I thought I had it set pretty rich. About 11,600 rpm on the top end. I did let it idle for about 30 seconds before I shut it off the last time though - but even the idle is set a tad rich about 2400. I don't know a ton about reading spark plugs other than black = rich, tan =good, white/melting = lean. Kind of confused as to why it's tan on one side and black on the other like that lol.I certainly wouldn't run that any leaner.
I figured it had something to do with that, I don't normally see that sort of variance in color on a 4 stroke plug. The next time I mill I'll shut it down as soon as I finish the last cut and give it another look.It's like that because of the combustion flame path in the cylinder. Nothing more and to me, your plug looks a bit on the rich side. Should be dark tan and the electrode lighter. Really, the only reliable way to ascertain actual plug color is to chop the saw immediately after running it and keep the throttle completely closed and then remove and inspect the plug color. Just idling down from running RPM will change the plug's color a lot.
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