if it gets no spark its as simple as a few things that could be wrong. first off, get a new plug, still no spark then see if your getting voltage to the external coil. if you get voltage to the coil and have a new plug with no spark still then you need a new external coil. if you have no voltage than you have a bad internal coil. hope that helps.
this is a little something I did with my banshee to elimminate a probe with electircal, swap out your buddys blasters electrical stuff one by one till ya get to the prob.