Yamaha - Woodruff Key - Flywheel & Shaft Alignment - 90280-04002-00

Overview

This woodruff key is one of those pieces that quietly keeps everything in sync inside your engine. It holds components in the exact position they need to be so timing stays consistent every time you fire up. I’ve seen engines act completely off just because this small part was worn or slightly out of place. It’s not complicated, but it’s absolutely essential if you want things running the way they should.

Key Features

• Precise Component Alignment – Keeps flywheel and shaft components correctly positioned for proper timing.

• Secure Locking Fit – Prevents slipping between connected parts during operation.

• Strong Metal Construction – Built to handle torque and continuous engine use.

• Yamaha-Specific Fitment – Designed to match factory tolerances for dependable installation.

Engine & Boat Compatibility

Commonly used across Yamaha outboards in flywheel, crankshaft, and other keyed shaft applications. Essential for maintaining alignment in systems where timing and rotational accuracy are critical. Always verify correct size and fit before installation.

FAQ

Q: What are the symptoms of a damaged woodruff key?
A: You may notice poor engine timing, reduced power, or the engine not starting at all.

Q: Can I install this without replacing other parts?
A: Yes, as long as the shaft and mating components are still in good condition.

Q: Does this part require any adjustment after installation?
A: No adjustments needed, just make sure it’s properly seated and aligned.

Q: How does saltwater exposure affect it?
A: Over time it can lead to corrosion, so clean installation and maintenance matter.

Q: What should I check before installing a new key?
A: Make sure the keyway slot and mating surfaces are clean and not worn or damaged.