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  1. thank you, that might be it. What type of oils does the bike take.
  2. I Have A 2003 Wr450, And It Had Been Running Great Until A Buddy Changed The Oil. Im Not Sure If He Overfilled Or Underfilled It, Though I Have Since Put The Right Amount Of Oil In. But Now My Bike Whines When I Ride It Almost Like A Low Pitch Whistle, And When I Shut It Off It Sound Like A Valve Or Piston Slap. I Thought It Might Be Eiter The Timing Chain Being Too Tight Or It Might Need A Valve Adjustment. Any Suggestions?