As most of you know from recent post. I tried rebuilding my old carb but I never could get the float to stop sticking. so I bought a new one. I installed it yesterday. adJusted the idle and it sounded great. no leaks. but when I dialed the idle to spec it back fired thru the carb and blew it off. the old carb never did that. also it only happens at low idle. mid to high idle it never happens. I checked the timing and valve lash to make sure that wasn’t the issue. is there an adjustment for this? It’s not a mikuni. it’s a khe? Any advice would be great