I have watched youtube movies, read posts and it seems they do have a noisy motor but I'm sure it's worse since I've done the cam chain. I have a new chain in there, tensioner on four clicks and the valve clearances is on 0.05mm. I'm 90% sure the noise is made by either the cam chain or valves. Sounds like it's coming from the left side of the motor up top. Typical tappety sound. Would like to hear from other 610 owners, how is yours ?