Yamaha - Propeller Shaft - Lower Unit Drivetrain Component - 61B-45611-20-00

Overview

When a prop shaft gets bent or worn, it doesn’t take long before you feel it—vibration, uneven spin, or even seal issues starting to show up. This shaft is what transfers all that engine power straight to the prop, so it has to stay true and balanced under load. On bigger Yamaha motors, especially in that V6 range, this part takes a beating over time. Swapping it out is one of those repairs that can completely smooth things back out and protect the rest of your lower unit from further damage.

Key Features

• Direct Power Transfer Role – Connects the drivetrain to the propeller for consistent thrust and performance.

• High-Strength Shaft Design – Built to handle heavy torque loads common in larger outboards.

• Precision Machined Splines – Ensures proper prop fitment and secure engagement during operation.

• OEM Balance and Alignment – Designed to run true within the gearcase to reduce vibration and wear.

Engine & Boat Compatibility

Compatible with select Yamaha high-horsepower outboard lower units, commonly used in 225 HP and 250 HP V6 models. Always verify fitment with your engine model and service manual.

FAQ

Q: What are signs of a damaged propeller shaft?
A: Vibration while running, uneven prop rotation, leaking seals, or visible wobble are common signs.

Q: Can a bent shaft damage other parts?
A: Yes, it can wear out seals, bearings, and gears if not replaced quickly.

Q: How does a prop shaft usually get damaged?
A: Most often from hitting submerged objects or running aground.

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

Q: Should I check anything else when replacing it?
A: Definitely inspect seals, bearings, and gears to avoid repeat issues.