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Good info from Richard and Mumbles…. If I may, a point of clarification that may help folks understand this "timing" issue. Setting the points, either with a feeler gage , Franks’ tools or a light/ buzzer sets the optimum "timing" relative to the electrical operation of the magneto…opens the points to interrupt the primary current flow at the instant of maximum magnetic flux density. This this is a fixed relationship within the magneto and has nothing to do with piston position relative to top dead center (TDC). Timing of the spark relative to TDC is varied and controlled by the movement of the magneto plate or magneto body. So you see that for a motor having a magneto there are actually TWO separate and distinct timing issues.
I hope that this helps…
Joe B