Yamaha - Drive Sprocket Drivetrain Component 7YA-17491-09-00. Overview. You can usually tell when a sprocket's starting to go-things get a little rough, a little noisy, and power just doesn't transfer as clean. I've replaced plenty where the issue only showed up once the engine was under load. The Yamaha Drive Sprocket 7YA-17491-09-00 brings that smooth engagement back so everything runs the way it should. It's one of those parts that keeps the whole system feeling tight and responsive.. Key Features. • Smooth Power Transfer - Ensures consistent engagement between chain and drivetrain components.. • Precision Yamaha Fitment - Built to exact specifications for proper alignment.. • Reduces Drivetrain Wear - Helps minimize stress on chain and related parts.. • Durable Metal Construction - Designed to handle continuous load and friction.. • Direct Replacement Design - Installs using standard factory mounting points.. Engine & Boat Compatibility. The Yamaha Drive Sprocket 7YA-17491-09-00 is