CARBURETTOR FOR 2-CYCLE INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To provide a carburettor for a 2-cycle internal combustion engine in which an opening operation characteristic of an air control valve can be adjusted in respect to a degree of opening of a throttle valve in the carburettor. SOLUTION: An air passage 25 is connected to a part near a scavenging port 33 of a scavenging passage 33a for communicating the scavenging port 33 of a 2-cycle internal combustion engine with a crank chamber 39a. A check valve 27 for allowing a flow of air toward the scavenging passage 33a is arranged at the air passage 25. There is provided an air control valve C for controlling an amount of air supplied from an air cleaner D to the air passage 25. Mixture gas of air and fuel is supplied from the air cleaner D to the crank chamber 39a through the carburettor B and a check valve 37a. In order to open or close the air control valve C in cooperation with the opening or closing operation of a throat valve 15 of the carburettor B, both an operation lever for driving the throttle valve 15 and a lever of the air control valve C are connected by a connecting rod 13 in such a way that a relative space between them can be adjusted.