I have a 2004 R1 with about 16000 miles. I recently had it serviced and the repair guy told me that my cam chain seemes to be making more noise than it should. He said though that he never saw one go that early so it might be the tensioner. While reading up on the improvements on the 2006 R1 it says they redesigned the cam chain tensioner, which got me thinking there might be a problem with the old design. Anyone else out there have this problem? it sounds like a loud rattle or if your drive chain was really loose, that would be comparable. Anyway if it is the cam tensioner, wouldn't it be covered my yamaha's extended warranty? its not a standard wear and tear item like a clutch. Any thought??