Yamaha - Gear 1 assy - 6J8-45560-00-00Yamaha Gear 1 Assembly Drivetrain Component 6J8 45560 00 00 Overview The Yamaha Gear 1 Assembly 6J8 45560 00 00 is one of those internal parts that keeps your lower unit running smooth every time you drop it in gear. When gears start to wear, youll hear it right awaynoise, vibration, or that rough feel under load. This assembly handles a big part of the power transfer, so it needs to stay tight and properly aligned. If youre already inside the