Mercury 4-6 HP Fourstroke Outboard
![]() | Convenience Has Never Been So CleverNever before has portable power seemed so perfect. Notorious for their user-friendly features like full forward and reverse shifting, our 4, 5 and 6hp FourStrokes also offers through-prop exhaust that buries the sound underwater for quieter operation and a decompression system that allows for quick and effortless one-hand starting. Plus, our 4 hp model raises the bar with an integrated fuel tank with shutoff.
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Mercury FourStroke Outboards | 4 HP | 5 HP | 6 HP |
| HP @ Prop | 4 | 5 | 6 |
| kW @ Prop | 2.9 | 3.7 | 4.4 |
| Max RPM (WOT) | 4500-5500 | 4500-5500 | 5000-6000 |
| Cylinders | 1 | 1 | 1 |
| Displacement (CID/cc) | 7.5 / 123 | 7.5 / 123 | 7.5 / 123 |
| Bore & Stroke (in) | 2.32 x 1.77 | 2.32 x 1.77 | 2.32 x 1.77 |
| Bore & Stroke (mm) | 59 x 45 | 59 x 45 | 59 x 45 |
| Cooling System | Water-cooled w/thermostat | Water-cooled w/thermostat | Water-cooled w/thermostat |
| Ignition System | CDI | CDI w/electric spark advance | CDI w/electric spark advance |
| Starting | Manual | Manual | Manual |
| Gear Ratio | 2.15:1 | 2.15:1 | 2.15:1 |
| Gear Shift | F-N-R | F-N-R | F-N-R |
| Steering | Tiller | Tiller | Tiller |
| Alternator Amp | Optional 4-amp lighting / 2-amp charging | Optional 4-amp lighting / 2-amp charging | Optional 4-amp lighting / 2-amp charging |
| Alternator Watt | Optional 50-watt lighting / 25-watt charging | Optional 50-watt lighting / 25-watt charging | Optional 50-watt lighting / 25-watt charging |
| Trim & Tilt System | 6 | 6 | 6 |
| Shallow Water Drive | Standard | Standard | Standard |
| Exhaust System | Through prop | Through prop | Through prop |
| Lubrication System | Pressurized wet sump | Pressurized wet sump | Wet sump |
| Recommended Oil | Mercury 4-Stroke Outboard Oil | Mercury 4-Stroke Outboard Oil | Mercury 4-Stroke Outboard Oil |
| Oil Capacity | 450 mL / 15 oz | 450 mL / 15 oz | 450 mL / 15 oz |
| Fuel Induction System | 2-valve pushrod | 2-valve pushrod | 2-valve pushrod |
| Remote Fuel Tank (US Gal) | 0.39 (remote 3.2 Gal. optional) | 3.2 standard | 3.2 standard |
| Remote Fuel Tank (L) | 1.1 (remote 12L optional) | 12L | 12L |
| Shaft Length (inches) | 15 / 20 | 15 / 20 | 15 / 20 |
| Shaft Length (mm) | 381 / 508 | 381 / 508 | 381 / 508 |
| Dry Weight (lbs.) | 55 | 55 | 55 |
| Dry Weight (kg) | 25 | 25 | 25 |
| Operator Warning System | Low oil pressure | Low oil pressure | Overheat |
| Available Propellers | Consult propeller guide | Consult propeller guide | Consult propeller guide |
| CARB Star Rating | N/A | N/A | 3 |
| Warranty | 3 years | 3 years | 3 years |
| Corrosion Warranty | 3 years | 3 years | - |




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