Recreational outboards with simple maintenance and efficient performance. Mercury FourStroke engines were engineered to elevate every moment on the water — from portable tillers to 4.6L V8s.
- Advanced Range Optimisation (ARO)
- Maintenance-free valve train on many models
- Command Thrust gearcases for heavier boats
- SmartCraft® from 25hp: Active Trim, Troll Control, digital gauges
- Closed-loop fuel system and hydrodynamic gearcase
Models
| Model | Power | Displacement | Config | Notes |
|---|---|---|---|---|
| FourStroke 2.5 | 2.5 | — | Portable | Output far beyond its size |
| FourStroke 3.5 | 3.5 | — | Portable | — |
| FourStroke 4 | 4 | — | Portable | — |
| FourStroke 5 | 5 | — | Portable | — |
| FourStroke 6 | 6 | — | Portable | — |
| FourStroke 8 | 8 | — | Portable | — |
| FourStroke 9.9 | 9.9 | — | Portable / Command Thrust | — |
| FourStroke 15 | 15 | — | EFI | — |
| FourStroke 20 | 20 | — | EFI | — |
| FourStroke 25 | 25 | — | EFI | SmartCraft available |
| FourStroke 30 | 30 | — | EFI | — |
| FourStroke 40 | 40 | — | EFI / Command Thrust | Held to a higher standard |
| FourStroke 50 | 50 | — | EFI / Command Thrust | — |
| FourStroke 60 | 60 | — | EFI / Command Thrust | — |
| FourStroke 75 | 75 | 2.1L | In-line 4 | Embrace possibility |
| FourStroke 90 | 90 | 2.1L | In-line 4 / Command Thrust | — |
| FourStroke 115 | 115 | 2.1L | In-line 4 / Command Thrust | — |
| FourStroke 135 | 135 | — | In-line 4 | — |
| FourStroke 150 | 150 | — | In-line 4 | — |
| FourStroke 175 | 175 | 3.4L | V6 | 5000–5800 |
| FourStroke 200 | 200 | 3.4L | V6 | 5000–5800 |
| FourStroke 225 | 225 | 3.4L | V6 | 5200–6000 |
| FourStroke 250 | 250 | 4.6L | V8 | 5200–6000 |
| FourStroke 300 | 300 | 4.6L | V8 | 5200–6000 |