I'm not sure I'm ready to jump on the bandwagon of hating on the racing association. Not hating on ya, and cool you aren't wanting to cheat etc. but, most of us have been fighting to have the 250 2 stroke allowed in the 250 class. So my guess is, the 450 class is an open class, OEM 251cc and up? meaning 300XC, CR500AF etc would be allowed in that class? So, my point is, that I understand your frustration, but we have been trying to get those rules in place, and now everyone is ready to pounce on the association for going basically to how we want those rules. Again my point about racing the 250 class, and I understand your wanting to race safely, is that the racing association is allowing the 250 vs 250 rules. Please don't mess that up and get the 250 vs 450 rule put in their books. It will be a step back in my opinion. Yes, we'd like to see overbores allowed in your association, but sometimes when you push something, it will backfire for many others. JMHO. One other note. When you signed up, did you list it as a YZ300 or just a YZ250? If you got stickers made and listed it as a YZ300, you may not have any more issues.