Yamaha - Balance Gear Engine Balance System YF1-49212-64-62. Overview. Balance gears are one of those parts you don't think about until the engine starts feeling rough or noisy. I've seen Yamahas come in with vibration issues that traced back to worn or misaligned balance components. The Yamaha Balance Gear YF1-49212-64-62 helps keep engine rotation smooth by countering internal movement. When it's doing its job, the engine runs quieter and feels a lot more refined.. Key Features. • Reduces Engine Vibration - Helps balance internal engine movement for smoother operation.. • Precision Gear Engagement - Designed for accurate meshing with mating gears.. • Yamaha Engineered Fit - Built to factory specifications for proper timing and alignment.. • High-Strength Construction - Handles continuous rotational forces and engine stress.. • Direct Replacement Gear - Fits in place of the original component during engine service.. Engine & Boat Compatibility. The Yamaha Balance Gear YF1-49212-64-62