Ah ha. Now I understand. The magnets flying by the coil generates it's own electricity for the spark, got it. Hard to start and heavy. So the electronic ignitions are lighter, except for the battery pack you must have to operate it, but makes for easier starting. After searching the forums here for conversion pics, I think this little engine belongs in the trimmer, not in an airplane! I may have to go shopping at Lawnstation! Thanks for everyone's help, much appreciated!

Tommy