FourStroke 175-300hp
No Sacrifices, No Compromises, No Apologies

Reliability, flexibility, power and efficiency – all within your reach. Backed by decades of marine power innovation and product leadership, Mercury V8 and V6 FourStroke outboards deliver legendary performance and forward-thinking technology. FourStroke outboards are built for any body of water and a wide variety of boats.

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Adaptive Speed Control
Adaptive Speed Control maintains a desired rpm regardless of changes in load or conditions without adjustments to the throttle lever position – a first for the outboard industry

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Smooth and Quiet
The V8 and V6 FourStroke engines are quieter and smoother than the leading competitor.
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Easy to Maintain
The exclusive Top Cowl Service Door simplifies routine maintenance, letting you check or add engine oil without removing the top cowl. An hour-based maintenance schedule decal is located under the cowl, providing a quick overview of routine maintenance.

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Industry-Exclusive Battery Management Technology
When battery voltage is low, engines will automatically increase idle rpm to boost alternator output and charge batteries to the proper level, protecting batteries from draining while trolling and operating electronic devices.
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Ample Charging Output
FourStroke models feature a robust alternator that delivers 20 amps net of charging power at idle and 30 amps total at wide-open throttle.

Quick Acceleration
The high-displacement, quad-cam design of the V8 and V6 FourStroke powerheads generates plenty of torque, especially at mid-range.

Superior Fuel Economy
Advanced Range Optimisation improves cruise-speed fuel efficiency by automatically adjusting fuel delivery so seamlessly the operator won’t feel or hear it.
Light and Compact
Mercury V8 and V6 FourStroke outboards are the lightest in their respective class by at least 5kg and mount on 26-inch centres for broader fitment.

Engine Specifications by Horsepower

Horsepower
300
250
225
200
175
Engine type
  • V8
  • V8
  • V6
  • V6
  • V6
Displacement (CID/CC)
  • 279 CID
  • 279 CID
  • 209 CID
  • 209 CID
  • 209 CID
Displacement (L)
  • 4.6L
  • 4.6L
  • 3.4L
  • 3.4L
  • 3.4L
Cylinder Configuration
  • V-8 [64 degree] with Dual Overhead Cam [DOHC] and 32-valves
  • V-8 [64 degree] with Dual Overhead Cam [DOHC] and 32-valves
  • V-6 [64 degree] with Dual Overhead Cam [DOHC] and 24-valves
  • V-6 [64 degree] with Dual Overhead Cam [DOHC] and 24-valves
  • V-6 [64 degree] with Dual Overhead Cam [DOHC] and 24-valves
Full throttle RPM
  • 5200-6000
  • 5200-6000
  • 5200-6000
  • 5000-5800
  • 5000-5800
Alternator amp / Watt
  • 85-amp (1071 Watt) with Idle Charge
  • 85-amp (1071 Watt) with Idle Charge
  • 85-amp (1071 Watt) with Idle Charge
  • 85-amp (1071 Watt) with Idle Charge
  • 85-amp (1071 Watt) with Idle Charge
Starting
  • Electric Start with SmartStart Protection
  • Electric Start with SmartStart Protection
  • Electric Start with SmartStart Protection
  • Electric Start with SmartStart Protection
  • Electric Start with SmartStart Protection
Steering
  • Hydraulic (standard)
  • Power (optional)
  • Big Tiller (optional)
  • Hydraulic (standard)
  • Power (optional)
  • Big Tiller (optional)
  • Hydraulic (optional)
  • Hydraulic (standard)
  • Joystick Piloting for Outboards
  • Power (optional)
  • Big Tiller (optional)
  • Hydraulic (optional)
  • Joystick Piloting for Outboards
  • Power (optional)
  • Big Tiller (optional)
  • Hydraulic (optional)
  • Joystick Piloting for Outboards
  • Power (optional)
Shaft length
  • 20" / 508 mm
  • 25" / 635 mm
  • 20" / 508 mm
  • 25" / 635 mm
  • 30" / 762 mm
  • 20" / 508 mm
  • 25" / 635 mm
  • 30" / 762 mm
  • 20" / 508 mm
  • 25" / 635 mm
  • 20" / 508 mm
  • 25" / 635 mm
Gearcase ratio
  • 1.75:1
  • 1.75:1
  • 1.85:1
  • 1.85:1
  • 1.85:1
Dry weight *Lightest model available
  • 527 lbs / 239 kgs
  • 527 lbs / 239 kgs
  • 475 lbs / 216 kgs
  • 475 lbs / 216 kgs
  • 475 lbs / 216 kgs
Trim system
  • Power trim and tilt
  • Power trim and tilt
  • Power trim and tilt
  • Power trim and tilt
  • Power trim and tilt

FourStroke Advantage

Go Farther: Advanced Range Optimisation by Mercury Marine uses closed-loop fuel control to precisely adjust the fuel mixture and deliver the best possible efficiency.

Keep It Steady: Adaptive Speed Control maintains engine speed (rpm) regardless of load or condition changes – such as rough water, tight turns, tow sports and lower speeds on plane – without having to frequently adjust throttle position, a first for the outboard industry.

Lighter by Design: Ounce by ounce, Mercury engineers cut kilo's from the FourStroke outboards, ensuring each engine is the lightest in its respective class.

Smart Charging: Idle Charge battery-management prevents boaters from draining their batteries while operating multiple electronic devices. When battery voltage is reduced, the engine will automatically increase idle rpm to boost alternator output and recharge low batteries to the proper level.