Yamaha Lower Unit Assy - 6GR-45300-04-CE. The Yamaha Lower Unit Assy - 6GR-45300-04-CE is expertly engineered to enhance the performance and reliability of your Yamaha outboard motor. This lower unit assembly ensures a precise fit and optimal functionality, significantly boosting the overall efficiency of your marine engine. Constructed from high-quality materials, it is built to withstand the harshest marine conditions, providing exceptional durability and consistent performance.. With the Yamaha Lower Unit Assy - 6GR-45300-04-CE, experience 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 dedication 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 This product has been superseded by: 6GR-45300-06-CE. 6GR-45300-04-CE - LOWER UNIT ASSY