On my 05 Sportster, I have the Screaming Eagle a/c assembly and it works as follows. There is a formed plastic/ rubber tube that attaches directly to the breather bolts and into clips on the S/E backing plate. When the tube is snapped in place, it is directed right into mouth of the carb, no where else to go but into the carb. I had the same problem you are talking about and it completly dissapeared after putting the S/E kit on. Looking at about $140 for the kit and you can put it on yourself