Yamaha - Gear 2 - 6E5-45571-01-00Yamaha Gear 2 Lower Unit Drivetrain 6E5 45571 01 00 Overview When youre dealing with lower unit performance, gears are right at the center of it all. This gear takes constant load every time youre on the throttle, and once it starts to wear, youll feel it through noise or rough operation. Ive seen setups where one worn gear ends up affecting the whole drivetrain. Replacing it helps bring everything back to smooth, reliable power transfer. Key Features