For a puller I am going to assume you have made alterations to the original engine. That may or may not include increasing bore, stroke, compression ratio etc. This pretty much brings you to the point that battery ignition is your only choice to obtain the correct spark advance curve. Can't do much about a curve with a magneto. Once running it has fixed advance and that is it. Also, I used to have a whole box full of magneto's in the test room that were replaced with battery ign units. I rummaged through those for years picking the best left over parts to repair magnetos that were still in use. The parts became so expensive and unavailable it was not practical to buy new parts for repairs. Impulse couplings were the worse. We found alternate places to buy less expensive coils than IH but most other parts had to come through regular IH parts. There is actually considerably more to wear out in a H4 magneto than in the IH distributor. I will add also again. A magneto and battery ignition both use and have to have a distributor when used on a typical multi cylinder as used on farm tractors. Just kind of a thing with me when so many refer to a battery ign unit as a distributor. Far as original, magnetos and battery ign were options for several models for several years so either could be original. Generators work great. It is the more recent regulation systems that are the major problem. IH stayed too long with the 6 volt system and gave us tremendous problems in the later tractors like the 400 and 450 gasoline tractors. Five foot long battery cables, live hydraulics, independent pto drag, higher compression, just plain trouble right off the rail car brand spanking new.
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