Patent ID: 6354251
Filing Date: 2002-03-12
Classification: F02B

Abstract:
An air-fuel ratio control system for maintaining at a nearly constant level, the flow rate ratio between the air-fuel mixture and the air to be introduced into the combustion chamber of a stratified scavenging two-cycle engine in which an air-fuel mixture passage having a throttling valve for controlling output is connected to the crankcase, and in which an air passage having an air valve for controlling flow rate is connected to the scavenging passage that connects the aforementioned crankcase to the combustion chamber, whereinthe aforementioned throttling valve and air valve are each connected to a gear, and the aforementioned two gears engage each other only when the throttling valve is opened beyond the slightly open position, such that the aforementioned air valve opens and closes in conjunction with the opening and closing of the aforementioned throttling valve.