Hey Guys. I just got my vulcan 900 custom about a week ago. I logged about 200 miles, but I have noticed that while riding it, i hear a dull humming noise. It sounds like it is coming from the belt. I do not know if it is normal or not. The only time I do not hear it is when im on the highway and the wind blocks out the noise. Could anyone help me with this? Is this common?