Listed gear-ratio data for 1999 Yamaha 25 HP outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
1999 Yamaha 25 HP
Listed ratio values: 1.85:1, 2.08:1
| Model | Gear ratio |
|---|---|
| 25ELHX | 2.08:1 |
| 25ELRX | 2.08:1 |
| 25ESHX | 2.08:1 |
| 25MLHX | 2.08:1 |
| 25MLHX3 | 1.85:1 |
| 25MSHX | 2.08:1 |
| 25MSHX3 | 1.85:1 |
| F25ELHX | 2.08:1 |
| F25ELRX | 2.08:1 |
| F25ESHX | 2.08:1 |
| F25MLHX | 2.08:1 |
| F25MSHX | 2.08:1 |
| F25TLRX | 2.08:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.