Yamaha Crankshaft Gear YF1-58412-41-10. Overview. The Yamaha YF1-58412-41-10 Crankshaft Gear is a genuine original equipment manufacturer component designed to transfer rotational motion from the crankshaft to other critical engine components. This gear plays an essential role in maintaining proper mechanical timing and ensuring smooth operation of connected systems within the engine.. Precise gear engagement is critical for reliable engine performance and efficiency. Over time, gears may wear d