The bikes an 06 CRF450R. I'm not sure if this O-ring even belongs on my bike, but I have this feeling in the pit of my stomach that is does. I've spent a lot of time combing through the parts lists/diagrams and haven't found anything that resembles this o-ring. The following components were removed from my bike: Carburator Head Cylinder Stator Cover -Stator removed from cover -Fly wheel removed -Cam chain I know this might be a stretch, but I thought maybe someone would recognize this as a part that typically falls out when touching these components on the bike. The last thing I want is my motor to have problems after all the time/money I spent rebuilding the top end. Any help would be greatly appreciated.