Decarbing Gas Additive

[Oldsaltydog]

Right now I have good compression in my Force 90, so I am just considering the possibility of using a gas additive for preventing carbon build up. What specific brands would you recommend and where could I purchase them? (Of course, there are those who say that if you use good gas and good oil, you do not need any additives.) Please advise.

 

[roscoe]

Re: Decarbing Gas Additive

Use some SeaFoam, or the Mercury or OMC fuel treatment as a preventative measure.<br /><br />Decarb with SeaFoam DeepCreep spray to clean out the carbon buildup.<br /><br />See this link for info:<br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=36;t=000016

 

[JB]

Re: Decarbing Gas Additive

Moving to General Outboard.

 

[Oldsaltydog]

Re: Decarbing Gas Additive

Thanks, ROSCOE. You are being very helpful as usual.

 

[LubeDude]

Re: Decarbing Gas Additive

After the decarb, use a synthetic blend or full synthetic (My choice) outboard oil. Seeing as these engines tend to be carbon monsters, Id use the best oil I could afford. Use synthetic gear lube in the outdrive also.

 

[kd6nem]

Re: Decarbing Gas Additive

LubeDude and gang,<br />What is your feeling about using Sea Foam in the crankcase of a four stroke motor as well as the deep creep in the intake? Sea Foam's maker stands behind doing this, I am just concerned about loosening many years of scale and crud only to find it plugging up an oil passage or scoring a bearing before the filter removes it. If I remember correctly I have a bypass filter, not full flow. I could see doing this just before oil change as a preventive measure on a clean (recently overhauled) engine, just not sure about my 1970 vintage 4 stroke outboard.

 

[LubeDude]

Re: Decarbing Gas Additive

I dont think you are going to find someone here that is going so tell you to go ahead and do what you want to do and not worry about it, which is what I think you are hoping for. If I thought there was a problem with a lot of crud in the engine and I wanted to do something about it, I think I would go about it slowly. Id do the seafoam in the intake first, let it sit overnight, Start it on the muffs and smoke my neighbors out, then when it cleared up I would drain the oil while it was warm and install the seafoam and some cheap oil and start it up and run it for awhile to get the mixture moved around, do the intake again and wait till the next day and smoke them out again. After it cleared up and the engine was warm Id drain the oil and put more seafoam in and more cheap oil, run it untill warm and shut it down. Next day Id start it up till warm, drain the oil and fill it with whatever oil I was going to use. Id use Chevron 15W40 if it were me. Then I would take it out on the Lake or river and run the pejazins out of it and then bring it back and change the oil again. That should do it. You are right in being concerned about plugging things up, so do this at your our risk!

 

[kd6nem]

Re: Decarbing Gas Additive

Lubedude,<br />I've had this haunting feeling about doing it, yet I'd feel better if I knew the crankcase was clean. Couldn't hurt the rings, either. I've had advice to just go for it, but never had the guts- always a reservation in mind. No, I would never have poured it in and forgotten about it. I can't see any other way than a near immediate oil change after, I just didn't say that well. I'm still giving it thought. Thanks for your input. I envisioned something very much like what you said if I do this.<br />(Sorry to hijack the thread, guys- kind of related)