Yamaha Lower Unit Assy - 6G5-45300-28-8D. The Yamaha Lower Unit Assy - 6G5-45300-28-8D is expertly designed to deliver outstanding performance and reliability for your Yamaha outboard motor. This lower unit assembly ensures a precise fit and optimal functionality, significantly enhancing the overall efficiency of your marine engine. Constructed from high-quality materials, it is built to withstand harsh marine environments, ensuring long-lasting durability and consistent performance.. With the Yamaha Lower Unit Assy - 6G5-45300-28-8D, you can expect smooth and efficient power transmission that minimizes drag and maximizes thrust. This leads to improved fuel economy and a smoother ride on the water. Trust in Yamaha's dedication to quality and innovation with this lower unit assembly, ensuring your boat operates at its peak in all conditions, providing a reliable and enjoyable boating experience.. This product has been superseded by: 6G5-45300-2B-8D. 6G5-45300-28-8D - LOWER UNIT ASSY