Innovating the industry with battery-free power.

Mercury FourStrokes have long led the pack in clean, quiet, fuel-efficient outboard power, and now the gap grows even wider. We combined innovative engineering with advanced reliability and features to make our outboards run clean, stay quiet, and deliver smooth, responsive performance – all while cutting your fuel and maintenance costs.

The 25 and 30hp FourStrokes have an industry-first battery-less EFI system for easier starting, smooth running, and improved efficiency. That’s not a misprint – they feature electronic fuel injection with no battery.

RELIABILITY

Consistent Starting

Mercury FourStroke EFI outboards deliver consistent, easy starts, smooth operation, and reliability. The 25 and 30hp models are the industry's first batteryless EFI outboards.

PERFORMANCE

Born To Be Smooth

All portable and mid-range Mercury FourStrokes feature inline designs for inherently smooth operation.

Powerful 3-Cylinder Design

Every 25 and 30hp Mercury Fourstroke utilize a three-cylinder engine design that delivers better inherent balance than the twin cylinder designs used by competitive outboards. Mercury’s three cylinder approach results in a smoother and quieter user experience.

EASE-OF-USE

Fun at your Fingertips

Mercury Fourstrokes are designed with a boat load of user-friendly features, such as our multifunction tiller handle. Available on gas assist or power trim models, this tiller handle gives you easy one-handed operation of shifting, stopping, throttle, tilt and starting. More control equals better maneuverability.

HP/kW 25 / 18.6
Full throttle RPM 5000-6000
Cylinder Configuration I-3
Displacement (CID / CC) 32.1 / 526
Bore and Stroke (in / mm) 2.40 x 2.36in
61 x 60mm
Fuel Induction System 2 valves per cylinder, single overhead cam (SOHC)
Ignition CDI w/electronic spark advance
Fuel System Electronic Fuel Injection (EFI)
Alternator Amp 15 amp / 186 watt
Cooling System Water-cooled with thermostat
Starting Electric (turn-key)
Manual
Gearcase Ratio 1.92:1
Gear Shift F-N-R
Steering Remote
Tiller
Trim System Manual
Power Trim
Exhaust System Through prop
Shallow water trim range (degrees) 16
Recommended Oil Mercury 4-Stroke Outboard Oil
Recommended Fuel 87 octane/up to 10% ethanol
Remote fuel tank standard (gal / L) 6.6 / 25
Engine Protection Operator Warning System Low oil pressure
Overheat
Over-rev
Sensor failure
Shaft Length 15 in (381mm)
20 in (508 mm)
Dry Weight * Lightest model available 157lbs / 71kg
CARB Star Rating 3

FourStroke 25 - 30 HP Engine Tests

There are currently no engine tests for this product line.

FourStroke 25 - 30 HP Resources

Buy the Books

You can order all available Mercury literature online or through any authorized Mercury dealer. Please have your outboard or sterndrive serial number before placing the order.

  • Operation, Maintenance and Warranty Manuals
  • Parts Manual
  • Service Manual
Purchase a Manual
Request a Brochure

Request printed brochures by mail or download as an electronic PDF.

Request a Brochure

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Engine Tests Fuel Care