Listed gear-ratio data for 2003 Yamaha 4 HP outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2003 Yamaha 4 HP
Listed ratio values: 2.08:1
| Model | Gear ratio |
|---|---|
| F4MLHB | 2.08:1 |
| F4MSHB | 2.08:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.