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Grove Harbour Marine
2017 Mercury FourStroke 90 HP Command Thrust
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Overview
None More Durable. Or Efficient.

Tuned for max acceleration and throttle response.

Standard Features
Color
  • Phantom Black
STANDARD FEATURES
  • 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.
  • 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
  • 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.
    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.
  • 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.
  • Propped to perform
    The Mercury Enertia® propeller is the perfect complement to the 75 - 115hp FourStroke Command
    Thrust gearcases. Designed specifically for large fourstroke outboards with a revolutionary low-diameter / high-blade-area design and cast with the Mercury proprietary X7® propeller alloy, Enertia delivers phenomenal acceleration, top speed and durability.
  • 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).
  • Repower Financing.
    With Mercury Repower Financing, you can easily power up everything from fishing boats, to runabouts, to cruisers with flexible financing on the engine. You can also choose to finance rigging, gauges, controls and even labor. Mercury Repower Financing offers low rates and low monthly payments to fit a boater's budget.
  • 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.
  • Worry-free
    The same lifetime maintenance-free valvetrain design found in our 150 FourStroke engines makes the 75-115hp FourStroke outboards incredibly durable.
Options
Specifications
Engine Specs
Engine Type8-valve single overhead cam (SOHC)
Inline 4
Bore & Stroke (in/mm)3.5 x 3.2" / 90 x 81 mm
Fuel SystemElectronic Fuel Injection (EFI)
Fuel Induction SystemComputer Controlled Multi-Port Electronic Fuel Injection (EFI)
Lubrication SystemWet sump
Cooling SystemWater-cooled with thermostat
Full Throttle RPM Range5000-6000
Ignition SystemSmartCraft ECM 70 Digital Inductive
StartingSmart Start Electric
Gear ShiftF-N-R
SteeringBig Tiller Compatible
Dual cable mechanical
Hydraulic power steering
Oil Capacity5.5 qts / 5.2 l
Trim SystemPower Tilt
Power Trim
Recommended OilMercury FourStroke Oil 10W-30
CARB Star Rating3
Exhaust SystemThrough prop
Engine Protection Operator Warning SystemSmartCraft Engine Guardian
Compatible with Smartcraft Digital TechnologyYes
Shallow Water Trim Range (Degrees)20
Recommended FuelUnleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum
Dry Weight * Lightest model available363 lbs / 165 kg
Maximum Tilt Range70° (-6° to 64°)
Alternator amp / Watt35 amp / 441 watt with water-cooled voltage regulator
ControlsMechanical throttle & shift
Shaft Length20" / 508 mm
25" / 635 mm
Air Induction SystemPerformance-Tuned Scroll Intake Manifold
Gearcase Ratio2.38:1
Gearcase OptionsCommand Thrust
Displacement (L)2.1
HP / kW90 / 67
Maximum Trim Range22° (-6° to 16°)
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