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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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