I seem to be having the same issue, however it looks as if the leak is coming from a breather tube on the left side of the bike. The tube comes out of what appears to be the gear box and it runs up to the bottom of the airbox. I removed the hose and when I rev the engine it spews oil from the gearbox. I have yet to tear off the side panel there to see if it´s a bad seal or something, but any insight in to this would be greatly appreciated!