banshee exhaust fire cracker pop help

[91banshee]

my left side is poping like a fire cracker ,what in the world is it , i checked and made sure the o rings were good so theres no coolent leaking , it has a cool head 19cc dooms , i looked at the v forse reed valves and they looked fine ,it has the trinity stage IV kit with the cv sudco single carb setup. it dosent matter if it is held wide open or idle it makes the same pop loud crack the right side dosent do it .any ideas

thanks