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Message: [QUOTE="Moto Squid, post: 771856, member: 33284"] Background info is the bike is mostly stock except for a twin air filter, zip ty fuel screw and JD jetting kit. (red needle 4th clip, #172 Main, ~2 1/4 fuel screw on stock pilot) I'm in Wi and it's about 50 degrees right now. I've always had issues with an off idle bog and a hanging idle. It's irratic at times too. I've started with the FS at about 1 and turn it out at 1/4 incriments. 2.25 seems the best but it'll still fall on it's face sometimes. (same day, same conditions) :think: With plug checking on a thumper is it like a 2 stroke? The first pic is of my crf plug after a 4th gear run. Second one is of my old cr. The crf is more of that yellow color like the cr with ~2mm black ring. I'd really rather not hack these plugs much since they're kinda expensive. Oh and I'm using power110 race fuel right now. Thats why the plugs are more yellow...could this cause my jetting complaints too? [/QUOTE]