I've got an '05 WR 450 and cant seem to get the clutch adjusted properly. The last few races I've done I barely have any clutch left at the end of the race. I rarely abuse the clutch and pretty much just use the motor to get me outta sticky situations. I had my bike on the stand and fired it up in neutral and noticed the back wheel spinning slowly....hmmmmm. So I decided to put it in first gear and when I pilled the clutch in the wheel kept spinning. I played with the clutch cable adjuster but it didn't seem to help. I replaced my clutch plates and springs and have about five hard rides on the bike since. Friends tell me I'm adjusting the clutch cable too tight, but if I leave much slop my clutch fades away quickly. Someone else told me using Mobil 1 will cause the clutch to work improperly. I swithed to BelRay Thumper oil but that didn't cure the problem. Anyone have any idea what's going on????