I finally found a reference on how to increase ignition high volts, quite easily, like Nathren-S1R9A9M9 did, from lawn mower Magnetron output. Data is from 2008, where poster Capacitor70 placed several notes regarding the method. It has to do with adding in 3 capacitors and firing a mounted ADJUSTABLE TYPE SPARK PLUG TESTER The wiring hooks to a  2 1/4" Diam  gray ferrite torroid core FT240-31  as step up transformer with 8 + 24 turns. The secondary side hooks to the main spark plug, and also the additional power supply amps. The transformer wires should be insulated high voltage silicone cables. I am using white 30kv and red 30kv. Winding directions polarity have to be figured. (Automotive ignitions are usually quite high in volts, contrary to lawn mower engine's Magnetron). A Briggs Magnetron is a pre1982 Magneto with a solid state trigger module epoxied in, and is all a one-piece unit.  Total capacitance  in series as less than 1000pf at  6kv to 24kv total. Has to do with speed of resonance of Primary  L and C. Suggested use was 2200pf+3900pf+7500pf. Use electronics formula for capacitors in series. The transformer will work for both negative and positive high voltage. While High V is going, must slowly adjust the first gap, to get the second gap to fire.   EAY purchase orders less costly than Amazon that has minimum $35 order for no shipping charge. Some separate electronics companies have a minimum dollar order plus shipping plus sales tax. Someone back at that time had converted a Volvo 4cyl car engine to water, using the toroid method.  Capacitor70 converted 3 different motorcycle engines that ran on water in carbs.HE said the new method was better than string of series diodes that overheats and melts the solder joints. (I don't see this toroid  as any protection for main power supply.) He said there is an isolation factor. I also don't really believe it was just coincidence that the (2) S1R engine demonstrations came out in the same time summer 2008 as the capacitor70 tech data! Several drawings on Internet are wrong for the spark plug hook up for capacitor70 circuit. SEE THE ACTUAL TOROID CORE PICTURE FOR ORIGINAL USED AS GREEN WIRE HOOKED TO ACCESSORY FIRST  SPARK PLUG TOP! The higher turns brown magnet wire is secondary step up as volts 1:3. The secondary side should hook to spark plug top and ground, CONTRARY TO THE OTHER INTERNET DRAWINGS. The circuit will allow for PLASMA PATH for the following amps injection.See other notes about the S1Rcoils as an actual hand wound step down transformer ratio 13:7, to use the low amps pulsing DC from output of dual alternators ring, to raise it up to flow the 10amps as stated., when only at idling RPM. The 7 turns wound same way as 13 turns, requires the steel nail/screw core underneath for proper magnetic field. The exterior extension cord that's split in the videos, allows connection to ground exactly at spark plug ground. Ground point same as for both 1st spark gap and tap to ground for S1R coils.The elecromagnet also provides the needed field that EXTENDS the spark time - slows it down from 0 to to minus 34 degrees proper late timing. A separate coil L of about 1.75 Millihenry is also in the high voltage line for further time extension. (Car battery first allows current, then removed.) The plastic sealed deli tub on side of Briggs engine contained BOTH the S1r coils assembly + the step up high voltage  pulse transformer with spark gap and capacitors. Nathren had said there were no capacitors used. He was untrained and ignorant, and was thinking about CONDENSERS - the old wording. The three actual technicians in Georgia workshop designed and built all the circuits,- not him. He said so. All this has to do with electrolysis at spark plug for hydrogen gas and water vapor pressure for self running engine, as was shown on Youtube video - S1R9A9M9 (2) videos and Nathren's now shut down web forum.