Patent ID: 7261282

Claim:
In a two-stroke internal combustion engine having a frame with a cylinder, a piston movable in the cylinder, and a carburetor connected to the frame, the carburetor comprising a first channel for supplying an air/fuel mixture to the engine, and a second channel for supplying air to the engine, a throttle valve assembly for at least partially opening and closing the channels, and a choke valve assembly, wherein the improvement comprises: the throttle valve assembly comprising means for substantially blocking air flow to the engine through the second channel at an intermediate position of the throttle valve assembly located between an idle position of the throttle valve assembly in which air can at least partially flow through the second channel and a wide open throttle (WOT) position of the throttle valve assembly in which air can at least partially flow through the second channel wherein the means for substantially blocking air flow comprises the throttle valve assembly having two valve section each valve section being located in a respective one of the channels, a second one of the valve sections having an air bleed hole therethrough, wherein the second valve section is movable relative to the frame from the first idle position to the intermediate closed position and then to the wide open throttle (WOT) position, and wherein the air bleed hole allows flow through the second channel at the first idle position, but does not allow flow when the second valve second is at the intermediated closed position.