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LA CROSSE, WI 608-784-9580

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2016 Mercury 4.0 Fourstroke Outboard

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About the 2016 Mercury 4.0 Fourstroke Outboard

Easy and Breezy

It sounds like an oxymoron: a feature-heavy, lightweight outboard. But to run one ofMercury’s 4, 5 or 6 hp FourStroke outboards is to believe in the seemingly impossible. These engines feature six trim positions and a standard shallow-water drive that delivers boaters the performance and maneuverability needed in any boating situation. Automatic decompression bleeds off compression during start-up, requiring less pulling force to start the engine. While running, exclusive Mercury through-prop exhaust, as opposed to the “over-the-prop” design used by competitors, promotes a more comfortable and quieter ride. All this comes in a package that, at just 55 lbs., is the lightest in its class*. Don’t call it a miracle—just call it aMercury.


Engine Configuration:Single Outboard
Engine Description:Mercury 40 Fourstroke Outboard
Total or Max HP:4

4 FourStroke Specifications

HP/Kw @ Prop 4 / 2.9
Full throttle RPM 4500-5500
Cylinder Configuration 1
Displacement (CID / CC) 7.5 / 123
Bore and Stroke (in / mm) 2.32 x 1.77in
59 x 45mm
Fuel Induction System 2-valve pushrod (overhead valve)
Ignition CDI w/electronic spark advance
Fuel System Carbureted
Alternator Amp 4 lighting / 2 charging amp / 50 lighting / 25 charging watt (Optional)
Cooling System Water-cooled with thermostat
Starting Manual
Gearcase Ratio 2.15:1
Gear Shift F-N-R
Steering Tiller
Trim Positions 6
Exhaust System Though prop
Shallow water drive Yes
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 / 1.0
Optional fuel tank (gal / L) 3.2 / 12
Engine Protection Operator Warning System Low oil pressure
Shaft Length 15 in (381mm)
Shaft Length 20 in (508 mm)
Dry Weight * Lightest model available 57lbs / 26kg
CARB Star Rating 3