At this point, what have you got to loose by removing and opening up the starter? The armature could be bad, but most often it’s a broken brush. If you have 12 volts at the starter when the button is pressed, you have an open circuit in the starter. Can’t argue the point of an external starter. You’ll never miss the start of a race with one. But having the on-board is nice if you ever spin.
LAD Specialties customer / tony kart / rotax / kt100