Go anywhere with portable power.

Taking the fun with you is one of the great advantages of owning an inflatable boat or small fishing boat. Mercury offers a complete line of extremely light portable FourStroke outboards, with the widest range of models to choose from. So wherever you and your boat go, your Mercury portable FourStroke can also go. The entire line makes operation and portability easy with smart, simple features. Plus, clean, quiet, fuel-efficient FourStroke performance makes them the obvious power of choice.

Key 2.5 – 3.5hp Features

Twist and Shout

Spinning in circles to turn around can make anyone dizzy. That’s why Mercury’s 2.5 and 3.5 hp FourStrokes offer 360° steering and a twist grip throttle. The tiller handle can be turned over and the engine rotated to reverse the thrust.

They’ll Never Hold You Back

Mercury’s 2.5 – 3.5hp portable outboards are designed from the start to be compact, lightweight and easier to carry. By utilizing Mercury’s patented one-piece integrated cylinderblock design, we’ve eliminated gaskets and fasteners and made the powerhead much more compact and lightweight.

No Vibration is Good Vibration

Your steering hand will thank you. On average, Mercury’s 3.5hp fourstroke has 32% less tiller handle vibration than competitive outboards.

A Better Grip

Mercury's twist-throttle tiller handle is longer for better control – plus it folds for easy, compact storage.

HP/kW 2.5 / 1.9
Full throttle RPM 4500-5500
Cylinder Configuration 1
Displacement (CID / CC) 5.2 / 85
Bore and Stroke (in / mm) 2.16 x 1.42in
55 x 36mm
Fuel Induction System 2-valve pushrod (overhead valve)
Ignition CDI w/electronic spark advance
Fuel System Carbureted
Cooling System Water-cooled with thermostat
Starting Manual
Gearcase Ratio 2.15:1
Gear Shift F-N
Steering Tiller with 360° turning
Trim System 4 position
Trim Positions 4
Exhaust System Above prop
Shallow water trim range (degrees) 16
Recommended Oil Mercury 4-Stroke Outboard Oil
Recommended Fuel 87 octane/up to 10% ethanol
Integral fuel tank (gal / L) 0.3 / 0.95
Engine Protection Operator Warning System Over-rev
Shaft Length 15 in (381mm)
Dry Weight * Lightest model available 40lbs / 18kg
CARB Star Rating 3

FourStroke 2.5 - 3.5 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