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How a plug looks is very subjective. A large part of what is happening in the cylinder is dependent on when and how you pull the plug. Experts reading plugs are looking for what is happening at a particular point of how the engine is running and what problem they are looking for. For instance, if your engine misfires at medium throttle, you would run the engine a medium throttle for say several miles then kill the engine while at medium throttle, pull to the side of the road and pull the plugs to get a "snap shot" of what is going on in the engine at that throttle setting. You could be miss firing because the mixture is rich and the plug will show sooting or you could be lean in which the plug will look light grey to white. You see the problem is that even if you go out and run at a setting, when you let off the throttle to idle the mixture will change and show the mixture setting at idle not medium throttle. But, looking at that plug I see some carbon buildup around the bottom of the threads but the central electrode insulator and the ground electrode looks a light tan which looks about right. Hope this helps
 
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