I'm working on this bike for my buddy. Told me it wouldn't start. First thing I did was drain the old gas and put fresh in. That didn't help, so I opened up the carb. Sure enough, the pilot jet was plugged. Cleaned it and put it back together. To get it to sputter, I had to give it 6 pumps with the accelerator pump, then kick with the choke on! Finally got it to stay running messing with the throttle, but would die as soon I left it alone. Within 15 sec of running, I noticed it pushing oil out the crankcase breather and the hose missing. What would you try to diagnose next?