the flasher is stuck. the amp draw makes the flasher heat up fast, and then it opens, cools down and closes, again and again. either its just stuck or the heater is bad. some flashers use a motor, but not honda. its a little silver rectangle with 2 wires on it. under the seat by the battery, behind the left cover. any 2 wire flasher will work, as long as its a light or standard duty. do not buy a heavy duty or 4 way flasher.
turn them on, let them warm for a second or 3 and tap on it.