With the Vulcan, that noise on the front of the engine often is caused by the bearings going on the tensioner pulley and it's an easy, inexpensive replacement.
The tentioner was actually the first thing I replaced myself. After spending about 3 hours on it, I cleaned and scrubbed every pulley and put a brand new belt on there. The noise stopped! Finds out that the stuff that's suppose help end the noise can actually cause it, and it didn't help that the guy from the used car lot was using electrical part cleaner on it before we bought it. After all that work the only sound is coming from the idler pulley. The barrings are the best but its something that can wait a couple paychecks