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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.

mercury boat engine 175-300hp

Intuitive, Innovative Features

175-300hp merucry boat engine feature
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.

mercury 175-300hp feature
Smooth and Quiet

The V8 and V6 FourStroke engines are quieter and smoother than the leading competitor.

boat engine 175-300hp
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.

mercury 175-300hp outboard
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.

mercury 175-300hp feature
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.

Engine Specifications by Horsepower

Horsepower 300 200 175
Engine type V8 V6 V6
Displacement (CID/CC) 279 CID 3.4L 209 CID
Displacement (L) 4.6L 3.4L 3.4L
Cylinder Configuration 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
Full throttle RPM 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
Starting Electric Start with SmartStart Protection Electric Start with SmartStart Protection Electric Start with SmartStart Protection
Steering Hydraulic (standard) Power (optional) Hydraulic (standard) Power (optional) Big Tiller (optional) Big Tiller (optional) Hydraulic (standard) Power (optional)
Shaft length 20" / 508 mm 25" / 635 mm 20" / 508 mm 25" / 635 mm 20" / 508 mm
25" / 635 mm
Gearcase ratio 1.75:1 1.85:1 1.85:1
Dry weight *Lightest model available 527 lbs / 239 kgs 475 lbs / 216 kgs 475 lbs / 216 kgs
Trim system Power trim and tilt Power trim and tilt Power trim and tilt
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