Listed gear-ratio data for 1999 Yamaha 80 HP outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
1999 Yamaha 80 HP
Listed ratio values: 2.31:1
| Model | Gear ratio |
|---|---|
| F80TLRX | 2.31:1 |
| F80TXRX | 2.31:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.