Good Sparkplug

Salsa Valentina /
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I did a few plug chops with my puch and this is my plug chop that had no four stroking(the rest of the plugs seemed rich with any higher jet) Using a 15mm Bing Carb with 78 Jet in it, 70cc K-Star, Foam filter instead of those mesh ones and a tecno circuit. Anything above 78 seems to fourstroke and makes the plugs black and oily. My concern is that this plug looks to lean but just right to be at. I haven't really ridden the moped with the plug, only short rides.Oil gets on the threads and onto the heat sensor. It's odd, only half of the sparkplug has carbon as seen in the pics. What do you guys think? Should I mess with the needle setting and or atomizer? upjet?

photo-4.JPG
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