Yamaha - Propeller Shaft Lower Unit Drivetrain 6E5-45611-01-00. Overview. When something feels off at the prop, the shaft is always worth a closer look. It takes all the engine's power and transfers it straight to the prop, so any bend or wear shows up fast on the water. I've seen even a slight tweak cause vibration or uneven performance that just doesn't go away. Replacing it gets everything spinning true again and brings back that smooth, solid feel you expect.. Key Features. Straight Power Transfer - Delivers engine output directly to the propeller with minimal loss.. Hardened Steel Construction - Built to handle torque, load, and constant rotation under pressure.. Precision Machined Fit - Ensures proper alignment within the lower unit for smooth operation.. OEM Replacement Design - Matches original specifications for dependable installation and function.. Engine & Boat Compatibility. Designed for Yamaha 2-stroke outboard engines with standard lower unit gearcases. Commonly used on