Yamaha - Woodruff Key - Shaft Alignment Component - 6H4-11545-00-00

Overview

This is one of those tiny parts that can cause big problems if it’s not right. I’ve seen motors lose timing or components slip just because a worn or sheared key was overlooked. It’s what locks rotating parts together so everything stays in sync under load. When it’s seated properly, you never think about it—but it’s doing its job every second the engine runs.

Key Features

• Positive Shaft Locking – Secures rotating components in place to prevent slipping under load.
• Precision Fit Design – Matches Yamaha specifications for proper seating and alignment.
• Hardened Metal Construction – Built to handle torque and resist wear over time.
• Maintains Component Timing – Helps ensure correct positioning of connected engine parts.
• Essential Internal Part – Critical for reliable operation of key rotating assemblies.

Engine & Boat Compatibility

Designed for Yamaha outboards with compatible internal shaft and rotating component assemblies. Commonly used across a wide range of small to mid-size engines found on fishing boats, skiffs, and recreational vessels. Always verify compatibility with your specific engine before installation.

FAQ

Q: What happens if a woodruff key fails?
A: Components can slip out of position, leading to poor performance or potential engine damage.

Q: What are signs this part is worn or damaged?
A: Difficulty holding alignment, unusual movement, or visible wear when inspected.

Q: Is installation difficult?
A: Not usually, but it needs to be properly seated to ensure correct alignment.

Q: Can this part be reused?
A: It’s best to replace it if there’s any sign of wear or deformation.

Q: Should I replace this during other repairs?
A: Yes, especially if you’re already working on the connected components—it’s a simple and smart replacement.