I have an 03 WR450 set up as a supermoto that sees pretty much only street use. With no thermostat, I imagine coolant temp varies a lot, which probably contributes to the difficulty I'm having in getting the jetting right. http://shop.watt-man.com/Thermo-Bob-3-for-WR450F-03-15-YZ450F-03-09-TBWR4.htm Has anyone added one of those to a road-going bike? I'm also planning on adding a fan, hopefully I can figure out a way to automatically turn it on when I hit 195 or something. Or if there are other thermostat suggestions I'd like to hear them.