2.5-25hp

Output far beyond its size

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 best-in-class acceleration to go with best-in-class speed. Easy to install and operate, with reliable starting, low vibration and instant throttle response. It's worry-free boating at its best.

Engine Information and Specifications

25 EFI

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Engine Details

Delivers consistent, easy starting, crisp throttle response, increased fuel economy, and outstanding overall performance. Great for aluminum tiller, aluminum console, jon, utility, and fish & ski boats.

Specifications - 25 EFI

HP / kW	25 / 18.6
Engine type	Inline 3
Displacement (CID/CC)	32.1 / 526
Full throttle RPM	5000-6000
Fuel induction system	2 valves per cylinder, single overhead cam (SOHC)
Alternator amp / Watt	15 amp / 186 watt
Recommended fuel	Unleaded 90RON minimum
Recommended oil	Mercury FourStroke Oil 10W-30
Engine protection operator warning system	Low oil pressure Over-rev Overheat Sensor failure
Starting	Electric (turn-key) Manual
Steering	Remote Tiller
Shaft length	15" / 381 mm 20" / 508 mm
Gearcase ratio	1.92:1
Dry weight *Lightest model available	71 kg
CARB star rating	3
Bore and stroke	2.40 x 2.36" / 61 x 60 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 Trim
Exhaust system	Through prop
Shallow water trim range (degrees)	16
Remote fuel tank standard (gal / L)	6.6 / 25
Color	Phantom Black

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Announcing NEW Mercury 20hp & 15hp outboards

The ultimate boating experience comes standard. Mercury’s newest addition to its lineup of portable FourStroke outboard motors is designed and built to improve every aspect of your time on the water, from starting the engine to changing the oil and everything in between. Watch here.

Reliability, Portability and Power with the convenience of Propane

Mercury’s all-new 5hp FourStroke Propane outboard provides more convenience and less hassle. With a large 123cc displacement, it offers best-in-class power by delivering a true 5 horsepower. Sail Power model is designed for sailboats, and features an alternator and more thrust.