Patent ID: 7287742

Claim:
A carburetor that provides a fuel and air mixture to an engine, comprising: a body having an air intake passage and a fuel passage in communication with a fuel source; a first valve having a valve shaft and a valve head disposed in communication with the air intake passage and movable between a first position corresponding to idle engine operation and a second position corresponding to wide open throttle engine operation; a tube having a wall with a first opening through the wall and a second opening axially spaced from the first opening and communicating with the fuel passage for fuel flow through the tube and the openings, the first opening being elongated axially relative to the tube and having an axially elongated and concave first face extending between inner and outer edges of the wall of the tube, an opposed axially elongated and concave second face extending between inner and outer edges of the wall of the tube, and the flow area of the first opening defined at least in part by the concave faces increases in a radially outward direction; a second valve disposed in communication with the fuel passage and movable between first and second positions to vary the flow rate of fuel through the first opening of the tube, whereby the first valve controls at least in part the air flow out of the carburetor and the second valve controls at least in part the fuel flow out of the carburetor; and an actuator associated with the first valve and the second valve to cause movement of one of the first valve and second valve in response to movement of the other of the first valve and second valve.