Yamaha - Gear 2 - 6L2-45571-00-00Yamaha Gear 2 Lower Unit Drivetrain Component 6L2 45571 00 00 Overview When the second gear in the lower unit starts to wear, youll feel it in how the motor carries load and shifts under pressure. Its not always obvious at first, but over time it leads to noise and inconsistent performance. Ive seen setups where everything else looked fine, but this gear was the weak link. Replacing it brings the drivetrain back to smooth, reliable operation you can