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 - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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