Yamaha - Woodruff Key - Flywheel & Shaft Alignment - 90280-05025-00

Overview

This woodruff key is one of those parts you don’t give much thought to until something slips out of sync. It’s what keeps critical components locked in position so your engine timing stays right where it should be. I’ve run into plenty of cases where a worn key caused rough running or no start at all. It’s a simple piece, but it carries a lot of responsibility every time the engine turns.

Key Features

• Accurate Shaft Alignment – Keeps rotating components properly indexed for consistent timing.

• Slip-Resistant Fit – Prevents movement between mating parts under load.

• High-Strength Material – Built to handle engine torque and repeated use.

• OEM-Spec Dimensions – Matches Yamaha sizing for a precise and secure fit.

Engine & Boat Compatibility

Used across a wide range of Yamaha outboards in applications involving flywheels, crankshafts, and other keyed shaft components. Essential for maintaining proper alignment and timing in engine assemblies. Always confirm correct size and application before installation.

FAQ

Q: What are common signs this key needs replacing?
A: Look for timing issues, slipping components, or the engine not starting properly.

Q: Can I install this without special tools?
A: Basic tools usually work, but careful placement is important to avoid damaging it.

Q: Should I replace it if I’m already removing the flywheel?
A: Yes, it’s a good idea—especially if there’s any sign of wear.

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

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