Some popping is absolutely normal. If you have noted an increase the frequency and significance in the pop, check that the 2 plugs have not come out of the front and rear exhaust pipes. I have a post out there on the rear plug, it can be seen through the hole in the rear heat shroud on the right hand side of the bike. The front plug is behind the front heat shield and can be seen front the lower opening in the right side fairing.
If those are in place it is probably the sound everyone is describing and love to hear.