Patent ID: 6334606
Filing Date: 2002-01-01
Classification: F02B,F02M,Y02T,Y10S

Abstract:
A carburetor for a two-stroke engine having separate scavenging air and fuel and air mixture intake passages, the carburetor comprising:a body, a scavenging air passage through the body, an air valve in the scavenging air passage configured to control the flow of air through the passage to the engine scavenging air intake passage; a fuel and air mixing passage through the body for supplying a mixture of fuel and air to the engine fuel and air intake passage, a venturi in the mixing passage, and a throttle valve in the mixing passage to control the flow of a mixture of fuel and air through the passage to the engine; and a diaphragm carried by the body, defining in part a closed low pressure chamber and connected to the air valve to open and close the air valve in response to movement of the diaphragm, and a passage continuously communicating the venturi with the low pressure chamber and configured so that when the engine is operating and the throttle is initially rapidly opened, the opening of the air valve is delayed to ensure a sufficiently rich fuel and air mixture is supplied to the engine to support acceleration.