This is never a good ending to a ride... So i need some help to trouble shoot why the back half of my bike is covered in engine oil. As you can see my beemer is not exactly stock. There's no air box and the crank case breaths via a small K&N filter. Yesterday a mate borrowed the bike and called about 20 minutes later when he stopped and found oil all over the backend. It didn't take me long to find where the oil was coming from, yep, the crank case breather had excreted it. Thank god he stopped when he did because quite a lot of the oil ended up on the back wheel. Note to self: BUILD A CATCH CAN But why would this happen? How can i trouble shoot this? I've pulled the plugs thinking Rings but they look perfect. Any ideas?