas tank, which at this point is 3/4 full with about 15 gallons, or set up a separate tank/hose/bulb for this operation?

Also, will this process clean the low speed jet?

And lastly, since your telling me to run the boat at WOT and so forth, should I do this the night before I tow it up to the lake for an outing, otherwise, I need to do this on Muffs and will not be able to run WOT. If I do it this way and dont run the motor at WOT, should I not bother till I can take it to the lake?

Best,

MS
 

crb478

Lieutenant Junior Grade
Joined
Dec 6, 2006
Messages
1,036
Re: 1994 Evinrude 115, questions on De-carbing

Thanks Tdaddy,

Quick question: Are you saying to put the Sea Foam in my built in gas tank, which at this point is 3/4 full with about 15 gallons, or set up a separate tank/hose/bulb for this operation?

Also, will this process clean the low speed jet?

And lastly, since your telling me to run the boat at WOT and so forth, should I do this the night before I tow it up to the lake for an outing, otherwise, I need to do this on Muffs and will not be able to run WOT. If I do it this way and dont run the motor at WOT, should I not bother till I can take it to the lake?

Best,



MS

Put a gallon of gas in a separate container with 3/4 of the seafoam, you can use the same hose/bulb. Put the other 1/4 in a spray bottle. It will not clean your slow speed jet if it is clogged, but will help keep the carb clean if it is now clean.
It would be best to do it on the lake, the high speed runs help burn up and send the built up carbon out with the exhaust. It also helps spred out the smoke build up since the boat will be moving. If you do it on the muffs keep the boat away from anything you do not want smoked out.
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: 1994 Evinrude 115, questions on De-carbing

or crud splattered on. i use a portable tank. as said the only way to clean a 2 stroke carb is dismantling, soaking, blow out, and a rebuild kit. but using seafoam as a fuel additive, will keep clean carb clean.
 
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