This is how i understand this stator and flywheel work. A/C is generated by the flywheel and stator windings and sent via the three yellow wires to the regulator/rectifier. This is then rectified to D/C and sent to the battery and ignition switch which in turn supply the CDIs,lights etc. For the CDIs to discharge and send current to the ignition coils to fire the spark plugs they need the signal and obviously at the right time. This is done by the pulse generators and flywheel. A/C voltage is generated in the pulse coils and sent to the CDIs. When this signal is recieved then the CDIs discharge the stored current which is converted back to A/C and sent to the ignition coils. Without the signal from the pulsers the capacitors in the CDIs may be charged but current will not reach the spark plugs, hence no spark. This is probably obvious to most of you when you look at the wiring diagram. Anyway hope this might be useful to someone struggling to understand how it all works. If i have got this all wrong someone please put me right. Regards to all.