Yamaha Lower Unit Assy - 6FR-45300-01-NA. The Yamaha Lower Unit Assy - 6FR-45300-01-NA is designed to deliver exceptional performance and reliability for your Yamaha outboard motor. This lower unit assembly guarantees a precise fit and optimal functionality, significantly enhancing your marine engine's overall efficiency. Constructed from high-quality materials, it is built to withstand the toughest marine conditions, ensuring long-lasting durability and consistent performance.. With the Yamaha Lower Unit Assy - 6FR-45300-01-NA, experience smooth and efficient power transmission, minimizing drag and maximizing thrust. This results in improved fuel economy and a smoother ride on the water. Trust in Yamaha's commitment to quality and innovation with this lower unit assembly, ensuring your boat operates at its peak in all conditions, providing you with a reliable and enjoyable boating experience.. This product has been superseded by: 6FR-45300-03-NA. 6FR-45300-01-NA - LOWER UNIT ASSY