The electronic doodad under the distributor cap only triggers the spark. Spark strength comes from the coil.
I know "they" recommend some super-awesome flame-belching ultra-coil with the electronic ignition conversions. AFAIK they are true 12V coils.
Running straight 12V through the OEM coil will cook it within a few hours.
AFAIK, the 656 is supposed to have a 12V bypass running from the solenoid straight to the coil, so that the coil receives 12V during startup. The starter tends to draw the battery down, which causes a weak spark through the resistor.
Hopefully the owner also popped for the "special" coil when he installed the electronic ignition. Otherwise you will be replacing the coil here in the near future.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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