Yamaha - Propeller Shaft - Lower Unit Drivetrain Component - 61B-45611-01-00

Overview

When a prop shaft starts to go, you’ll feel it before you see it—vibration, uneven spin, or even seals starting to leak. This shaft is what takes all that engine power and delivers it straight to the prop, so it has to stay perfectly straight and balanced under load. On these larger Yamaha setups, it’s a critical piece that takes constant stress every time you’re on the throttle. Swapping it out is one of those repairs that can smooth everything back out and prevent bigger issues inside the lower unit.

Key Features

• Direct Power Transfer Function – Connects the drivetrain to the propeller for steady thrust and performance.

• High-Strength Shaft Build – Designed to handle heavy torque loads in demanding marine conditions.

• Precision Machined Splines – Ensures secure propeller fitment and proper engagement under load.

• OEM Balance and Alignment – Built to Yamaha specifications for smooth rotation and reduced vibration.

Engine & Boat Compatibility

Compatible with select Yamaha high-horsepower outboard lower units, commonly used in V6 applications. Always verify fitment with your engine model and service manual.

FAQ

Q: What are signs a propeller shaft is damaged?
A: Vibration while running, wobble at the prop, leaking seals, or uneven wear are common signs.

Q: Can I run the boat with a slightly bent shaft?
A: It’s not recommended—running it can damage seals, bearings, and gears quickly.

Q: What usually causes shaft damage?
A: Most commonly from hitting debris, running aground, or heavy prop strikes.

Q: Is replacing this a major repair?
A: Yes, it requires full lower unit disassembly, so it’s usually done during a rebuild.

Q: Should I replace seals when installing a new shaft?
A: Definitely—it’s best to install new seals and inspect bearings to prevent future leaks.