Yamaha - Woodruff Key - Flywheel & Shaft Alignment - 90280-03006-00

Overview

This woodruff key is one of those small parts that quietly keeps your engine in line every time it runs. It holds components like the flywheel exactly where they need to be so timing stays consistent. I’ve seen engines act completely off just because this key was worn down or slightly sheared. It’s not complicated, but it’s critical for keeping everything turning together the right way.

Key Features

• Precise Timing Support – Keeps rotating components aligned for consistent engine timing.

• Secure Shaft Locking – Prevents slipping between the shaft and connected parts.

• Durable Metal Design – Built to handle engine torque and long-term use.

• Exact Factory Fit – Matches Yamaha specifications for proper installation and performance.

Engine & Boat Compatibility

Used across a range of Yamaha outboards in flywheel, crankshaft, and other keyed shaft applications. Essential for maintaining proper alignment in systems where timing and rotational accuracy are critical. Always verify correct sizing and fitment before installation.

FAQ

Q: What happens if this woodruff key fails?
A: You’ll likely see timing issues, rough running, or the engine may not start at all.

Q: Can I install this without removing major components?
A: Usually not—you’ll typically need to remove the flywheel or the part it’s indexing.

Q: Should it be tight in the keyway?
A: Yes, it should sit snug and flush without rocking or sticking out unevenly.

Q: Is corrosion something to worry about?
A: Over time, especially in saltwater, it can be—clean installs help prevent that.

Q: What’s a common mistake during installation?
A: Not seating it fully or forcing it into place, which can cause it to fail quickly.