Any old-school riders out there? I have an 83 XR500R making some crazy top end noise. It sounds like it is coming from the top right side of the engine. Not knowing any better I would say it is a incorrectly adjusted valve, but I know better and the valves have been checked and are tight. My money is on the CAM chain, but thought I would check and see if anyone else has heard a similar noise in the past. Just powered up the XR650R. The thing is INSANE!