Yamaha Lower Unit Assembly - 689-45300-17-4D is designed to significantly enhance the performance and durability of your Yamaha outboard engine. This premium lower unit assembly ensures smooth and efficient power transfer, improving your boat's handling and overall performance. Built from high-quality materials, it is engineered to withstand the harshest marine conditions, providing exceptional reliability and long-lasting service. Installing the Yamaha Lower Unit Assembly - 689-45300-17-4D is straightforward, allowing for seamless integration with your existing engine setup. Its corrosion-resistant construction reduces maintenance needs and extends the life of your outboard motor. Count on Yamaha's commitment to excellence and innovation to keep your engine operating at its best, ensuring a safe and enjoyable boating experience every time you venture out on the water. This product has been superseded by: 689-45300-18-8D. 689-45300-17-4D - LOWER UNIT ASSY