Yamaha - Flyweight Shaft Gear Engine Timing Component 7FK-11972-01-00. Overview. This is one of those internal parts you don't see often, but when it's worn, the engine won't feel right. The flyweight shaft gear plays a role in timing and mechanical movement inside the powerhead, so everything needs to stay in sync. I've come across engines with odd timing behavior that traced back to worn or damaged gears like this. When it's in good shape, the motor runs smooth and predictable like it should.. Key Features. • Precise Gear Engagement - Ensures accurate interaction with connected components for proper engine timing.• Durable Metal Construction - Built to handle constant rotation, load, and internal engine stress.• OEM Machined Fit - Designed to match factory tolerances for smooth operation without binding.• Supports Engine Synchronization - Helps maintain consistent mechanical timing within the engine system.. Engine & Boat Compatibility. Designed for Yamaha outboard engines that utili