FourStroke 2.5-20 HP
Introducing the Mercury FourStroke. Put amazing power in the palm of your hand. These compact outboard motors take you to the fun, the fish, or whatever floats your boat – quickly and reliably.
Enjoy quick acceleration to go with exhilarating speed. Easy to install and operate, with reliable starting, low vibration, and instant throttle response. It’s worry-free boating at its best.
Specifications
2.5 HP
Weighing in at just 38 pounds, this compact, reliable motor is a great choice for aluminum tiller, inflatable soft hull, jon, utility, and sail boats.
| HP / kW | 2.5 / 1.9 |
| Engine type | 1 cylinder |
| Displacement (CID/CC) | 5.2 / 85 |
| Full throttle RPM | 4500-5500 |
| Fuel induction system | 2-valve pushrod (overhead valve) |
| Recommended fuel | 87 octane compatible (up to 10% ethanol) |
| Recommended oil | Mercury FourStroke Oil 10W-30 |
| Engine protection operator warning system | Over-rev |
| Starting | Manual |
| Steering | Tiller with 360° turning |
| Shaft length | 15″ / 381 mm |
| Gearcase ratio | 2.15:1 |
| Dry weight *Lightest model available | 41 lbs / 18 kg |
| CARB star rating | 3 |
| Bore and stroke | 2.16 x 1.42″ / 55 x 36 mm |
| Ignition | CDI w/electronic spark advance |
| Fuel system | Carbureted |
| Cooling system | Water-cooled with thermostat |
| Gear shift | F-N |
| Gearcase options | Standard |
| Trim system | 4 position |
| Trim positions | 4 |
| Exhaust system | Above prop |
| Shallow water trim range (degrees) | 16 |
| Integrated fuel tank (gal / L) | 0.3 / 1.1 |
| Color | Phantom Black |
3.5 HP
Delivers lightweight, portable power and thrust for exact operation. Perfect for aluminum tiller, inflatable soft hull, jon, utility, and sail boats.
| HP / kW | 3.5 / 2.6 |
| Engine type | 1 cylinder |
| Displacement (CID/CC) | 5.2 / 85 |
| Full throttle RPM | 5000-6000 |
| Fuel induction system | 2-valve pushrod (overhead valve) |
| Recommended fuel | 87 octane / up to 10% ethanol |
| Recommended oil | Mercury FourStroke Oil 10W-30 |
| Engine protection operator warning system | Over-rev |
| Starting | Manual |
| Steering | Tiller with 360° turning |
| Shaft length | 15″ / 381 mm |
| 20″ / 508 mm | |
| Gearcase ratio | 2.15:1 |
| Dry weight *Lightest model available | 41 lbs / 18 kg |
| CARB star rating | 3 |
| Bore and stroke | 2.16 x 1.42″ / 55 x 36 mm |
| Ignition | CDI w/electronic spark advance |
| Fuel system | Carbureted |
| Cooling system | Water-cooled with thermostat |
| Gear shift | F-N |
| Gearcase options | Standard |
| Trim system | 4 position |
| Trim positions | 4 |
| Exhaust system | Above prop |
| Shallow water trim range (degrees) | 16 |
| Integrated fuel tank (gal / L) | 0.3 / 1.1 |
| Color | Phantom Black |
4 HP
This lightweight motor features through-prop exhaust for extra-quiet operation. Great for aluminum tiller, inflatable soft hull, jon, utility, and sail boats.
| HP / kW | 4 / 2.9 |
| Engine type | 1 cylinder |
| Displacement (CID/CC) | 7.5 / 123 |
| Full throttle RPM | 4500-5500 |
| Fuel induction system | 2-valve pushrod (overhead valve) |
| Recommended fuel | 87 octane / up to 10% ethanol |
| Recommended oil | Mercury FourStroke Oil 10W-30 |
| Engine protection operator warning system | Low oil pressure |
| Over-rev | |
| Starting | Manual |
| Steering | Tiller |
| Shaft length | 15″ / 381 mm |
| 20″ / 508 mm | |
| Gearcase ratio | 2.15:1 |
| Dry weight *Lightest model available | 57 lbs / 26 kg |
| CARB star rating | 3 |
| Bore and stroke | 2.32 x 1.77″ / 59 x 45 mm |
| Ignition | CDI w/electronic spark advance |
| Fuel system | Carbureted |
| Cooling system | Water-cooled with thermostat |
| Gear shift | F-N-R |
| Gearcase options | Standard |
| Trim positions | 6 |
| Exhaust system | Through prop |
| Shallow water drive | Yes |
| Shallow water trim range (degrees) | 16 |
| Integrated fuel tank (gal / L) | 0.3 / 1.1 |
| Optional fuel tank (gal / L) | 3.2 / 12 |
| Color | Phantom Black |
5 HP Sail Power
| Engineered to meet the unique needs of sailboat enthusiasts. Also great for aluminum tiller, inflatable soft hull, jon, and utility boats. |
| HP / kW | 5 / 3.7 |
| Engine type | 1 cylinder |
| Displacement (CID/CC) | 7.5 / 123 |
| Full throttle RPM | 4500-5500 |
| Fuel induction system | 2-valve pushrod (overhead valve) |
| Alternator amp / Watt | 4 amp / 50 watt lighting and charging |
| Recommended fuel | 87 octane / up to 10% ethanol |
| Recommended oil | Mercury FourStroke Oil 10W-30 |
| Engine protection operator warning system | Low oil pressure |
| Over-rev | |
| Starting | Manual |
| Steering | Tiller |
| Shaft length | 20″ / 508 mm |
| Gearcase ratio | 2.15:1 |
| Dry weight *Lightest model available | 59 lbs / 27 kg |
| CARB star rating | 3 |
| Bore and stroke | 2.32 x 1.77″ / 59 x 45 mm |
| Ignition | CDI w/electronic spark advance |
| Fuel system | Carbureted |
| Cooling system | Water-cooled with thermostat |
| Gear shift | F-N-R |
| Gearcase options | Sail Power |
| Trim positions | 6 |
| Exhaust system | Through prop |
| Shallow water drive | Yes |
| Shallow water trim range (degrees) | 16 |
| Integrated fuel tank (gal / L) | 0.3 / 1.1 |
| Optional fuel tank (gal / L) | 3.2 / 12 |
| Color | Phantom Black |
5 HP
Multiple trim positions to enhance performance and enable shallow-water operation. Through-prop exhaust makes it extra quiet. Lightweight: just 57 pounds. Great for aluminum tiller, inflatable soft hull, jon, utility, and sail boats.
| HP / kW | 5 / 3.7 |
| Engine type | 1 cylinder |
| Displacement (CID/CC) | 7.5 / 123 |
| Full throttle RPM | 4500-5500 |
| Fuel induction system | 2-valve pushrod (overhead valve) |
| Recommended fuel | 87 octane / up to 10% ethanol |
| Recommended oil | Mercury FourStroke Oil 10W-30 |
| Engine protection operator warning system | Low oil pressure |
| Over-rev | |
| Starting | Manual |
| Steering | Tiller |
| Shaft length | 15″ / 381 mm |
| 25″ / 635 mm | |
| Gearcase ratio | 2.15:1 |
| Dry weight *Lightest model available | 57 lbs / 26 kg |
| CARB star rating | 3 |
| Bore and stroke | 2.32 x 1.77″ / 59 x 45 mm |
| Ignition | CDI w/electronic spark advance |
| Fuel system | Carbureted |
| Cooling system | Water-cooled with thermostat |
| Gear shift | F-N-R |
| Gearcase options | Standard |
| Trim positions | 6 |
| Exhaust system | Through prop |
| Shallow water drive | Yes |
| Shallow water trim range (degrees) | 16 |
| Integrated fuel tank (gal / L) | 0.3 / 1.1 |
| Optional fuel tank (gal / L) | 3.2 / 12 |
| Color | Phantom Black |
6 HP
Feature integral fuel tanks with an external fuel-shutoff valve. For extended range, they can also be connected to a remote fuel tank. Great for aluminum tiller, inflatable soft hull, jon, utility, and sail boats.
| HP / kW | 6 / 4.4 |
| Engine type | 1 cylinder |
| Displacement (CID/CC) | 7.5 / 123 |
| Full throttle RPM | 5000-6000 |
| Fuel induction system | 2-valve pushrod (overhead valve) |
| Recommended fuel | 87 octane / up to 10% ethanol |
| Recommended oil | Mercury FourStroke Oil 10W-30 |
| Engine protection operator warning system | Low oil pressure |
| Over-rev | |
| Starting | Manual |
| Steering | Tiller |
| Shaft length | 15″ / 381 mm |
| 20″ / 508 mm | |
| Gearcase ratio | 2.15:1 |
| Dry weight *Lightest model available | 57 lbs / 26 kg |
| CARB star rating | 3 |
| Bore and stroke | 2.32 x 1.77″ / 59 x 45 mm |
| Ignition | CDI w/electronic spark advance |
| Fuel system | Carbureted |
| Cooling system | Water-cooled with thermostat |
| Gear shift | F-N-R |
| Gearcase options | Standard |
| Trim positions | 6 |
| Exhaust system | Through prop |
| Shallow water drive | Yes |
| Shallow water trim range (degrees) | 16 |
| Integrated fuel tank (gal / L) | 0.3 / 1.1 |
| Optional fuel tank (gal / L) | 3.2 / 12 |
| Color | Phantom Black |
8 HP
Enhancements include simplified starting procedure, faster warmup, and better idle run quality. Lightweight: just 84 pounds. Great for aluminum tiller, inflatable soft hull, jon, utility, and sail boats.
| HP / kW | 8 / 5.9 |
| Engine type | Inline 2 |
| Displacement (CID/CC) | 12.8 / 208 |
| Full throttle RPM | 5000-6000 |
| Fuel induction system | 2 valves per cylinder, single overhead cam (SOHC) |
| Alternator amp / Watt | 6 amp / 76 watt |
| Recommended fuel | 87 octane / up to 10% ethanol |
| Recommended oil | Mercury FourStroke Oil 10W-30 |
| Engine protection operator warning system | Low oil pressure |
| Over-rev | |
| Starting | Electric |
| Manual | |
| Steering | Tiller |
| Shaft length | 15″ / 381 mm |
| 20″ / 508 mm | |
| Gearcase ratio | 2.08:1 |
| Dry weight *Lightest model available | 84 lbs / 38 kg |
| CARB star rating | 3 |
| Bore and stroke | 2.16 x 1.73″ / 55 x 44 mm |
| Ignition | CDI w/electronic spark advance |
| Fuel system | Carbureted |
| Cooling system | Water-cooled with thermostat |
| Gear shift | F-N-R |
| Gearcase options | Standard |
| Trim positions | Ratcheting |
| Exhaust system | Through prop |
| Shallow water drive | Yes |
| Shallow water trim range (degrees) | 16 |
| Remote fuel tank standard (gal / L) | 3.2 / 12 |
| Color | Phantom Black |
9.9 HP
Built to deliver the type of power, thrust, and control that wider, heavier boats require. Great for aluminum tiller, inflatable soft hull, jon, utility, and sail boats.
| HP / kW | 9.9 / 7.3 |
| Engine type | Inline 2 |
| Displacement (CID/CC) | 12.8 / 208 |
| Full throttle RPM | 5000-6000 |
| Fuel induction system | 2 valves per cylinder, single overhead cam (SOHC) |
| Alternator amp / Watt | 6 amp / 76 watt |
| Recommended fuel | 87 octane / up to 10% ethanol |
| Recommended oil | Mercury FourStroke Oil 10W-30 |
| Engine protection operator warning system | Low oil pressure |
| Over-rev | |
| Starting | Electric |
| Manual | |
| Steering | Remote |
| Tiller | |
| Shaft length | 15″ / 381 mm |
| 20″ / 508 mm | |
| 25″ / 635 mm (CT model) | |
| Gearcase ratio | 2.08:1 or 2.42:1 (CT model) |
| Dry weight *Lightest model available | 84 lbs / 38 kg |
| CARB star rating | 3 |
| Bore and stroke | 2.16 x 1.73″ / 55 x 44 mm |
| Ignition | CDI w/electronic spark advance |
| Fuel system | Carbureted |
| Cooling system | Water-cooled with thermostat |
| Gear shift | F-N-R |
| Gearcase options | Command Thrust (CT) |
| Standard | |
| Trim system | Power Tilt (CT model) |
| Trim positions | Ratcheting |
| Exhaust system | Through prop |
| Shallow water drive | Yes |
| Shallow water trim range (degrees) | 16 |
| Remote fuel tank standard (gal / L) | 3.2 / 12 |
| Color | Phantom Black |
15 EFI
Always moving forward. With boater-driven innovations and technologies. Like the world’s first multi-function tiller handle. And a total commitment to corrosion protection, utilizing hard-coat anodizing and a superior multi-step paint process. Mercury FourStroke engines have consistently set the bar for clean, quiet performance and low fuel consumption. Plus, no one has more models to fit your needs.
| HP / kW | 15 / 11.1 |
| Engine type | Inline 2 |
| Displacement (CID/CC) | 20.3 / 333 |
| Full throttle RPM | 5700 – 6200 |
| Fuel induction system | 2 valves per cylinder, single overhead cam (SOHC) |
| Alternator amp / Watt | 12/145 electric |
| Recommended fuel | 87 octane / up to 10% ethanol |
| Recommended oil | 25W-40 Synthetic Blend |
| Mercury FC-W 10W-30 4-Stroke Marine Oil | |
| Engine protection operator warning system | Low oil pressure |
| Low water pressure | |
| Over-rev | |
| Overheat | |
| Sensor failure | |
| Starting | Electric |
| Manual | |
| Steering | Remote |
| Tiller | |
| Shaft length | 15″ / 381 mm |
| 20″ / 508 mm | |
| 25″ / 635 mm | |
| Gearcase ratio | 2.15:1 |
| Dry weight *Lightest model available | 99 lbs / 45 kg |
| CARB star rating | 3 |
| Bore and stroke | 2.40 x 2.24″ / 61 x 57 mm |
| Ignition | CDI w/electronic spark advance |
| Fuel system | Electronic Fuel Injection (EFI) |
| Cooling system | Water-cooled with thermostat |
| Gear shift | F-N-R |
| Gearcase options | Standard |
| Trim system | Manual |
| Power Tilt | |
| Trim positions | 6 |
| Exhaust system | Through prop |
| Shallow water drive | Yes |
| Shallow water trim range (degrees) | 16 |
| Remote fuel tank (optional) | Yes |
| Remote fuel tank standard (gal / L) | 3.2 / 12 |
| Color | Phantom Black |
20 EFI
Ultra-lightweight (just 99 pounds) and reliable, with little vibration. Innovative tiller lets you lock the tiller at 73 degrees – great for fishing and trailering. Perfect for aluminum tiller, inflatable soft hull, jon, utility, and sail boats.
| HP / kW | 20 / 14.7 |
| Engine type | Inline 2 |
| Displacement (CID/CC) | 20.3 / 333 |
| Full throttle RPM | 5700 – 6200 |
| Fuel induction system | 2 valves per cylinder, single overhead cam (SOHC) |
| Alternator amp / Watt | 12/145 electric |
| Recommended fuel | 87 octane / up to 10% ethanol |
| Recommended oil | 25W-40 Synthetic Blend |
| Mercury FC-W 10W-30 4-Stroke Marine Oil | |
| Engine protection operator warning system | Low oil pressure |
| Low water pressure | |
| Over-rev | |
| Overheat | |
| Sensor failure | |
| Starting | Electric |
| Manual | |
| Steering | Remote |
| Tiller | |
| Shaft length | 15″ / 381 mm |
| 20″ / 508 mm | |
| Gearcase ratio | 2.15:1 |
| Dry weight *Lightest model available | 99 lbs / 45 kg |
| CARB star rating | 3 |
| Bore and stroke | 2.40 x 2.24″ / 61 x 57 mm |
| Ignition | CDI w/electronic spark advance |
| Fuel system | Electronic Fuel Injection (EFI) |
| Cooling system | Water-cooled with thermostat |
| Gear shift | F-N-R |
| Gearcase options | Standard |
| Trim system | Manual |
| Power Tilt | |
| Trim positions | 6 |
| Exhaust system | Through prop |
| Shallow water drive | Yes |
| Shallow water trim range (degrees) | 16 |
| Remote fuel tank (optional) | Yes |
| Remote fuel tank standard (gal / L) | 3.2 / 12 |
| Color | Phantom Black |
Interested In A FourStroke 2.5-20 HP?
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