Under suspicion that my bike was running rich on everything but WOT, I took the slow jet down from a 68 to a 65 and the screw from 2.5 out to 2. I kept the main at 158. I did a long 5th gear WOT pull to test it out and it seemed a little cleaner in the bottom/mid and seemed to fall flat on top(like usual). "Better," I thought until I saw this: Its never gotten that hot before under similar conditions(long pull, cool outside). Could the jetting change and cold air have leaned it out enough to do that? I mean the plastic liquefied and started to run.