3. INSPECTION/ADJUSTMENT ENGINE Throttle Stop Screw BODY At High and Low Speeds The engine must be warm for accurate idle speed adjustment. Adjust the idle speed to the specified range by turning the throttle stop screw and air screw. Idle Speed: 2100100rpm Air Screw Air Cleaner Screws Remove the air cleaner cover by removing the six air cleaner cover screws. Remove the air cleaner element. Air Cleaner 3-8