Yamaha - Woodruff Key - Flywheel & Shaft Alignment - 90280-07036-00

Overview

This woodruff key is one of those parts that keeps everything timed and running the way it should, even though you rarely see it. It locks your flywheel or gear in place so nothing shifts when the engine’s under load. I’ve seen motors act completely off just because this little piece was worn or slightly sheared. It’s simple, but if it’s not right, you’ll feel it right away out on the water.

Key Features

• Precise Timing Alignment – Keeps rotating components properly indexed for consistent engine performance.

• Secure Locking Fit – Prevents slipping between shaft and connected parts under load.

• High-Strength Construction – Built to handle torque and repeated engine cycles.

• Exact Yamaha Fitment – Matches factory keyway dimensions for proper installation.

Engine & Boat Compatibility

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

FAQ

Q: What are signs this woodruff key is starting to fail?
A: You might notice rough running, timing issues, or the engine struggling to start.

Q: Can a slightly damaged key still cause problems?
A: Yes, even minor wear can throw off alignment enough to affect performance.

Q: Do I need to replace it every time I remove the flywheel?
A: Not always, but if there’s any sign of wear, it’s best to replace it.

Q: How should it sit once installed?
A: It should be snug and flush in the keyway without rocking or sticking out unevenly.

Q: What’s the most common installation mistake?
A: Not seating it fully or forcing it in at an angle, which can lead to early failure.