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 t