<https://yamahaclub.com/forums/topic/50995-79-xs250/#comment-303490>
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"I guess he's referring to the magneto stator / rotor?\n \n\n\n\t\n \n\n\n\tif it is, then the internal thread, highlighted in red takes a magneto puller,\n \n\n\n\tthe shaft is tapered with a woodruff key to hold the rotor in place.\n \n\n\n\tone of these...\n \n\n\n\tyou put a spanner on the flats to screw it in to the rotor and a socket on the end and screw it in, which then pulls it off the taper. the indent in the shaft end takes the pointed end of the device.\n \n\n\n\t \n \n\n\n\t \n \n"
<https://yamahaclub.com/forums/topic/50995-79-xs250/#comment-303664>