When you changed to 12v, did you replace the coil or add a resistor?
It needs either a true 12v coil that doesn't need a resistor, or add a 1.5 ohm resistor to reduce the voltage to the 6v coil.
Running a 6v coil with electronic will overload the electronic circuitry and fry it, and or the coil.
Backfiring is a symptom, not a cause. Exhaust backfire is almost always a result of weak or intermittent spark filling the exhaust with unburned gas.
You can also check the voltage at the coil. Ground the - primary terminal, ignition on, with a 12v coil no resistor, should get near battery voltage. A 6v with a resistor should have 6-8 volts. Wiggle the ignition switch while testing to be sure it makes good connection. Work quickly, the coil will overheat while the ignition is on. Speaking of heat, a healthy, properly powered coil will run about the same temperature as the surrounding components. if it is uncomfortable to hold, it's too hot.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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