Yamaha - Gear 2 assy - 6K1-45570-20-00Yamaha Gear 2 Assembly Drivetrain Component 6K1 45570 20 00 Overview The Yamaha Gear 2 Assembly 6K1 45570 20 00 is one of those internal parts that keeps your lower unit running quiet and smooth when everythings right. Once gears start wearing out, youll hear it firstthen feel it under load. This assembly handles a big part of the power transfer inside the gearcase, so it needs to stay tight and properly matched. If youre already opening up the lower