Hello Everyone, I'm new to Thumper Talk. Wish I had known about this site earlier. I have a problem with my 00' YZ426F. I was riding up in the mountains and noticed motor oil mixed with coolant coming from what I guess is the coolant vent hose. The bike continued to run until I got back to the truck, however it wont stay started now and just runs crappy. I've heard of a few things it could be...anyone have any ideas?