Listed gear-ratio data for 2005 Evinrude 9.9 HP outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2005 Evinrude 9.9 HP
Listed ratio values: 2.42:1
| Model | Gear ratio |
|---|---|
| 9.9 HP 2-Stroke | 2.42:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.