I just got the bike the summer past, it has about 35Km on it. At about 80kms hr if I back off on the trottle I can hear a noise come from the engine, it sounds like a worn tire, not a rattle, its hard to describe. I asked a few question and people said the cam chains and tensioners were bad in those engine, who knows.
I have the engine out to fix it, the chains don't look bad but I'm no bike mechanic, maybe I'll change tensioners and call it a day, what do you think.