3. INSPECTION/ADJUSTMENT VITALITY 50 ENGINE IDLE SPEED 2-Stroke 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 (2) and air screw (1). Idle Speed: 2-Stroke: 1850100rpm 4-Stroke Throttle Stop Screw Adjust the idle speed to the specified range by turning the throttle stop screw and pilot screw. Idle Speed: 4-Stroke: 1800100rpm Pilot Screw AIR CLEANER Air Cleaner (2-Stroke) Remove the air cleaner cover by removing the 7 air cleaner cover screws and air cleaner housing cover (1). 3-10