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 - Tractor Profile: Ford 600 Series - by Staff. The Ford 600 Series tractors bean production in 1954, and continued until 1957. Quite similar to the Ford NAA (Golden Jubilee) in design, it used the same 132 cubic inch Red Tiger engine with 31 horsepower. Several different models were made in the 600 Series, and these numbers were used to denote whether they used a particular transmission, hydraulic system, or PTO. The result was five different model numbers: 620, 630, 640, 650 and 660. These break down as follows:
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