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Boyer
Stu,
If your battery and charging system are in great shape, your plug leads and plugs are perfect and not resistance (or suppressor) type, the BSA "may" run OK with 12V coils. If any of these is less than perfect or over time degrades to a poor condition, you may (read "will most likely") have trouble with 12V coils. Delivering 6V (in effect) to a 12V coils is like trying to run a 12V lamp with 6V - low output.
Personally, I tried the 12V coils, and with a weak "standard" lead-acid battery, had heaps of trouble. As soon as I went with 6V coils, and an AGM maintenance-free battery, problems gone.
Pete
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Per Ardua Ad Astra
(Through difficulties to the stars)
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