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 wher