A needle valve for use in the idle port of a carburetor, said needle valve having a cap retained foam filter covering an otherwise unobstructed passage extending axially compltely through the needle valve to permit moving air at atmospheric pressure, 14.7 pounds per square inch and at a speed of about 400 feet per second more or less passing through said passage to drive fuel passing through the idle port into the throat of said carburetor away from the walls of the throat,BUTTERFLY VALVES the needle valve being threaded into the carburetor housing and retained by a nut and lock washer. A needle valve for use in a carburetor having a throat,Needle Valves a fuel passage, an idle port communicating the fuel passage with the throat, and an internally-threaded bore of greater diameter than the idle port extending between the idle port and the exterior of the carburetor, said needle valve consisting of: an externally-threaded shaft adapted to be adjustably received in the internally-threaded bore of the carburetor with a first end thereof coaxially aligned in proximity with the idle port, Safety Valves a second end of said shaft formed to provide means to permit manual rotation of said shaft to adjust the spacing between said first end and the idle port, lock means adjustably mounted to the external threads of the shaft and adapted to be caused to releasably engage the exterior of the carburetor to permit subsequent inadvertent displacement once the shaft has been adjusted, said shaft having a single, unobstructed, straight, centrally disposed axial air passage covered at its inlet by a disposable air filter of synthetic resinous material, the filter being placed adjacent said inlet whereby adjustment in the threaded location of the shaft requires removal of the filter, the axial air passage extending completely through said shaft and providing direct communication therethrough of ambient atmospheric air and a press-fit pervious cap to retain the filter when in place and which can be removed to accommodate removal of the filter and adjustment to the shaft.

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