I was cleaning my Dolmar PS-7910 and, when I pulled the plug to see how it was looking, I noticed what looks like some carbon build-up on one side of the ceramic part of the plug. I've put exactly 2 quarts of ethanol-free premix through this baby so far. Aside from being a little hard to start--which I understand is not unusual for Dolmars--the saw ran fine. Do any of you know if the plug's appearance is normal, or is it a sign that I need to do some adjusting? TIA...
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