Yamaha - Woodruff Key - Flywheel & Shaft Alignment - 90280-03024-00

Overview

This woodruff key is one of those parts that keeps everything lined up and running right without much attention. It locks components like the flywheel into position so your engine timing stays consistent. I’ve seen engines run rough or lose timing just because this piece was worn or slightly sheared. It’s a simple part, but it plays a big role every time you fire up the motor.

Key Features

• Precise Alignment Support – Keeps rotating components properly indexed for accurate engine timing.

• Secure Anti-Slip Fit – Prevents movement between shaft and connected parts under load.

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

• 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 timing and rotational accuracy are critical. Always confirm correct sizing and application before installation.

FAQ

Q: What are the signs of a failing woodruff key?
A: You might notice timing issues, rough engine performance, or the motor not starting.

Q: Can I reuse a woodruff key if it looks fine?
A: It’s best to replace it—small wear isn’t always visible but can still cause problems.

Q: Does installing this require removing the flywheel?
A: In most cases, yes, you’ll need access to the shaft to install it properly.

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

Q: What usually causes a woodruff key to fail?
A: Improper torque, sudden impact, or components slipping out of alignment are common causes.

• Supersessions
  90280-03003-00