Carburetor apparatus

Claim 1

An injection apparatus for a carburetor, comprising: an elongate side wall supported member adapted to be connected at one end to a fuel line and further adapted to extend from a side wall into the flow path through a venturi throat, therebeing a passage means therethrough communicated with a source of fuel to be vaporized by such a carburetor equipped with a side wall adjacent to the venturi throat of the carberator; an enlargement at or near the end of said elongate member and having an encircling portion about a passage which can be positioned in alignment with air in flow through the venturi throat during carberator operation; a downwardly facing shoulder in said passage, said shoulder overhanging an opening means communicated with said passage means such that fuel to be vaporized is introduced into said passage sheltered by said shoulder; a valve in said passage means which includes a rotatable threaded stem; a mating threaded receptacle in said elongate member intercepting said passage means; a seat in said passage means at said receptacle; a hole in said stem selectively aligned and mis-aligned with said passage means; spring means bearing on said stem in a manner resisting unintended rotation thereof; and Wheresaid shoulder is formed by an off center non-concentric arc of a curve in said enlargement which extends at least partly around the passage in said enlargement.