I was provided with a 'sketch' of the ignition and it indicates that each coil fires the front and rear pot.
Same as Robert, running Lucas RITA I picked up the bike late last summer so not 100% familiar with it. The supplied paperwork has a Mistral Eng' ignition diagram that indicates 17M6 coils (?). DYNATEC paperwork states coils available 5ohms DCS 8-1, 3 ohms DC1-1 , 2.2 ohms DC4-1 and 1.5 ohms DC2-1.
The ones that should be fitted are the 3 ohm then, rather alarming that quality control allows coils of only 50% of the specified resistance.
I guess testing the resistance is as easy as setting the resistance range on meter and shoving probes in between input and output? 3 ohms being the desired reading give or take 10%.
I don't recall any specific identifying stamps on the coils but then haven't inspected that closely. If coils read OK I guess I'm looking at plug and more likely carb if the plug is fouling however they did not look too bad to me. I'lll have another ferkle and update.