If the points are just starting to open when the 'S' is centered in the window, they are set. No worrying about .020 setting. Some motors will require less or a bit more than .020 to have the timing set.
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DWayne
1973: 128, ag tires, 3pt. lift, spring assist, lights, 42" Deck
10" moldboard plow
2016 XT1 42" deck 18HP
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