The 15C - 9 idle screw is a perfect fit for HL166 and HL334 models. It ensures smooth and accurate idle speed adjustment, enhancing engine performance.
Using this Tillotson 15C - 9 idle speed screw is easy. First, locate the idle screw on your HL166 or HL334 engine. Then, turn the screw clockwise to increase the idle speed and counter - clockwise to decrease it. When adjusting, do it gradually and listen to the engine's sound to get the right speed. As for maintenance, keep the screw clean from dirt and debris. You can use a soft brush to clean it regularly. Also, make sure not to overtighten the screw, as it may damage the engine components.
