Yamaha Lower Unit Assy - 6FR-45300-02-NA. The Yamaha Lower Unit Assy - 6FR-45300-02-NA is meticulously engineered to provide exceptional performance and reliability for your Yamaha outboard motor. This lower unit assembly ensures a precise fit and optimal functionality, significantly enhancing your marine engine's overall efficiency. Constructed from high-quality materials, it is built to endure the toughest marine conditions, offering long-lasting durability and consistent performance.. With the Yamaha Lower Unit Assy - 6FR-45300-02-NA, you can expect smooth and efficient power transmission that minimizes drag and maximizes thrust. This results in better 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, delivering a reliable and enjoyable boating experience.. This product has been superseded by: 6FR-45300-03-NA. 6FR-45300-02-NA - LOWER UNIT ASSY