Yamaha Lower Unit Assy - 6G9-45300-15-EK. The Yamaha Lower Unit Assy - 6G9-45300-15-EK is meticulously crafted to deliver superior 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 designed to withstand harsh marine environments, providing long-lasting durability and consistent performance.. With the Yamaha Lower Unit Assy - 6G9-45300-15-EK, 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, delivering a reliable and enjoyable boating experience.. This product has been superseded by: 6G9-45300-16-EK. 6G9-45300-15-EK - LOWER UNIT ASS