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.

Stone Harbor Marina OUTBOARDS

FOURSTROKE TECHNOLOGY AND MERCURY

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.

Stone Harbor Marina OUTBOARDS

FourStroke 2.5-20 HP Specs

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

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

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

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

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

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

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

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

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

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?

Stone Harbor Marina is your premier destination for Mercury Outboard Engines. Discover the power, reliability, and innovation of Mercury’s world-renowned marine engines right here. Whether you’re a seasoned boater or a newcomer to the water, our expert team is dedicated to helping you find the perfect Mercury Outboard Engine to suit your needs.

FourStroke 2.5-20 HP

Stone Harbor Marina OUTBOARDS

FOURSTROKE TECHNOLOGY AND MERCURY

Stone Harbor Marina OUTBOARDS

FourStroke 2.5-20 HP Specs

Interested In A FourStroke 2.5-20 HP?

We Can Finance Your Repower

Stay Connected.

Stay up to date on promotions, events, and special offers.

Buy & Sell

Service & Parts

Resources

Visit & Contact

Follow

FourStroke 2.5-20 HP

Stone Harbor Marina OUTBOARDS

FOURSTROKE TECHNOLOGY AND MERCURY

Stone Harbor Marina OUTBOARDS

FourStroke 2.5-20 HP Specs

2.5 HP

3.5 HP

4 HP

5 HP Sail Power

5 HP

6 HP

8 HP

9.9 HP

15 EFI

20 EFI

Interested In A FourStroke 2.5-20 HP?

We Can Finance Your Repower

Stay Connected.

Stay up to date on promotions, events, and special offers.

Buy & Sell

Service & Parts

Resources

Visit & Contact

Follow