Yamaha Lower Unit Assembly - F4 - F6 - 6EE-G5300-10-4D - See Description for Applicable ModelsYamaha Lower Unit Assembly Gearcase & Propulsion System 6EE G5300 10 4D Overview When a small motor like an F4 or F6 starts losing smoothness or making noise down low, its usually the lower unit telling you somethings off. Ive worked on plenty of these smaller Yamahas, and swapping in a complete assembly is often the cleanest fix. It saves time and gets everything back in line without chasing individual parts. Once its on, the motor runs quiet and