None More Durable. Or Efficient.
Tuned for max acceleration and throttle response.
Lightweight & Fuel Efficient: Mercury’s world-renowned engineering team has packed incredible power into these lighter, compact four-cylinder single-overhead-cam engines. The 115hp weighs 20 pounds less than its closest four-stroke competitor, making it the world’s lightest low-emissions outboard in its power range.
Counter-Rotation: Do you like to boat offshore even though you’re not in the market for a big boat? For the first time, Mercury is offering a 115hp FourStroke with left-hand rotation. Two of these mid-range monsters on your transom provide the maneuverability and get-home safety of higher-horsepower twins at a price that’s easier on your wallet. Unlike competitive dual 115hp engines, dual 115 Mercury FourStrokes are Command Thrust models, which swing V6-class propellers, such as Enertia series to deliver improved acceleration and better boat control in rough water. (*Available only on 115 hp)
Worry-free: The same lifetime maintenance-free valvetrain design found in our 150 FourStroke engines makes the 75-115hp FourStroke outboards incredibly durable.
Bigger Footprint: The larger Command Thrust gearcase creates a bigger footprint in the water, which provides more leverage to control your boat. The larger torpedo, combined with a bigger-diameter prop, can lift a heavy boat onto plane more easily and hold it there at lower speeds without impacting top speed.
Powerful & Efficient: Less weight and high displacement mean Mercury’s new 75 - 115 FourStrokes generate abundant torque and immediate power. Because they don’t have to work as hard as heavier engines or those with lower displacement, these engines make boats plane faster, accelerate better and provide optimal fuel efficiency at cruising speed.
Quieter Than the Competition: The Mercury 115 FourStroke is quieter than the Yamaha F115B across the rpm band. At idle, the Mercury is four decibels quieter than the Yamaha – the Yamaha is 25% louder; At cruising speed, where normal conversations occur, the Yamaha generates almost 15% more noise; At wide-open-throttle, the Mercury is more than eight decibels quieter – the Yamaha is 50% louder. (Testing performed by Mercury PD&E NVH staff at a Mercury Marine hemi-anechoic chamber (Sound Lab).)
Smoother Than the Competition: The Mercury 115 FourStroke has less vibration and rides smoother than the Yamaha F115B. At forward idle, the Mercury’s vibration level at the driver’s seat is up to 50% lower than the Yamaha; On the transom, the Yamaha puts out nearly five times more vibration than the Mercury – both at cruise and at full throttle. (Testing performed by Mercury PD&E NVH staff at a Mercury Marine test location on a 2013 Bayliner 170.)
HP / kW: 115 / 86
Engine type: 8-valve single overhead cam (SOHC) Inline 4
Displacement (L): 2.1
Full throttle RPM: 5000-6000
Air induction: Performance-Tuned Scroll Intake Manifold
Fuel induction system: Computer Controlled Multi-Port Electronic Fuel Injection (EFI)
Alternator amp / Watt: 35 amp / 441 watt with water-cooled voltage regulator
Recommended fuel: Unleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum
Recommended oil: Mercury FourStroke Oil 10W-30
Engine protection operator warning system: SmartCraft Engine Guardian
Compatible with SmartCraft digital technology: Yes
Starting: Smart Start Electric
Controls: Mechanical throttle & shift
Steering: Big Tiller Compatible; Dual cable mechanical; Hydraulic power steering
Shaft length: 20 in. / 508 mm
Gearcase ratio: 2.07:1
Dry weight *Lightest model available: 359 lb. / 163 kg
CARB star rating: 3
Bore and stroke: 3.5 x 3.2 in. / 90 x 81 mm
Ignition: SmartCraft ECM 70 Digital Inductive
Fuel system: Electronic Fuel Injection (EFI)
Cooling system: Water-cooled with thermostat
Gear shift: F-N-R
Gearcase options: Standard
Trim system: Power Tilt; Power Trim
Exhaust system: Through prop
Shallow water trim range (degrees): 20
Color: Phantom Black
Lubrication system: Wet sump
Oil Capacity: 5.5 qts / 5.2 l
Maximum Trim Range: 22° (-6° to 16°)
Maximum Tilt Range: 70° (-6° to 64°)
Dry weight specification is for the lightest-version model. Comparative weights refer to base engines without oil, propeller or integral steering cylinder. Weights based on Owner’s Manual specifications.