Gadget Freak Case #235: Ignition Control Unit for Harley Davidson Panhead Engine
Edward Nauman designed an ignition control unit for the Harley Davidson Panhead engine. The unit can be adapted to almost any four-cycle engine with the proper design and fabrication resources. Click here for build instructions, BOMs, and more.
That is an interesting post, but I must have missed the part about the construction and the circuit. Of course since it uses a microcontroller it would be a real challenge to duplicate. My only motorcycles have had magneto ignition systems which are lighter and don't depend on a battery, which is sort of important riding way off road and off trail.
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