Listed gear-ratio data for 2025 Yamaha 20 HP outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2025 Yamaha 20 HP
Listed ratio values: 2.08:1
| Model | Gear ratio |
|---|---|
| F20LMHB | 2.08:1 |
| F20LWB | 2.08:1 |
| F20LWHB | 2.08:1 |
| F20LWPB | 2.08:1 |
| F20LWPHB | 2.08:1 |
| F20SMHB | 2.08:1 |
| F20SWB | 2.08:1 |
| F20SWHB | 2.08:1 |
| F20SWPB | 2.08:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.