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Grove Harbour Marine
2017 Mercury SeaPro FourStroke 90 HP
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The most efficient mid-range, working FourStrokes ever.

The SeaPro FourStroke Mid-Range takes it to the next level - unbridled power, unusually compact, uncompromising reliability, unbelievably fuel efficient.

Standard Features
  • Phantom Black
  • 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.
  • Corrosion Resistance.
    Mercury's proprietary formula - XK360, is an extremely low copper content aluminium alloy, which leads the industry in corrosion resistance. This makes costly corrosion failures and high labour bills a thing of the past. Most competitors use alloys with 2% to 4% copper content which will corrode faster than our MercAlloy, XK360 or A356 alloys
  • Easy to Gauge.
    Accurate digital information is presented in a clean, easy-to-read gauge for instant, reliable information at a glance. Combined with additional sensors, Mercury's standard gauges are powerful tools to provide safety and comfort while on the water.
  • Leading Gearcase Technology.
    All 75-115hp SeaPro FourStrokes utilize the Command Thrust gearcase. This heavy-duty gearcase allows users to run an oversized prop, sits deeper in the water and incorporates a different gearcase ratio - all designed to improve handling and more easily lift heavier boats.
  • Repower with SeaPro.
    The compact size also means older boats that were not initially designed for the weight of heavier four-strokes can now be repowered and reborn to perform at their best with the latest technology.
  • Stiffer Upper Mounts.
    On the SeaPro range the upper mounts are designed to be also two times stiffer than recreational models to maximize durability. Their longevity makes them ideally suited to the demands and rigors of commercial applications.
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 Range5000-5500
Ignition SystemSmartCraft ECM 70 Digital Inductive
StartingSmart Start Electric
Gear ShiftF-N-R
SteeringBig Tiller
Dual cable mechanical
Oil Capacity5.5 qts / 5.2l
Trim SystemPower Tilt
Power Trim
Recommended OilNMMA Certified FCW 25W-40 Synthetic Blend
CARB Star Rating3
Exhaust SystemThrough prop
Compatible with Smartcraft Digital TechnologyYes
Shallow Water Trim Range (Degrees)20
Engine Protection Operator Warning SystemSmartCraft Engine Guardian
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
Displacement (L)2.1
HP / kW90 / 67
Maximum Trim Range22° (-6° to 16°)