Yamaha - Shaft, propeller - 68T-45611-00-00Yamaha Propeller Shaft Lower Unit Drivetrain Component 68T 45611 00 00 Overview The prop shaft is one of those parts that quietly takes a beating every time you throttle up. Its transferring all that engine power straight to the prop, so it needs to stay true and strong no matter how hard you run it. When one of these gets even slightly bent or worn, youll feel it in the water right awayvibration, noise, or inconsistent performance. This is the kind