I have an 03 wr450 and posted a few days ago losing almost all of my oil on a small ride. took everyones advise and and changed oil, checked for metal filings in the screen and oil filter. found nothing. Getting the valves checked on Monday. went for a ride last night and the bike runs as strong as ever. What I did notice is that on the clutch side of the motor there is a rattle noise. I don't know if this is a clutch problem or an engine problem. The clutch hasn't been disengaging like it should when I come to a stop even before this oil problem happened. thanks for your help.