Backfiring is almost always caused by something wrong in the ignition allowing the charge to explode in the exhaust system instead of in the cylinder where it belongs.
When the fuel/air mixture isn't lit off in the cylinder as it should be at the proper time, it is then naturally pushed on out into the exhaust. The "late" occurring ignition pulse then couples with the "hot" charge in the muffler when the exhaust valve is open and you get that "bang" in the wrong area.
It's nothing to mess with. I've seen 'me rip the exhaust right off of the engine and open that muffler up like a tin can.
Look for bad/frayed wiring in the primary, wrong dwell setting, loose distributor shaft bushings, tracking cap, broken rotor and/or bad/corroded secondary wires. Rusted/bad connections at the coil tower.
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