Yamaha - Lower Unit Assembly Gearcase Component 6EE-G5300-10-8D. Overview. The Yamaha Lower Unit Assembly 6EE-G5300-10-8D is what keeps your small outboard pushing smoothly through the water. On F4 and F6 motors, you'll notice right away when something's off-rough rotation, noise, or just not getting the performance you're used to. This assembly handles the full power transfer from engine to prop, so everything depends on it being tight and aligned. If your lower unit is worn or damaged, this is the kind of replacement that gets things running right again.. Key Features. • Efficient Power Transfer - Delivers engine output smoothly to the propeller for reliable operation.. • OEM Fit Precision - Built to Yamaha specifications for proper alignment and easy installation.. • Complete Gearcase Assembly - Pre-assembled unit for straightforward replacement and dependable performance.. • Corrosion-Resistant Construction - Designed to withstand harsh marine environments and long-term use.. Engin