Hey everyone, got a question. Why is my 97 sportster 1200C start popping out of my intake once in a while. Most of the time its after about 30 minutes of riding. It only does it when i stop accelerating. I bought this bike used. It does have a after market staight pipe exhaust. And i dont know if the carb has been messed with. Can anyone give me some easy ways to diagnose why this is happening? Thanks all info is greatly appreciated