Lets think this through (I have questions later, hold on)
I don't see why a lawn mower coil magneto couldn't be made to work (but see caveats later). As long as a magnet, be it North or South Magnetic Polarity, passes fast enough by a coil of wire, a voltage is induced into the coils LV Primary which can be increased over in a HV Secondary AND THAT OCCURS IN A TRACTOR MAG when the points break/open the LV Primary current flow and the field collapses (so transformer action takes place). On the Wico its best for the points to break open at the time the primary current is at its max and that's 0.090 after the rotor magnet passes out of the armature laminations i.e the famous EDGE GAP SETTING which is APPROXIMATED by setting the points gap to 0.015
Now, if on the lawn mower single cylinder engine flywheel there were 2 magnets instead of 1, you would get a spark each time right. On the Wico Mags there is obviously a North and South end on the magnetic rotor so each spark is of opposite polarity BUT THAT DONT HURT THEY STILL WORK THAT WAY NOT withstanding how its best for the electrons to jump from the hotter tip to the cooler plug electrode but that's a whole other topic.
BUT on those small engine coils that mount by the flywheel that have the HV plug wire coming out of them IS THERE SOME ELECTRONIC SWITCHING GOING ON (replaces points open n close) which would be polarity sensitive therefore they may NOT work at opposite polarity???????????? I'm asking OR Is it simply that a sudden primary voltage spike occurs and as its diminished the magnetic field collapses thereby HV gets induced over in the secondary WITHOUT ANY NEED FOR SWITCHING?????????
Another question if you put 2 magnets on a single cylinder engine flywheel 180 apart CAN THEY BE THE SAME POLARITY I dont see why not. I don't really understand (never thought of it) if the magnets on the lawn mower engine flywheel are N one side and S the other or just what they are???
Soooooooo not an answer but just questions sorry Bob lol
REGARDLESS Ive still NEVER seen a direct bolt in replacement elec switched unit to replace an old tractor magneto, have you??? Sure they produce their own energy, but a solid state switching device uses bias and polarity sensitive energy that usually comes from a DC battery instead of a rotating reversing polarity more like AC Magneto, so I'm curious to see how they work and wouldn't bet a dime they're really out there like the good gents Walt n Old suggest?????IM NOT DOUBTING THEIR WORD, JUST LOVE TO SEE ONE
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