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2018 Mercury 3.5MH FourStroke 3.5 HP - 15 in. Shaft

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 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.


Delivers lightweight, portable power and thrust for exact operation. Perfect for aluminum tiller, inflatable soft hull, jon, utility, and sail boats.

Small Outboards are of Big Importance: While high-horsepower models usually grab headlines in the world of outboard engines, it’s small outboards that make much of the boating world go around.


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

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


Dry weight based on lightest model available.

2018 Mercury 3.5MH FourStroke 3.5 HP - 15 in. Shaft

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