Listed gear-ratio data for 2017 Yamaha 2.5 HP outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2017 Yamaha 2.5 HP
Listed ratio values: 2.01:1
| Model | Gear ratio |
|---|---|
| F2.5LMHB | 2.01:1 |
| F2.5SMHB | 2.01:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.