most likly it's your headlight, when you here a rattling sound when riding. remove the front panel where the headlight is and then remove the clip that holds the headlight on, cut a peice of rubber inner tube that fits the same size as the clip but longer, then find the best way to insert the rubber and the clip together to stop the rattle or vibration sound. I really can't explain how I did mine, and I am unable to remove the panel now to take pictures. but just try it.
If you think it's from another panel, just add a peice of rubber around the screw'sarea. ok?
ride safe guys