The use of 4 field magnets produces more torque (and consumes a bit more amps) than a 2 pole. My concern is that there may be armature differences between the two setups. The armature pole to commutator segment offset. determines which winding gets what polarity when. As does the location of the brushes around the commutator. I would check the commutator carefully to assure the same offset configuration, and number of segments etc. One simple way to do this is to silver solder a copper stud to the top of the switch post on the starter body without the post. Crossing the field connection wires where they attach to the brushes (to the opposite brush should make it reverse, but it might not be in ideal time. Thus will run, but not optimally. Another option is to have a threaded stud put in to replace the switch post at a shop. No issue, broken stude are commonly replaced. JimN
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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