oil leak...i cant figure it out

[Bubba]

Recently my 300ex has been blowing oil out the vent tube. I was told the rings were probably wore out. So i replaced the rings, and i was riding around the yard and I looked down and saw oil coming out of that vent tube AGAIN. I dont know what to do anymore. Any help or suggestions would be great. Thanks. Bubba

[tigerdog]

does this bike have a vent tube to the intake? if so check it for a blockage all i can think of

[xc400ex]

Was the lower end of the motor tore down before it started blowing oil? Its common when putting the 2 main cases back together that the gasket slips out of place and blocks an oil passageway making pressure. If not you probably overfilled the motor with oil.

[dynofox]

My 400ex did that when I over filled it with oil. If you're riding slow and the motor is over heating oil could come out of the vent tube correct?