this is with a 45 pilot, and 165 main, 40 leak, 65 starter, JD red #4.......untill i changed the pilot the plug was black all over."48pilot"...........went to 45,bone white 04 WR450 all the mods 300' 90-100 temp 65-80% avg. humidity air box open real good,clean filter, GYT-R full exhaust 1.25 turns pic looks very very lean...........changing nothing but the pilot made it go from black to this...also when i put the "brand new" plug in this morning i started it and let just idel 3-4 minutes killed it pulled the plug, just a little tan. put the same plug back in did not twist throttle over 1/4-1/3. pulled plug, just a little tan, very little...........put plug back in run her "WOT" and all through the throttle range, with a lot of decel popping. pulled plug white just like all the other checks but this time there was a BLACK ring around the bottom couple of threads"shown in pic.