Abstract: A carburetor assembly which has a body formed of extruded aluminum and a plastic fuel bowl assembly secured to the body by means of a resilient spring clip. A gasket is located between the body and the fuel bowl. The fuel bowl is molded of plastic and includes an integral well, and a mixing screw housing as well as a primer housing. A plastic nozzle extends from the well through the venturi insert into a through passage into the body. The venturi insert is made of plastic material and includes molded grooves therein which form passages with the through passage of the body. The nozzle is resiliently urged against the gasket and the body by means of a spring located in the well thereby sealing the nozzle to the body.

Abstract: A main carburetor body has generally cylindrical bores into which are precisely and removably fitted liners. The inner liner surfaces are contoured as a venturi wherein a circular inlet section narrows down to a throat after which the outlet section gradually expands in flow area. Fuel discharges into the venturi through a plurality of ports in the venturi wall, these ports being located around the periphery of the venturi and generally in the vicinity of the venturi throat. Booster venturis, which in conventional carburetors obstruct the flow path, are not used. The carburetor is readily modified by removing the liners and installing a new set of liners which may have different dimensions for the venturi and a different port pattern for fuel inlet to the venturi.

Abstract: A motorcycle engine carburetor has an easily removable and replaceable venturi tube, an easily removable fuel jet tube, a swiveled fuel inlet fitting, an easily adjustable and downwardly accessible and rotatable starting carburetor accessible air jets, together with additional structural improvements.

Abstract: An improved rotor-type carburetor for use with an internal combustion engine is provided which, in one embodiment, is adjustable to selectively vary its constant fuel-air ratio by axially moving an internal body portion thereof relative to the turbine rotor assembly of the carburetor. Alternatively, the constant fuel-air ratio of the carburetor may be altered simply by replacing such internal body portion with a differently configured one. Undesirable fuel delivery from the turbine rotor to the engine during turbine spin-down is significantly diminished through the use of an internal fuel reservoir structure, formed within the carburetor body, which functions to capture and retain unneeded fuel discharged from the rotor during turbine spin-down periods. During turbine spin-up periods (e.g., when the engine is being started) the reservoir-retained fuel is released into the engine's incoming air stream to hasten fuel delivery to the engiune during initial portions of turbine spin-up periods.

Abstract: A fuel economizer for internal combustion engines which increases turbulence of the fuel and air mixture in the carburetor by decreasing the throat of its venturi to a predetermined minimum necessary to induce fuel flow through its fuel jets and then downstream of the venturi adding further atmospheric air for complete combustion.

Abstract: A carburetor and fuel feed device for small internal combustion engines incorporating a pumping section which receives fuel from a supply and delivers the required amounts for the range of operation between high and low speed operation with any excess being returned to the source of supply. A control device is employed which permits deceleration from high to low speed operation without flooding by instantaneously preventing the supply of fuel for high speed operation in response to movement of the throttle valve to an idle or low speed position.

Abstract: A carburetor construction is disclosed which includes a plurality of plate members stacked one upon the other, the plates including recesses and openings which define fuel channels, and cavities which nestibly receive various components of the carburetor, the components being designed so as to facilitate assembly with each other.

Abstract: The disclosure embraces a charge forming apparatus or carburetor and method of operation thereof wherein the charge forming apparatus is of modular construction and is inclusive of a body construction and a fluid flow control construction associated with the body construction, the fluid flow control construction being of laminar character fashioned with open areas or passages accommodating fluid flow or transfer, the fluid flow control being of a character enabling the interchangeability of fluid flow control laminations having different or modified patterns or arrangements of open areas or passages whereby the method of operation or the operating or metering characteristics of the charge forming apparatus may be changed or modified without alteration of the body construction.

Abstract: A carburetor and fuel feed device for small internal combustion engines incorporating a pumping section which receives fuel from a supply and delivers the required amounts for the range of operation between high and low speed operation with any excess being returned to the source of supply. A control device is employed which permits deceleration from high to low speed operation without flooding by instantaneously preventing the supply of fuel for high speed operation in response to movement of the throttle valve to an idle or low speed position.