When is the decarb process complete?

[Phil Miller]

I just finished decarbing my 70, 60HP Evinrude with seafoam in 3/4 tank of gas but is still smokes. At some point in the process, should the smoke decrease or stop when the motor is fully clean, or does seafoam just smoke? I don't think this motor has ever been decarbed. I noticed a marked increase in rpms, and smoother operation about eight minutes into the process. Question: Should I buy another can of Seafoam and do it again until it stops smoking?<br />Lenny

 

[TwoBallScrewBall]

Re: When is the decarb process complete?

As long as you're running gas with seafoam in it, the engine will smoke more than usual. It should decrease as the carbon burns off, but the seafoam itself smokes when burned. <br /><br />hope this helps!

 

[Phil Miller]

Re: When is the decarb process complete?

So, no, don't do it again, right.<br />Lenny

 

[TwoBallScrewBall]

Re: When is the decarb process complete?

Well, I've read that sometimes you need a second dose. Pull a plug and look for carbon on it, and if you can, shine a flashlight in the plug hole and see if things still look black. If so, run another tank through.

 

[Phil Miller]

Re: When is the decarb process complete?

Thanks, Steve.<br />Lenny