A magneto fires when the points open. When properly timed this happens at 23° BTDC. With the retard mechanism engaged the magneto stops turning while the engine continues to turn. In the case of the IH magneto the engine turns 23° before the dogs in the retard mechanism are released. This causes the spark to occur at TDC rather than 23° BTDC.
The spark control is just backwards from most battery ignition distributor system. The magneto has a mechanism to retard the spark while distributors use a mechanism to advance the spark.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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