When I take the oil filler cap off after running the bike it is pressurized--high pressure air escapes around the oil filler o-ring seal as you unscrew the cap. Seems like the hot tank is not vented. So I disconected the frame oil tank vent hose from the top of the engine and with the oil filler cap remove blew into the vent hose--its bolcked solid????? So my oil tank is not venting into the top of the engine and eventually to the atomspher through the larger crankcase vent line also exiting the top of the engine??? ANYBODY ELSE NOTICE THIS??? Could one of you forum users test your WR and see if your vent tube coming from the left top of the oil tank to the top of the engine is also clogged?? Just remove the oil filler then disconnect the oil tank vent line from the top of the engine and lighly blow into it it should be free flowing. I'v had plenty of four strokes with frame oil tanks and none of them were ever presserized?? So whats going on here maybe and over zellious frame welder in Japan?? No this is not a joke!! Thanks Clark I'm going to try to blow shop air into the vent tube from the frame and see if I can clear it.