THE BIG DOG ON THE ROAD 110 CU IN TWIN CAM FUEL INJECTED, five GALLON, LOW SEAT, BLACK FRAME & SWINGARM.BLACK FENDER SUPPORTS, BLACK HALF MOON FOOT BOARDS, STANDARD ABS. Fat, dark and strong, this down-and-dirty version of the custom icon is the big dog on the road. We went out to check the pulse of the street and then into the garage. The Fat Boy S rolled out. Raw custom attitude with the most powerful engine you can get in a cruiser this year.