In other words, it fires both plugs @ the same time as per Rolands schematic.
Usually when a coil only fires one plug, but not the other, the coil is bad, but remember you need to check the coil -to- plug wires as well as the spark plug could be bad.
It also might be noted I have found that a weak/marginal battery can cause a no spark condition on one plug while cranking, as all the power is being used for the starter with little left for a marginal/weak coil to fire both plugs.
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