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Everyone has it correct but let me try. The coil has two sets of windings & this motor has two coils. The first set of windings has two ends like a roll of rope. Either end goes to the opposite spark plug. The primary winding is built different too. It has more winds than a 1 cylinder motor in order to make more energy to power the secondary winding as it fires two plugs using either end of the winding. That circuit must be balanced electrically speaking in order to fire both plugs. Measure with your ohm meter (resistance) how much energy it takes to travel all the wraps & to the other end just like any coil. Once the coil see’s a little less resistance it travels to that air gap of the plug. Now at that micro second the coil see’s a connection thru the air gap & releases the rest of it’s stored energy firing the second plug. Now with this motor the second magneto, yes it has two systems it repeats the cycle to fire the third & fourth plugs. Check the second coil the same as the first set. Little known fact if you screw down one plug wire to ground it will double the hot voltage just to fire only one plug. If that coil fits your magneto it will give a much hotter fire for racing or what ever. It would fire a two plugged cylinder for a better burn too. These coils can be mounted outside the magneto & use battery power instead of magnets, then you can run a tube of neon across the top for lighting. I’m thinking WAY out of the box but it would function. Just run a wire from the points & have some FUN!! Te He He!!