So... I just got finished with a top end on this bike (cylinder re-nic'd, new piston/rings, etc...) and have been riding the ice up here in Alaska. My bike has been un-corked and runs like a champ. The one problem I'm having though is consistent oil in the airbox, enough to leak out of the bottom of the access door. I know it's coming from the breather tubes, but I'm not 100% sure why I'm getting it. Riding the ice, the bike spends a lot of time at high RPM and lays over (dragging pegs occasionally) in the long sweeping corners. My most recent thought is that I screwed up the rings when I put the top end back together and I'm getting combustion gas pressurizing the case. When I put my finger over the breather at idle I can feel both positive and negative pressure on the breather though. My hope is that I have not been checking my oil level correctly and I just have a little excessive oil. I'm working on borrowing a leak down tester so we can check the rings, but I'm not sure what else it could be.