Yamaha Gear 2 (1.969 Ratio) 6T5-4588E-30-00. Overview. The Yamaha Gear 2 (1.969 Ratio) 6T5-4588E-30-00 is a genuine original equipment manufacturer component designed to deliver precise motion transfer and optimized performance within your Yamaha system. With a 1.969 gear ratio, this component is engineered to provide increased torque output while maintaining controlled speed, ensuring smooth and efficient operation.. Manufactured to Yamaha's exact specifications, this gear offers a precise fit