alrite i have a 2005 honda 450r and about a month ago i blew it up and when i did oil was in the airbox and i put almost everything new in like new crank and crank shaft and stage two cam and big bore kit and new valve seals and well it starts pretty easy now but after five mins of running oil starts pumping into the airbox from the valve cover breather hose and my guess i didnt fix the original problem cause its doing what it did at the beginning and i dont know anymore and was wondering if anyone out there can help or got any ideas?????