3. INSPECTION/ADJUSTMENT AGILITY 50 2T CARBURETOR IDLE SPEED · The engine must be warm for accurate idle speed inspection and adjustment. Remove the inspection cover. Warm up the engine before this operation. Start the engine and connect a tachometer. Turn the throttle stop screw to obtain the specified idle speed. Idle Speed: 1900100rpm When the engine misses or run erratic, adjust the pilot screw. Throttle Stop Screw 3-5