US Patent 7513487 Carburetor

To provide a carburetor in which, when a set screw is detached, a jet needle can also be detached along with the set screw. A carburetor of the variable venturi type has a venturi piston to adjust the venturi of an intake passage that is provided in a carburetor body. In the carburetor, the jet needle is attached as a unit with a cap member by screwing the cap member into the venturi piston. The carburetor includes a retaining mechanism, with help of which the cap member is engaged with the jet needle to form a single unit, when the cap member is detached from the venturi piston.