Alright so finished my wr426 rebuilt the carb completely, the right way. I have an MSR fuel screw, stock exhaust, open air box. Im getting a really bad popping when revving, but not on decel? Possibly an exhaust leak or gas starvation? I've tried adjusting my mixture and such but nothing seems to help. What is the best jetting set up to run? Located in OH so elevation is about 500-800ft. Any suggestions are helpful, I know this is answered a lot. Thanks.