This 2-wire (2-pin plug) cable is used in conjunction with an electric choke carburetor and serves as the control wire for engaging/disengaging the electrical choke. Often referred to as 'electric choke cable'.
Actuation Cable - GY6 Carburetor Cable, Electric Start
Carburetor - 12mm, PW50, Yamaha Pewee 50
Carburetor - 15mm, Includes Intake Set
Carburetor - 15mm, Manual Choke