if it were me I would diagnosing electrical stuff..
1. throw your buddy's coil and caps on your bike and see if that does the trick, if not try the coil, nice dice? try his stator. exhaust every electrical component with known working parts, THEN
2. buy a new cut harness from Kompulsive concepts and run a just kill switch tether. get rid of every electrical thing on there tors, lights, parking brake etc. (id do this anyways)