Yamaha Lower Unit Assembly - 6E9-45300-01-4D. The Yamaha Lower Unit Assembly - 6E9-45300-01-4D is a high-quality replacement part designed to keep your Yamaha outboard motor operating at its best. Crafted from premium materials, this lower unit assembly offers exceptional durability and resistance to corrosion, ensuring reliable performance in various marine environments. Its precise engineering guarantees a perfect fit and smooth operation, making it an essential component for maintaining the efficiency and longevity of your marine engine.. Engineered for easy installation, the Yamaha Lower Unit Assembly - 6E9-45300-01-4D integrates seamlessly with your existing motor setup. This robust assembly enhances overall motor performance, providing dependable and efficient operation on the water. Rely on Yamaha's expertise and commitment to quality with this essential lower unit assembly, designed to withstand the rigors of marine conditions and keep your boating experiences smooth and troubl