Hi Guys, I am a nubie, the site is a great help. I have a 2008 450F with 300 miles only done the frame has lost a quarter of a inch due to the chain wear. Also when re jetting (taking the bike apart) i realised that the rear chassis was wearing thru also. The chain is tensioned right, the sproket is the correct way round, no play in bearings.. Has anyone else suffered or is mine the only one in the world as my dealer tells me? Thanks.