On a side note – if you pry the float bowl off with the high speed needle valve in place, the needle will bend and is VERY hard to straighten.The idle needle valve adjusts the AIR in the idle mix. The amount of fuel used at idle is governed by the bypass tube running down through the center of the Venturi. Some idle needle valves have left handed threads and adjust normally. The others turn in to richen the mixture. This bypass tube is different on each model. It is also easily blocked by fuel residue.
