Well im sure this is a millionth time someone has asked but,,Why does my 450 run hot??I went riding today in 100deg weather at some sand dunes..Yes that is hard on a bike,but my buddies (11 kx450,10 yz250f) bikes both ran hotter but mine actuall boiled over?And on the way back it started spittin and sputtering pretty bad.Got it home and rode around yard and its fine??But still had boiling sound in radiator..Whats up with this??Weak water pump? Running lean??Or just a 450 that hates tight stuff?? Need help! Thanks..