Something has gone wrong on my 2009 YZ450. The power seems to be slipping when i get on the gas, the bike has a feeling like the back tire it spinning from 1/4 to 1/2 throttle, after a second it would feel like the power returned. My oil turned dark gray, a few small metal pieces in the oil. Engine has a burning smell while running and after running. I rebuilt my engine a few months ago and have 9 hours on it, I changed my oil at 1 hr, 5hr and 8hr and it was always a normal brown color. My question is what is causing this, Is it the clutch? When i am sitting in gear and pull in the clutch the bike doesn't creep forward. Clutch is original and I attached an image of it. Any ideas?