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SUBJECT: # 26400: carbon build up
Submitted by Leo Stringer (208.148.203.88) from MISSISSIPPI on 3/5/04 11:31:00 PM
My motor (225 Optimax)has been sitting up for about 4 months because of sickness in family. There is a procedure for getting carbon out that I have read about on this site. Maybe (fogging or something like that). If anyone knows this procedure and how to do it please let me know. Thanks again. Appreciate all the good information.
- 3/6/04 12:22:00 PM
Submitted by
JackR (207.218.236.242) from TEXAS says Decarboizing
Do a search for seafoam or decarbon on this board.In the mean time here is one post I copied a while back. Sorry I did not note who wrote it. I think it was Dunk. Maybe Sal. It was not me and I don't want to take credit for it. Whoever wrote it can come forward and collect the rewards.
This works for carbureted, EFI, Ficht, HPDI, Optimax and even 4 strokes... First you need a separate small fuel tank. One of those 3 gal red Tempos works great or an empty gal milk jug will also work, but might be a bit messier.
I use Seafoam over the OEM stuff like OMC Engine Tuner or Mercury Power Tune because in the last few years they changed the formula and you have to let them sit up 12 hours. Who's got time for that? Seafoam you can buy from NAPA, CarQuest or other auto stores. Seafoam works in 15 minutes.
You'll need 3/4 gal of gasoline and one 16oz can of Seafoam for each engine. Don't forget to add 3oz of oil if you are premixing in a carbureted engine. Use about 3 ft piece of fuel hose off the little tank. You connect this tank to your engine by pulling off the main tank fuel hose off the intake side of your water separating fuel filter and plug the hose off the small tank on to that fitting. Or you can separate the fuel line on the tank side primer ball, so you can still use your primer. If you have an engine that has fuel plug then you need a fuel plug on the little tanks hose.
Start the engine, let it warm up and start pulling the mix into the engine. You may have to increase the idle to keep it running once she gets loaded with the Seafoam. Run the engine 15 minutes in the dock or just cruising around under 2500. Then shut it down and let it sit for 15 minutes. Restart the engine, the smoke you see is the carbon burning off. Do the whole thing again and let her sit again for 15 minutes. If she smokes after the second time do it again, but I've never seen one still smoke after three doses. The gallon mix should be enough to do this 3 times. You don't need any wide open throttle; you don't need to change the plugs. If it's cleaning the combustion chambers it's also cleaning the plugs, but every 50-60hrs is good time to change plugs in most engines.
I cleaned an antique Evinrude one time that had a 1/4" of solid carbon on the exhaust chamber walls by running a 1/2 gal of the mix through it. Seafoam has been around since the 30's and it's what they used when they were burning straight 4 stroke 40SAE oils in outboards.
You guys with the 4 strokes think you are immune from this? Those engines work 10 times as hard as any auto engine ever will and they will carbon up. I bought a Bronco two years ago that had 95,000 miles on it. When I used Seafoam on it I had the neighbors hanging out of their front doors looking for where the fire was after I started it the first time there so much smoke.
Too many people are under the assumption that it's totally the 2 stroke oil that causes the carbon, wrong... it's also the additives they put in the fuels today. The carbon inhibitors in 2 stroke oil are there for this reason also. Remember when gasoline used to smell like gasoline, today it smells more like bad cologne.
For those guys that like to do the carbon treatment by spraying it down the carburetors Seafoam also comes in spray can called Deep Creep. It's the same stuff under pressure. It says right on the can that it is Oxygen Sensor Safe, for you Yamaha guys.
After that if your engine manufacturers recommends a daily additive treatment then do that in the mean time, but all 2 stroke outboard need de-carbonizing every 50-60hrs. If I owned a 4 stroke I would do it the same. Once you are set up with the tank and hose the Seafoam is only 5-6 bucks can. It is to easy not to do it.
- 3/7/04 9:28:00 AM
Submitted by
jack (66.90.173.250) from ALABAMA says Might cause damage
I wouldn't do it unless the manual calls for it, especially on the newer hi-tech motors, then follow the instructions in the manual. But it's your money.
- 3/7/04 5:44:00 PM
Submitted by
Reel-Rascals (24.147.144.237) from MASSACHUSETTS says Its IN the OEM manuals ...
... to do so. At least on every 2-stroke OEM service manual I've ever seen. I decarb every 50 hours on the OB and also use it on other combustions engines, like the car and weedwacker. They all runs like tops!
