Just wandering if any of you Honda RFVC riders have ever experienced a noisy, resonating clatter/ knock at higher RPM's under load. It only does it under hard excelleration or highway speeds above 70. Valves are adjusted, octane doesn't affect it. The current bike in question is a NX650, 10K miles, but my XR650L developed the exact same problem at the same mileage. Both lived hard offroad lives. I've heard that the RFVC motors had a tendancy for cam chain/ tensioner issues. Has anyone delt with this before? Has anyone replaced a cam chain and/or tensioner before? Could it be another culprit?