Yamaha - Woodruff Key - Flywheel & Shaft Alignment - 90280-05014-00

Overview

This woodruff key is one of those small parts that keeps your engine running true without you ever noticing it—until something goes wrong. It holds key components in place so timing stays locked in every time the motor turns over. I’ve run into engines with rough idle or no start that traced right back to a worn or sheared key. It’s simple, but it’s doing a critical job every second you’re on the water.

Key Features

• Precise Timing Alignment – Keeps flywheel and shaft components properly indexed for consistent engine timing.

• Secure Locking Fit – Prevents slipping between mating parts under load.

• Durable Metal Construction – Built to handle torque and repeated engine cycles.

• Exact Yamaha Fitment – Matches factory keyway dimensions for a clean, reliable install.

Engine & Boat Compatibility

Commonly used across Yamaha outboards in flywheel, crankshaft, and other keyed shaft applications. Supports systems where accurate alignment is critical for proper timing and smooth engine operation. Always verify correct sizing and application before installation.

FAQ

Q: What are the signs this woodruff key is going bad?
A: You might notice timing issues, engine misfires, or the motor not starting at all.

Q: Can a damaged key affect performance even if the engine runs?
A: Yes, it can throw off timing just enough to reduce efficiency and power.

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

Q: How tight should the key fit in the slot?
A: It should sit snug and flush without rocking or sticking out unevenly.

Q: What causes a woodruff key to shear?
A: Usually improper torque, sudden impact, or components slipping under load.

• Supersessions
  322-11545-00-00