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Four Stroke 75-150 HP

Mercury Four Stroke outboard motors are incredibly powerful and efficient, and they feature a wide range of applications. Crafted for less weight and high displacement, they generate abundant torque and immediate power. And because they don’t have to work as hard as heavier engines or those with lower displacement, they make boats plane faster and accelerate better, and they provide optimal fuel efficiency at cruising speed.
Powerful performance and lightweight design go together like the open water and a sense of adventure.
Great for deck, inshore fishing, bass, aluminum tiller, runabout open bow, inflatable rigid hull, and fish & ski boats.
Made to provide outstanding acceleration and throttle response.

Bosun's Marine OUTBOARDS

Designed For Effortless Exploration.

For decades, the start of a Mercury FourStroke outboard has also meant the start of an adventure. With innovative engineering and refined performance, our 25 to 150hp engines carry on that same pioneering legacy. Mercury FourStroke outboards feature efficient, lightweight designs that ensure no power goes wasted. So whether your day calls for a vacation or a voyage, a Mercury FourStroke outboard is the perfect accessory for your next adventure.

Bosun's Marine OUTBOARDS

Four Stroke 75-150 HP Specs

  • 75 HP

    Enjoy the same lifetime maintenance-free valvetrain design found in our 150 FourStroke motors. Great for deck, inshore fishing, bass, aluminum console, runabout open bow, inflatable rigid hull, and fish & ski boats.

    HP / kW

    75 / 56

    Engine type 8-valve single overhead cam (SOHC)

    Inline 4

    Displacement (L) 2.1
    Full throttle RPM 4500-5500
    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″ / 508 mm
    Gearcase ratio 2.07:1
    Dry weight *Lightest model available 359 lbs / 163 kg
    CARB star rating 3
    Bore and stroke 3.5 x 3.2″ / 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°)
  • 90 HP

    Made to provide outstanding acceleration and throttle response. Great for deck, inshore fishing, bass, aluminum tiller, aluminum console, runabout open bow, inflatable rigid hull, and fish & ski boats.

    HP / kW

    90 / 67

    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″ / 508 mm

    25″ / 635 mm

    Gearcase ratio 2.07:1 or 2.38:1 (CT model)
    Dry weight *Lightest model available 359 lbs / 163 kg; 363 lbs / 165 kg (CT model)
    CARB star rating 3
    Bore and stroke 3.5 x 3.2″ / 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 Command Thrust

    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°)

  • 115 HP

    The lightest low-emissions outboard in its power range. Great for deck, inshore fishing, bass, aluminum tiller, runabout open bow, inflatable rigid hull, and fish & ski boats.

    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

    Electro-Hydraulic Power Steering Optional on Duals

    Hydraulic power steering

    Shaft length 20″ / 508 mm

    25″ / 635 mm

    Gearcase ratio 2.07:1 or 2.38:1 (CT model)
    Dry weight *Lightest model available 359 lbs / 163 kg; 363 lbs / 165 kg (CT model)
    CARB star rating 3
    Bore and stroke 3.5 x 3.2″ / 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 Command Thrust (CT)

    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°)
  • 150 HP

    Get massive displacement and power from the lightest, easiest-to-maintain 150hp FourStroke on the market. Great for bass, aluminum console, runabout open bow, and offshore fishing boats and pontoons.

    HP / kW 150 / 110
    Engine type 8-valve single overhead cam (SOHC)

    Inline 4

    Displacement (L) 3.0
    Full throttle RPM 5000-5800
    Air induction Performance-Tuned Scroll Intake Manifold
    Fuel induction system Computer Controlled Multi-Port Electronic Fuel Injection (EFI)
    Alternator amp / Watt 60 amp / 756 watt (Belt-Driven)
    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 Electric (turn-key)

    Smart Start Electric

    Controls Mechanical throttle & shift
    Steering Big Tiller Compatible

    Dual cable mechanical

    Electro-Hydraulic Power Steering Optional on Duals

    Hydraulic power steering

    Shaft length 20″ / 508 mm

    25″ / 635 mm

    Gearcase ratio 1.92:1
    Dry weight *Lightest model available 455 lbs / 206 kg
    CARB star rating 3
    Bore and stroke 4.0 x 3.6″ / 102 x 92 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
    Counter Rotation Available
    Color Phantom Black
    Lubrication system Wet sump
    Oil Capacity 6.3 qts / 6.0l
    Maximum Trim Range 22° (-6° to 16°)
    Maximum Tilt Range 73° (-6° to 67°)

Interested In A Four Stroke 75-150 HP?

Bosun's Marine is your premier destination for Mercury Outboard Engines. Discover the power, reliability, and innovation of Mercury’s world-renowned marine engines right here. Whether you’re a seasoned boater or a newcomer to the water, our expert team is dedicated to helping you find the perfect Mercury Outboard Engine to suit your needs.

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