Originally Posted by fastdirt505
Mine definitely backfires under 5k rpm with the throttle closed. I have my spark arrestors out of the FMF pipes which makes it worse. I have to decide if I want heads to turn when downshifting to a stop or not. If I don't want the attention I just pull in the clutch or you can give the throttle just a slight turn to silence the pops. The bike runs great but backfires.
I just recently installed the CPR intake and CJ Designs jetting and all the backfiring went away. I am still running the FMF pipes without the inserts. I guess my bike wasn't jetted correctly coming from Florida to Georgia, although it ran fine it backfired. Now the backfiring is gone.