check and double check all connections, grounds, switches,dielectric grease ain't a bad idea.. Ohm coil and caps. Try new plugs, even if they are new.
Using proper puller, remove flywheel and clean poles on stator, clean inside of flywheel, clean timing nubs on outside of f-wheel, set pick-up gap.
Because the Banshee uses a wasted spark it's hard to tell if each plug is fireing on compression, as they also fire at BDC.
Is TORS brain and parking brake disabled?