Yamaha - Driven Sprocket Drivetrain Component 93811-12009-00. Overview. When the driven sprocket starts wearing down, you'll notice it in how the whole system feels-less smooth, more noise, and uneven power delivery. I've seen setups where the drive sprocket looked fine, but the driven side was the real issue. The Yamaha Driven Sprocket 93811-12009-00 helps keep everything in sync so power transfers clean from start to finish. It's one of those parts that keeps your drivetrain balanced and working like it should.. Key Features. • Balanced Power Transfer - Works with the drive sprocket to maintain smooth drivetrain operation.. • Precision Tooth Alignment - Ensures proper chain engagement and reduces wear.. • Yamaha Engineered Fit - Built to match original specifications and mounting points.. • Supports Drivetrain Stability - Helps maintain consistent performance under load.. • Durable Metal Construction - Designed to handle friction, load, and long-term use.. Engine & Boat Compatibility