Without a good woodruff key your wasting your time, there is a point on the mag that triggers the spark, exactly what isn't obvious but its in the construction of the rotor.
If your out by 2 or 3 mm you will get nothing as far as starting the engine. Don't worry about the cdi, its little more than a glorified cigarette lighter, really basic and pretty much nuclear bomb proof.
The DT generates its own spark energy, so, without a good kick you will get nothing from the ig. It has nothing to do with anything else either, not the battery, any voltage regulation its all in the mag coils.
Mag spins, generates electric, that makes the cdi generate the coil feed to kick the spark. Very basic, very reliable. I have been very grateful for its simplicity in the past when the only thing left working on a trail was the engine.