Re: Stator function question
Yes, the stator produces the voltage that is used by the ignition coils. The charge coils in the stator, produce the AC voltage that is converted to DC voltage and then routed to the appropriate ignition coil, by the power pack.
There is typically an output test that can be performed to check the condition of the charge coils. There is also an ohms test that can be performed. I am far from an expert in electronics, but I would say, yes, charge coils can gradually lose output over time and use. My take on it is that as resistance increases, effectiveness decreases. Once again, however, that is a "hacker's" understanding of the situation. A charge coil can also short completely, which will be indicated by a zero reading when doing an ohms test.
That said, my experience with stators suggests that they either work well enough, or not at all. Generally, a situation where less than all of the cylinders in the engine are experiencing misfiring due to ignition problems, is caused by problems with the power pack, one or more ignition coils, high tension leads, etc. When the motor won't run at all due to ignition problems, the stator is often the culprit. Bear in mind though, that there are other issues that can be in play.
BTW, if you have a specific problem with your engine that you are trying to solve, the best way to get help in troubleshooting it, is to simply describe it here. Start with the make, year and model of your motor and then describe the problem.