Yamaha - Gear 2 Engine Drive Component YF1-49586-32-70. Overview. Inside a Yamaha engine, gears like this are what keep everything timed and moving together. I've worked on motors where a worn gear caused noise, rough operation, or even bigger internal issues if left too long. The Yamaha Gear 2 YF1-49586-32-70 is built to mesh cleanly and keep rotation smooth under load. When it's in good shape, the engine runs quieter, tighter, and the way it's supposed to.. Key Features. • Precision Gear Engagement - Ensures smooth interaction with mating gears for consistent operation.. • Yamaha Engineered Fit - Built to exact specifications for proper alignment and performance.. • High-Strength Construction - Designed to handle continuous rotational forces and engine stress.. • Supports Internal Timing Accuracy - Helps maintain synchronized movement of engine components.. • Direct Replacement Gear - Installs in place of the original component during service or rebuild.. Engine & Boat Compatibility.