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It could be the speed of one carburetor is faster than the other. This causes the backfiring as well as forces one cylinder to run lean which causes the tapping noise. You will experience an identical tapping or "ping" when you get close to empty on main fuel and need to switch to reserve. Most likely you or the previous owner unknowingly adjusted the speed of the rear carburetor down because of the high stock idle not realizing the front carburetor needs to be slowed down to match. While running simply turn the idle adjust screw clockwise on the rear carburetor until the idle smooths out and the backfiring/tapping stops.
If you remove the green cover from the fuse box under the seat, you'll find two 30 amp fuses in there. I don't know which one is the "main". Perhaps they function together in concert, so if one is bad, both are bad. . . I derived this info from youtube, and the video was for a different model, but it was a Suzuki. They are probably similar in wiring. But, full disclosure - I am not a motorcycle guy. Good luck.
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