Yamaha Lower Unit Assy - 6G1-45300-03-EK. The Yamaha Lower Unit Assy - 6G1-45300-03-EK is meticulously 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 the overall efficiency of your marine engine. Constructed from high-quality materials, it is built to withstand the toughest marine conditions, providing long-lasting durability and consistent performance.. With the Yamaha Lower Unit Assy - 6G1-45300-03-EK, experience smooth and efficient power transmission that minimizes drag and maximizes thrust. This leads to improved 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 performs at its peak in all conditions, delivering a reliable and enjoyable boating experience.. This product has been superseded by: 6M8-G5300-00-EK. 6G1-45300-03-EK - LOWER UNI