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Re-jetting the carbs may be needed. Imbalance of air/gas ratio will cause backfiring among many other things. :)
Other considerations: Have the timing and valves set.
After market pipes will also increase the Poping sound when you let off the throttle. (not really backfiring but annoying) Removing and plugging the AIS system will stop most of this.
you need to either clean your carbs or you have a valve out of adjustment mine was doing same thing because of dirts carbs hope that sheds a little light on subject
try pulling the choke out a little and see if that doesn't help. If it does that is a sign that you are running too lean and need the jets in the carb increased or just the air mixture screw adjusted. If the coke test doesn't help, please tell me more about how and when it acts up. Like after the motor is warmed up does the backfiring quit?
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