Yamaha Gear 2 (1.841:1 Ratio) 6T5-4588E-20-00. Overview. The Yamaha Gear 2 (1.841:1 Ratio) 6T5-4588E-20-00 is a genuine original equipment manufacturer component designed to deliver precise motion transfer and optimized performance within your Yamaha system. With a 1.841:1 ratio, this gear is engineered to provide enhanced torque while maintaining efficient speed control, ensuring smooth and reliable operation.. Built to Yamaha's exact specifications, this gear offers a precise fit and dependabl