Posted by Janicholson on April 18, 2023 at 15:47:42 from (24.240.46.228):
In Reply to: Magneto replacement posted by tomturkey on April 18, 2023 at 14:05:50:
one thing makes a distributor better than a mag. Distributors have a centrifugal advance built into the drive that advances the spark timing from idle speed to full no load speed. this advance curve allows a far better idle and low/middle speed engine performance and smoothness, as well as economy. A Mag (used on these tractors) has two timing positions only. On cranking and at cranking engine speeds (hand crank or starter motor) the timing is at or just retarded from TDC. This prevents kickback and broken arms when crank starting and starter motor damage if using a battery starter. The result is that the engine is at full advance when operating at all speeds. This makes for somewhat rough operation at anything but high speed full throttle operation. Though the difference is not obvious unless the timing is changed to full advance when a distributor equipped engine is idling, it is notably better to have the curve. Jim
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