Listed gear-ratio data for 2015 Yamaha 25 HP outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2015 Yamaha 25 HP
Listed ratio values: 2.08:1, 2.42:1
| Model | Gear ratio |
|---|---|
| F25LA | 2.08:1 |
| F25LEA | 2.08:1 |
| F25LEHB | 2.08:1 |
| F25LMHB | 2.08:1 |
| F25SEA | 2.08:1 |
| F25SEHA | 2.08:1 |
| F25SMHA | 2.08:1 |
| T25LA | 2.42:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.