Listed gear-ratio data for 2005 Yamaha 40 HP outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2005 Yamaha 40 HP
Listed ratio values: 1.85:1, 2.00:1
| Model | Gear ratio |
|---|---|
| 40TLRD | 1.85:1 |
| F40MLHD | 2.00:1 |
| F40MSHD | 2.00:1 |
| F40TLRD | 2.00:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.