My brother's picked up a new '04 XR650R a few weeks ago and rode it last weekend. He was blipping around the campsite and never really got on it, never getting it out of 2nd gear for about 30 minutes. The coolant tank started bubling and coolant was pouring out of the right side of the bike. Then, it refused to start. Any hints? He was told that bike "can't" be ridden slow by the dealer. Thx!