My '71 CT70 has no spark at the plug but it sparks(arcing) at the points occasionally. I know that is a sign of a bad codensor so to eliminate the possibility of bad points,condensor,magneto coil etc. I swapped the complete stator assembly from a running bike. Still has same symptoms.

I hooked up wire tester to a couple of the wires coming out of the plastic plug from stator and when I kick engine over the tester lights up. Could it be a poorly grounded ignition coil? If so why am I still getting the arcing at the points? Do you have to pull the engine out just to remove ignition coil? What else could it possibly be? Thanks for any help!!!