Not sure, but it depends on what the noise is? I say as long as the transmission/bike runs ok then I wouldn't worry about it. Eventually you'll need to replace the clutch plates. I have ~15K on my 01 and no problems yet. Make sure you have oil level proper. Chain is usually the noisest thing I notice but you already ruled that out. My buddy thrashes his bike around so of course his makes more noises than mine.