11. CARBURETOR ZX / SCOUT 50 CARBURETOR INSTALLATION Check the carburetor insulator and O-ring for wear or damage. Install the carburetor and insulator onto the intake manifold and tighten the two lock nuts. Connect the fuel tube and auto bystarter wire connector. Insulator Install the carburetor cap. ( 11-4) Install the air cleaner onto the carburetor and tighten the band screw. Carburetor Cap Install the met-in box. ( 12-4) AIR SCREW ADJUSTMENT Remove the met-in box. ( 12-4) Turn the air screw clockwise until it seats lightly and back it to the specification given. Air Screw Opening: 1 turns Start the engine and turn the air screw in or out slowly to obtain the highest engine speed. Air Screw Turn the throttle stop screw to obtain the specified idle speed. Idle Speed: 2100100rpm Slightly increase the engine speed and make sure that the engine does not miss or run erratic. If the adjustment of the air screw within the range of turn makes no difference to the engine performance, check other related Throttle Stop Screw items. 11-11