Yamaha Lower Unit Assy - 6FM-45300-11-8D. The Yamaha Lower Unit Assy - 6FM-45300-11-8D is expertly crafted to provide superior performance and reliability for your Yamaha outboard motor. This lower unit assembly ensures a precise fit and optimal operation, enhancing the overall efficiency of your marine engine. Made from premium materials, it is built to withstand harsh marine conditions, delivering exceptional durability and dependable performance.. With the Yamaha Lower Unit Assy - 6FM-45300-11-8D, experience smooth and efficient power transmission, minimizing drag and maximizing thrust. This leads to improved fuel economy and a more enjoyable boating experience. Trust in Yamaha's commitment to quality and innovation with this lower unit assembly, ensuring your boat performs at its best in all conditions, providing you with a reliable and enjoyable time on the water.. This product has been superseded by: 6FM-45300-12-8D. 6FM-45300-11-8D - LOWER UNIT ASSY