Cam chain buzzing noise

[unfazed]

Buzzing is usually caused by vibration between items, and would be a common sound from the Tensioner with a metal bar up against it, It would be extremely unusual to have an issue with the tensioner on a bike with very regular oil changes. Any issue with the Yamaha Tensioner I have come across are usually rust in the tensioner from lack of use and lack of oil changes. It could be as simple as a perished rubber allowing metal on metal or a loose dowel in a hole, the list is endless. Are all the tank mount intact and bolts tight. I came across some time ago where the owner of a Fireblade was being driven demented by a metallic buzzzing sound which was a a bolt dropped by a mechanic on to the exhaust which was jammed in between two downpipes