View Full Version : Why are my plugs black?

12-12-2004, 07:30 AM
I pulled my plugs to fog the engine. They are totally covered in carbon. I know this means something - like mixture is too rich or timing is off or something. Can anyone tell me what needs to be corrected?

12-12-2004, 08:16 AM
This may help (http://www.eric-gorr.com/techarticles/sparkplugs.html) or try This site (http://members.uia.net/pkelley2/sparkplugreading.html) :wavey:

12-12-2004, 09:02 AM
Which motor do you have and what year is it? What is the service history? What does your temperature gauge read under normal conditions? Has the thermostat been removed? Is it really cold where you are? Which plugs are they? When was the most recent tune up? You didn't say when or if the performance is suffering, either.

Go to the second linkMag posted- I think it's more valid since you didn't say they were gummed up. If the motor has a carb and the plugs are sooty, look for the heat ring on the base. If that's sooty, too, it's probably too rich.

Clean your flame arrestor.

12-13-2004, 06:37 AM
Cool! thanks for the links with pic's....