Yamaha Woodruff Key YA0-05320-54-01. Overview. The Yamaha Woodruff Key YA0-05320-54-01 is a genuine original equipment manufacturer component designed to secure and align rotating engine parts. This small yet critical part ensures proper positioning between shafts and connected components, allowing for smooth power transfer and reliable mechanical operation.. Woodruff keys are essential for preventing slippage between components such as flywheels, gears, or pulleys. Over time, keys can become wo