My son asked me and I didn't know the answer so I thought I'd pose it
here. His bike has two ignition coils. The coils are not the same,
they are from different years of manufacture for different models of
motorcycle. The timing is not the same for each cylinder, but should
be the same. The coils have different resistance. My son was wondering
if the difference in timing could be because one coil takes longer to
build up enough voltage to cause the spark plug to spark. The coils
are connected to the same control box. So I'm wondering if the voltage
rise from two ignition coils could be that much different.
Eric