12. CARBURETOR VITALITY 50 Auto Bystarter AUTO BYSTARTER INSTALLATION Install the auto bystarter into the carburetor body until it bottoms.. Install the set plate and then tighten the two screws. Screws Set Plate FLOAT CHAMBER Remove the two float chamber screws and the float chamber. Screws Float Pin O-ring Remove the screw and O-ring. Remove the float pin, float and float valve. Float 12-10