Yamaha - Woodruff Key Flywheel & Shaft Alignment 90280-07036-00. Overview. This woodruff key is one of those parts that keeps everything timed and running the way it should, even though you rarely see it. It locks your flywheel or gear in place so nothing shifts when the engine's under load. I've seen motors act completely off just because this little piece was worn or slightly sheared. It's simple, but if it's not right, you'll feel it right away out on the water.. Key Features. Precise Timing Alignment - Keeps rotating components properly indexed for consistent engine performance.. Secure Locking Fit - Prevents slipping between shaft and connected parts under load.. High-Strength Construction - Built to handle torque and repeated engine cycles.. Exact Yamaha Fitment - Matches factory keyway dimensions for proper installation.. Engine & Boat Compatibility. Used across a wide range of Yamaha outboards in flywheel, crankshaft, and other keyed shaft applications. Essential for maintainin