Thats 2.1 volts per cell = 12.6 volts if charged and setting idle (NOT on any charge system) so that 12.5 dont sound all that bad especially if the meter isnt perfect accurate. Similar, 6 volts on the coil is certainly sufficient for a good spark soooooooo I dont see low voltage as any cause of poor spark for now at least.....
To static start time a distributor I get No 1 cylinder at TDC on its compression power stroke,,,,,,,,rotate the distributor to RETARD the spark,,,,,,,,,,have the No. 1 plug removed but its wire attached n side grounded,,,,,,,,turn on the ignition,,,,,,,,slowly advance the distributor timing till the plug fires,,,,,,,,lock the distributor down. Then a timing light when running ought to show the spark steadily advancing as RPM is increased.
Check point gap, clean or replace points if badly burned or pitted,,,,,,,change spark plugs if you havent already and they are burned or fouled or badly carboned or oiled up,,,,,,,,,insure the distributor advance works correct and that theres no cracks or moisture or other cap problems,,,,,,,,,,you may just need new points or the cap has a problem or moisture in it or you need plugs or wires assuming the fuel n carb are all okay?????????
John T Im NOT an IHC guy so take this fer what you paid as its worth i.e NOTHING lol
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