Posted by Ken Christopherson on January 14, 2019 at 01:04:47 from (156.98.247.156):
In Reply to: Magneto ? posted by WW2N on January 13, 2019 at 21:32:03:
Also, regarding your question about rotor and drive shaft timing - they are set to give spark at a particular point in the rotation of the magneto... It has nothing to do with whether or not the engine is on TDC of #1. They are two separate systems. The magneto is timed internally to give spark at a particular drive lug angle. If the engine crankshaft, camshaft, and governor are in time, and the magneto is bolted up to that system, it (the magneto) is set to fire at the same time in the rotation, every time. Realistically, the governor/magneto drive is what causes the magneto to fire at a specific position in engine rotation. This is all getting WAY more in depth than we need to be.
Essentially, if you bolt the magneto up blindfolded, and hook up your wires, you have a 25% chance of being correct on the first shot. If not, you can simply rotate the wires around to correct the firing order.
On a 2-cylinder JD tractor, it is even easier. Just flip the two wires around and it will go! :-)
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