Patent ID: 6402124
Filing Date: 2002-06-11
Classification: F02M,Y10S,Y10T

Abstract:
A carburetor fuel mixture adjustment assembly for adjusting the air-fuel ratio of a fuel mixture to be supplied to an engine, the assembly comprising:an interiorly threaded cylindrical needle valve receptacle formed in a carburetor main body, the valve receptacle intersecting a fuel passage formed in the carburetor main body; a needle valve body supported within the needle valve receptacle and including an exteriorly threaded portion, a needle and a shank portion disposed between the threaded portion and the needle, the threaded portion of the valve body being in threaded engagement with the needle valve receptacle, the needle being disposable within an axially-aligned needle seat orifice portion of the fuel passage and being axially advanceable and retractable, by rotation of the needle valve body within the needle valve body receptacle, to positions relative to the needle seat orifice to respectively decrease and increase the size of a portion of the orifice open to fuel flow; a valve spring concentrically disposed around the needle valve body between a head of the needle valve body and the carburetor main body in a position biasing the head axially away from the carburetor main body; and a needle stabilizer comprising a ramped surface cooperating with the valve spring in laterally biasing the needle into one position relative to the needle seat orifice to assure constant fuel flow through the orifice by resisting needle displacement due to such factors as engine vibration and installation of a tamper-resistant limiter cap on an outer end of the needle.