I have a 98 YZ 400 its the first bike I've ever owned, and I don't know anything about the stupid thing. Anyway i was riding last weekend and the coolant was boiling out of the overflow along with tons of steam. I wasnt riding the bike hard at all i was just crusing around in third gear. Anyone got a idea of what could be wrong? The only thing I could think of was that i was going too slow to get enough air though the radiator. Please help.:(