In Reply to: 8N breaking down as throttle is increased posted by William on June 16, 2023 at 11:13:08:
"One question I have is, when you convert the generator from to two brushes, as far as I can tell, aside from there being a different coil and distributor, you have the same components as in the diagram on page 49 of the FO-4 Should I be wiring it to this diagram and not the one for the early serial numbers?"
No. Front mount and side mount ignition systems are different, front mount should be wired as it is supposed to be wired, side mount should be wired as side mount is supposed to be.
"By using the new regulator 8N10505B and the early serial number circuitry, is that, along with the ignition resistor, weaking the spark?"
No. The only thing the ignition and charging systems have in common is they are both connected to the battery through the ammeter.
"But I still would like to know why in the later circuit the battery voltage goes directly to the coil while in the earlier circuit it goes through a resistor. Does the later coil have a built in resistor?"
The round can coil has sufficient resistance in the primary winding. No "internal resistor". The resistor used with the "square" coil is variable with temperature. Very low when cold, gets higher as the temperature increases. Its function is to provide a higher current to the coil when starting so as to compensate for the lower battery voltage when cranking, then to limit the current to the coil to a safe lever when the engine is running.
Please define "breaking down" in the context you are using it.