Seafoam..... How much is enough?

[insaynestanger]

I bought a fish/ski earlier this year with a '88 Johnson 150 GT. Although the engine ran great I could tell it needed a little TLC. So I decided to try "Sals" Seafoaming method and I could not believe the amount of carbon that came out of this engine. I honestly do not believe this engine has had any decarbing done to it ever. Of course just like I had read before doing this, the engine smoked like it was on fire while burning off the carbon. I have decarbed the engine twice already and It's still producing just as much carbon "goop" as it did the first time and of course it is still smoking like hell. My question however is, is it ok to keep seafoam treating the engine until there is no smoke and the carbon "goop" is not showing up? I would like to treat it again through a secondary gallon tank with seafoam in it but I wanted to make sure I'm not doing this too much. Also should I go ahead and change the spark plugs before another treatment since I will have to change them after the next treatment? Thanks!

 

[GA_Boater]

Who is Sal and how much are you using?

 

[HighTrim]

I cannot see how it would hurt anything. On a couple big hp motors, I did it 2 or 3 times. For the naysayers, this is not a witch's brew, or snake oil. It truly does work. I have increased compression readings by incredible results. For the heavy carboned motors, likely best to open up the plates and do some manual removal with something like a plastic scraper. I do a decarb annually. Could also add a bit to every tank. OMC Engine Tuner works well too.

 

[redneck joe]

i am a seafoam fan; works every time I needed it to. Only thing is, if i'm reading right - you still have new carbon build-up? I think there is another issue if coming back very quickly

 

[Cricket Too]

You could spray seafoam or anything else into a brand new engine and it will smoke like that and have goop coming out of the prop. Most of the smoke you're seeing is the seafoam itself burning, not carbon and the same with the goop, it's mostly the seafoam. I wouldn't do it more than 2 or 3 times, if you loosen up a good size chunk of carbon in there it'll cause issues. Run some Carbon Guard in your gas and decarb once or twice a year and you'll be ok.

 

[pn]

the seafoam smell whilst burning carbon is much sweeter and thicker than the airy white puffs of seafoam itself.