The DC generator is mounted under flywheel of all Briggs riding lawn mowers engines. On the S1R9A9M9 engine of 2008, it had what what called DUAL ALTERNATORS. The red and black wire is actually (2) separate AC alternators output. The opposite ends of the coils are grounded under the plastic ring under the flywheel. Black is AC power, not a ground wire. The 2 AC wires extend to rectification to recharge battery or provide power to extra circuit. It is UNUSUAL to use the 2 wires at same time for same purpose, instead of headlights + charging line. The flywheel contains 13 permanent magnets. 12 for the generator and 1 for the ignition. No input is used to run generator or ignition other than turning crankshaft. When hydrogen gas fuel is made at spark plug , the engine starts running. The battery was used for the starter motor only, then completely shut off. Power to make electrolysis is then coming from generator at idle speed. Salt water is allowed to flow into top of carb from hose + bottle. Diodes needed to get DC to make low efficiency electrolysis of water. Fuel gas forms at tips of spark plug and fires same time. The added wire coil changes the timing ,as is needed with hydrogen. The spark plug receives what is called pulse PEAK DC current as about 10A. Spark plug was changed to Champion QC12YC at 125 ohms , rather than original 4000ohms resistance. They also come apart to remove resistor to get a Zero ohms racing plug. ( copper #12 wire segment replacement) Inverter box of 300-500W used with primary side of 9-10 amps DC from idling alternators. 110v DC full wave used from secondary side for firing spark plug. Peak pulse amps + average amps over the cycle time. The separate electromagnet 20 turns wire over plug wire, of 5 amps, causes extension of spark time for about 34% duty cycle. Firing Hydrogen requires late timing.
You can verify an old used engine would just run by adding 70% alcohol, or acetylene gas from carbide stones + water added, or also Ether spray into carb. The sound of Nathren's water engine on hydrogen from 2008 sounds like a water pump. Youtube (2 )videos by S1R9A9M9
You can verify an old used engine would just run by adding 70% alcohol, or acetylene gas from carbide stones + water added, or also Ether spray into carb. The sound of Nathren's water engine on hydrogen from 2008 sounds like a water pump. Youtube (2 )videos by S1R9A9M9