Yamaha - Woodruff Key - Flywheel & Shaft Alignment - 90280-07055-00

Overview

This is one of those small parts that can cause big problems if it’s off or worn out. The woodruff key keeps your rotating components lined up exactly where they need to be, especially around the flywheel. I’ve come across plenty of engines with timing issues that traced back to a damaged or missing key. It’s simple, but it’s critical for keeping everything running true.

Key Features

• Accurate Shaft Positioning – Keeps components properly aligned to maintain correct timing.

• Slip Prevention Design – Locks mating parts in place under load to avoid movement.

• Heavy-Duty Metal Build – Handles engine torque and repeated use without deforming easily.

• Factory-Matched Dimensions – Designed to fit Yamaha components without guesswork.

Engine & Boat Compatibility

Commonly used across Yamaha outboards in flywheel and crankshaft applications where precise alignment is required. Fits systems that depend on keyed shafts to maintain correct timing and rotation. Always verify size and fitment before installation.

FAQ

Q: What are the signs of a worn or damaged woodruff key?
A: You might notice rough running, timing issues, or even a no-start condition.

Q: Can a bad key damage other engine parts?
A: Yes, it can cause the flywheel or other components to slip, which may lead to further wear or damage.

Q: Do I need any special tools to install it?
A: Not usually, but a proper puller and careful seating are important to avoid damaging it.

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

Q: Should I replace it during routine maintenance?
A: If you’re already in there and see any wear, it’s a smart move to replace it.