Have to disagree with you on this. You are making 2 potentially dangerous assumptions. One is that a failed impulse coupling is going to completely fail to total nonfunction. The other is that hand cranking speed is always to slow to produce any spark.
A properly functioning impulse coupling will produce a uniform, loud click as each cylinder reaches the proper position. If it doesn't do that, DON"T HAND CRANK IT! When they are not working right, they can behave erratically, possibly latching in then tripping early. early tripping will produce an early, although somewhat weak, spark. This can definitely produce a kickback.
That is just one hazardous scenario with a non-working coupling. There are others.
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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