Listed gear-ratio data for 2019 Yamaha 90 HP outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2019 Yamaha 90 HP
Listed ratio values: 2.15:1, 2.27:1
| Model | Gear ratio |
|---|---|
| F90LB | 2.27:1 |
| F90XB | 2.27:1 |
| VF90LA | 2.15:1 |
| VF90XA | 2.15:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.