What do you mean by 'tapping'?
As far as I remember, the kill switch will connect the wire from the CDI to the ground. So, just pulling the connector should eliminate it from the probable causes. Check please before relying too much on this though.
To check the ignition, there's two basic ways:
1. exchanging parts with known good parts. Required: spare parts or another bike with helpful owner. If you have these at hand, go for it.
2. checking from downstream to upstream:
A - Spark at plug? Yes -> ok, no -> go to B
B - Remove plug cap, hold HT lead close to head, start. Spark? No -> go to C
C - Primary current going to coil: check that, when you kick, a voltmeter indicates a pulse to the coil. Connect meter to orange wire and earth.
D - Check for pulses from the two pickup coils (green - green/white and green - red/white wires.
E - check for pulses from the charging coil - brown/red wires
The above is not complete, but you should get the drift.
Two things to keep in mind:
1 - A lot of problems are caused by bad connectors or broken wires. Especially the last one is difficult to localise
2 - Although everything could check out fine, it might be coils or CDI is weak. Only way to find out is by method 1.