Yamaha Lower Unit Assy - 6FM-45300-01-8D. The Yamaha Lower Unit Assy - 6FM-45300-01-8D is expertly engineered to enhance the performance and reliability of your Yamaha outboard motor. This assembly ensures a precise fit and optimal operation, boosting the overall efficiency of your marine engine. Constructed from premium materials, it is designed to endure harsh marine environments, offering exceptional durability and dependable performance.. With the Yamaha Lower Unit Assy - 6FM-45300-01-8D, experience smooth and efficient power transmission that minimizes drag and maximizes thrust. This leads to improved fuel economy and a more enjoyable boating experience. Rely on Yamaha's commitment to quality and innovation with this lower unit assembly, ensuring your boat operates at its best across various conditions.. This product has been superseded by: 6FM-45300-02-8D. 6FM-45300-01-8D - LOWER UNIT ASSY