I just bought my bike on the 30th of May From a private seller. I took it into the shop to get the chain tighten. While waiting and filling out paper work the Mechanic ask me have I had the timing belt changed. The bike is a 2009 848 w/ 3500 Miles. I Bought at 2700 I been riding alot. I'm aware of the valve inspection/adjustment frequency of 7,500 miles. Some forums say 2 Years. But the guy says that I should change it every 3 years or i could have major damage. This is my first Ducati and I dont want to go wrong. Its a $450 repair. What should I do? Is this a way of getting misc. money out of me as I have little knowledge?