NotTaR of small Gasoline Engines and Rotary Lawn Mowers : What is inside a small engine electronic..  
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What is inside a small engine electronic ignition module?

The advantage of these systems is that there is no maintenance as there are no points to wear out or gum up. Timing is fixed by the relationship of the flywheel magnet and sensor. There are also no adjustments except to set the magneto coil pole piece to flywheel air gap.

Replacement modules are available for many small engines to take the place of their original point type ignition system. These can be designed in several different ways but all must emulate the behavior of the point type ignition replacing just the magneto coil/pole piece assembly and without requiring alterations to the flywheel.

Not that any of this profound knowledge does you any good for repair as these things are usually quite well potted and impregnable.

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