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Fogcutter,
I guess it comes down to this: if your electrical system is perfect in every other way (eg battery in great condition, charging system perfect, wiring perfect, coils in great condition, spark plugs perfect, and copper-core leads with no suppression caps, then you can use existing 12V coils hooked in series, as per the instructions. If any of these things goes down in performance (especially battery), you may have trouble with 2 x 12V coils. The Boyer limits coil primary voltage to 400V, and if you're spreading this across 2 x 12V coils, that's 200V per coil. Enough to get a spark, but if anything starts to degrade, the spark will be weak. The good thing about using 12V coils is you can always slip the points back in, re-wire a bit, add condensors back in, and you're back up and running.
The other way of doing it is to use 2 x 6V coils - electrically the same as 1 x 12V coil with two HT outputs. This will be more forgiving in terms of electrical system degradation, and you get a stronger spark. The downside is the cost of 2 coils, and not being able to swap to points without putting the 12V back in. You can also get a single 12V coil with dual HT outputs.
I've tried both ways (12V and 6V coils), and currently have 2 x 6V coils - I won't be going back to 12V coils, because the ignition system is much more reliable in it's current config.
Hope this helps.
Pete
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Per Ardua Ad Astra
(Through difficulties to the stars)
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