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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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