I have a 2007 Heritage Classic and it makes a whining, hissing sort of winding sound coming from either under the tank toward the front, in the tank (if that is possible), or in the light area. I don't think it is electrical or clutch related, but more throttle related to a point. I can hear it at all speeds, even standing still when the motor is running. It does get somewhat louder as I increase the throttle, but the bike still runs fine. Any ideas what this is or is it just a normal bike sound?