Enhance your engine's performance with the Tillotson HL166/HL334 Low - Speed Needles, model 43 - 388. These screws feature a convenient screwdriver adjustment style, allowing for easy tuning and precise control of your engine's idle mixture.

Using these Tillotson idle mixture screws is a breeze. First, locate the low - speed needle on your engine. Use a screwdriver to adjust the screw according to your engine's needs. Turning it clockwise will lean the mixture, while turning it counter - clockwise will richen it. When adjusting, do it slowly and listen to your engine's sound to find the optimal setting. As for maintenance, keep the screws clean and free from debris. Check them regularly for any signs of wear or damage. If you notice any issues, replace the screws promptly to ensure your engine runs smoothly.