Patent ID: 6945520

Claim:
A carburetor, comprising: a body having an air intake passage, and a throttle valve chamber communicated with the air intake passage; a rotary throttle valve slidably and rotatably received in the throttle valve chamber between idle and wide open positions to control the delivery of a fuel and air mixture to the engine, and having a valve shaft, a hole through the valve shaft to control the flow of air from the carburetor, and an air passage formed at least in part in the valve shaft that is in communication with the air intake passage during at least a portion of the throttle valve movement away from its idle position; a fuel nozzle carried by the body and through which fuel flows prior to being discharged from the carburetor; a needle carried by the throttle valve for reciprocation relative to the fuel nozzle to change the effective flow area of the fuel nozzle and thereby control the delivery of fuel from the carburetor; a start shaft carried by the carburetor body for movement between first and second positions; and a cam operably associated with the start shaft and adapted to axially move the throttle valve away from its idle position to move the needle relative to the fuel nozzle and increase the effective flow area of the fuel nozzle permitting an increased fuel flow through the nozzle whereby the movement of the throttle valve when the start shaft is rotated to its second position communicates the air passage of the throttle valve with the air intake passage to permit increased air flow through the carburetor.