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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