3Dpsycho, if you are getting a spark, sometimes, it's possible, as TKG said, that you do not have enough speed on the hub to generate sufficient signal to fire the plugs off in a static situation. Take a drill and spin the motor over, no plugs in it, and watch for spark at the plugs, Theyshould spark. . period. If in doubt, try a freshly charged 5-cell pack of at least 1500 ma capacity. Also, check to make SURE you are getting ALL the voltage to the ignition, as degraded contacts on a switch or connector may be the problem. If it STILL does not spark after all that . . replace it. Simple as that.