I have an 03 Ninja 250 and I'm not getting any spark at all from either plug. Most likely cause seems to be a problem with the ignition coils. I was just wondering first off, is it possible for both coils to go bad at the same time? or does the other not work if one goes bad because the circuit is broken? And does anyone know how to test an ignition coil without using that special kawi tool mentioned in the service manual? Can I somehow just do it with a voltmeter?