Does your banshee ever run ?
Anyways. If you say it has comp and fuel then i would check/test out ALL the electrical. Coil, stator, flywheel, plugs, caps, wires, all connections, pickup coil connections+gap, go over the harness for a broken wire, check all the grounds, if you have a extra CDI or a buddy has a known one that works, try it.
Did it work before when it was together? What did you take it apart for and what was all done?
Did you drop or hit the flywheel AT ALL..even a lil bit?
Im sure you have a Clymers and the banshee electrical FAQ link, so go from there and check it all out with a cheap lil multimeter to start.