has anyone had a problem with their yfz 450 like almost dying wen your going slow or just idling along in the bottom of any gear and you give it all the throttle , i trying to figure out if its a carb problem or its misfiring and does and anyone that lives in missouri have a two brothers pipe and quad filter and it jetted wit a boyenson carb and a scary fast power now if you do what size are your main and pilot

does anyone know whats wrong