2012 KLR650 with stock muffler. I am having a lot of popping on decel and i can't pin down what is causing it. I have removed the AIS and installed Eagle Mikes block off plate. I have replaced the the header gasket. It seems to run good other than the popping and when I say a lot I mean a lot. The carb has been jetted using the KLX jetting by Eagle Mike.The air filter is clean. I did have another issue today. The idle was about 1,100 so I thought I would up the idle to see if it helped the popping. Well, I turned the idle adjustment screw one full turn and it didn't change the idle at all. Well, maybe it changed it a little. I have never turned it one full turn without the idle going way up. Can anyone offer suggestions as where to look? I have gone over everything twice and nothing changes.