I can't believe nobody has even mentioned combustion temp! U have a big ass engine burning 91 octane, making the combustion temp extremely hot, therfore making the entire bike hot! In my CR 125 I have 185 pounds of compression on a bike that comes stock w 115..we have to run 114 octane because it burns almost 100 degrees cooler. Were talkn about a dirtbike ppl, not a racebike. 8 degrees is great from WW, but internaly lowering the temp almost 80-100 is much better.