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spark plug color?

Mack

Senior Member
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I pulled my plugs yesterday after a short run, brought the temp up to normal, ran it at 50-55mph and killed the ignition. I looked at the plugs and the #1 and #4 cylinder plugs were that nice brown color we are all looking for. The #2 and #3 cylinder plugs had some black powder carbon on them. Is this typical? I'm thinking maybe the valves on these two, 2 and 3 cylinders need adjusting. I'm not sure but I would think if it was the carb or the ignition system all of the plugs would look the same? Maybe I don't have a clue what I'm talking about?? Any input would be great. Thanks, Mack /ubbthreads/images/graemlins/cheers.gif
 
I'd put 1&4 in 3&4 and vice versa....Then recheck.
If the clean ones soot up & the other 2 clean up, you eliminate plugs as your trouble.

What heat range & type are you using?
 
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