My 05 yz250 is blowing transmission oil from the right side case into the chamber that contains the power valve linkage. The leak is between the actual cases and the right side case. This happens after the engine has been running for a few seconds and was not cured by replacing the right side case gasket. The crankcase vent seems to be patent when I blow through it with the oil filler plug removed. Has anyone seen this problem before? I will take pictures if needed but not till tomorrow after I ride because as of now the only fix has been to silicone the cover that protects the power valve linkage. Thank you. Brian.