YAMAHA 2011 550 GRIZZLY WITH 16 HOURS ON IT -REAR PLASTIC BRAKE DUST SHIELD CAUGHT ON FIRE AFTER RIDING IT FOR APPROXIMATELY 15 MINUTES-SINCE DECEMBER 2011 THE SMELL OF BURNING PLASTIC COULD BE DETECTED AFTER RIDING THE GRIZZLY BUT I COULD NOT DETECT THE SOURCE-AFTER THE 15 MINUTE RIDE THE PLASTIC SHIELD CAUGHT ON FIRE AFTER THE VEHICLE WAS SHUT OFF FOR APPROXIMATELY 5-7 MINUTES. *TR