If it was from an online seller, perhaps they have a picture on their site?
The prescribed test instrument is a peak voltage meter. If not available, then an analog multi-meter. If a digital multi-meter is used, then the pulsation may not be 'that' apparent and the voltage reading only relative.
A possibility to consider / rule out is that the wires for pickup coil and capacitor charging coil (power coil) may have been mixed up.
Another is grounded wire from either coil.
...hence a picture would help.
The previous issue was "...weak spark..."
Then when the "... plug,coil,switch,cdi, stator..." were replaced, the current condition is "...no blue spark..."
If the old "... plug,coil,switch,cdi..." were installed back and yet/still "...no blue spark...", then the stator would be the only suspect left.