Yamaha - Gear 1 (28t) - 6EH-45560-00-00Yamaha Gear 1 (28 Tooth) Lower Unit Gear Train 6EH 45560 00 00 Overview When youre dealing with lower unit gears, even small wear shows up fast on the water. Ive opened up gearcases where one worn gear turned into noise, vibration, and eventually bigger damage. This gear is part of that chain that keeps power moving clean from the engine to the prop. When its in good shape, everything runs quiet and smooth like you expect from a Yamaha. Key Features