Ok so I have had a 400 and 426 and naturally I moved into a 450. They are all awesome but got some questions about the 07 YZ450 and that the bike has if its lucky 10 hours on it. All stock and SUPER clean!!!!! 1. After reading they seem to run hot but I don’t remember any except this one loosing coolant out of the overflow. 2. So after riding about half a tank worth I noticed that it started to bog really bad, so I thought it was out of gas. I opened the tank and a huge hiss and a volcano of gas vapor poured out. I checked the vent tube and it is venting easily because I can blow though it and I can instantly hear the vapor venting as soon as I put it back on. Pretty sure that I shouldn’t have take the cap off after an hour or two ride or riding.