what part of the plug do ya read?

[stupid driver]

what part of the plug do u read to tell if ur runnin lean or rich?

[flaneledholes]

Well, you look at the end where the spark comes out of... It will either be white brown or black... It is the part that goes into the motor first...

[timewass]

You want to look at the porcelin (I think that's how it's spelled) part near the electrode on the end.