Riding my new M9000 around the yard, this thing makes a HORRIBLE sound when letting off the gas, I assume it is the BOV, is it normal to sound that way? Sounds like a clutch grinding on something, it is so loud. Just want to make sure it is normal before riding it, the setup from the dealer was questionable based on the tightness of some of the bolts I have checked, and they are closed for the weekend.