Is the noise constant or intermittent , and can you pin point where it is coming from ?
If you can't tell when you are on the road , put the bike on the center stand and have some one open the throttle up while you see if you can figure out where the noise is coming from .
Also you mentioned you didn't trust the dealer . I'm pretty sure there are records of work done on these in either the dealership where you bought it , or with Suzuki ? I would ask for those records and report back here with your findings .
What I am thinking and while it's only a possibility , the dealer might have stuck you with a troubled bike . While it's not common there have been bikes with the same mileage with early CVT failures .
Time is of the essence on this , so get it in to the dealer NOW ! Then keep the dated paper work , if you go after the dealer for knowingly selling you a LEMON , you'll need that dated complaint .
I hope that helps and it's exactly what I would do .
Good luck !.........TheReaper!