Yamaha - Gear - 6L2-45560-10-00Yamaha Gear Lower Unit Drivetrain Component 6L2 45560 10 00 Overview When gears inside the lower unit start wearing down, youll notice it right awaynoise, rough engagement, or slipping under load. This is one of those parts that takes constant stress every time you run the motor. Ive worked on plenty of units where a worn gear was the root of the problem. Replacing it brings things back to smooth, solid operation and helps avoid bigger damage down the