i have a 04 wr450f, and i love it. i have done all the free mods and this bike screams. my best upgrade was the autoclutch, with the rear brake mounted on the left handlebar!!!! my problem is, i have an oil leak somwhere up high, it is dripping down on the header, right where it is mounted to engine. i took the tank and radiator guards off and there was oil all over the back side of the front of the frame, header, right rad and all the hoses. i found the nut missing from the header and the alan set screw was loose. is there enough oil blowing out of the exhaust to create this much of a mess? i can't see where it would be coming from. any help would be much appreciated!!