I have yet to overheat my 2002 wr426. I live in Florida where it gets freakin HOT. Im talking hot molten magma hot and i have yet to overheat my wr. My buddie has a yz426 and he dosnt even have the overflow tank on his bike. It dosnt overheat either. So I snipped the overflow hose and routed it down with the other overflow hoses from the carb and removed the overflow tank all together. Has anyone else done this and are you sorry you did? Any feedback will be useful. I am trying to lower the center of gravity on this top-heavy musclebike. I also went to a Clarke YZ 3.2 gallon tank that hangs a little lower as well to lower thr C.O.G. I hope I dont screw things up!