Yamaha - Woodruff Key Flywheel & Shaft Alignment 90280-03006-00. Overview. This woodruff key is one of those small parts that quietly keeps your engine in line every time it runs. It holds components like the flywheel exactly where they need to be so timing stays consistent. I've seen engines act completely off just because this key was worn down or slightly sheared. It's not complicated, but it's critical for keeping everything turning together the right way.. Key Features. Precise Timing Support - Keeps rotating components aligned for consistent engine timing.. Secure Shaft Locking - Prevents slipping between the shaft and connected parts.. Durable Metal Design - Built to handle engine torque and long-term use.. Exact Factory Fit - Matches Yamaha specifications for proper installation and performance.. Engine & Boat Compatibility. Used across a range of Yamaha outboards in flywheel, crankshaft, and other keyed shaft applications. Essential for maintaining proper alignment in systems