Check for 12 volt input power to the coil. If power is going in & you have proper ground, all that the coil waits for as it builds up more power is the abuility to jump to ground into your spark plug. so if power & ground are supplied, than the problem is on the dump side, no availabuility to discharge into the plug.
Does that bike rely on a crank sensor or any other computer related part to tell it when to fire???