Hey guys, I have a strange jetting problem on my bike, maybe someone here can shed some light. I have done all the free mods, and boyseen fuel cover and storm fuel screw, jetting as per indys sticky thread and now a YZ muffler. While i drive my bike at higher speeds while cruising the streets she hickups every now and then while at light throttle, when i accelerate she seems fine. I tried to adjust the needle up and down a notch, same thing, she dont' backfire now when i let go of the gas as i turned out the fuel screw until it went away 2.5 turns, my next step was upping the pilot to a 50 and try that (on back order). But the biggest concern is last night i removed my sparkplug after going 80km on a road/trail averaging 100-110 km/h and when i check the plug the center electrode was nice and clean-tan looking. but the outter inside area of the plug was very black and sooty, what the hell could cause this? i have never seen this hapen before, it looks to me like my jetting is rich somewhere but where i drove last night was good enough just to keep the electrode clean, any ideas??