Mercury Marine
Mercury Marine

2018 Mercury Marine FourStroke 300 HP - 25 in. Shaft

Brochure

2018 FourStroke 300 HP - 25 in. Shaft Overview & Specs

Engine
Engine TypeV-8
Bore x Stroke3.6 in. x 3.4 in. (92 mm x 86 mm)
Displacement4.6L
StartingElectric Start with SmartStart Protection
Dimensions
Shaft Length25 in. (635 mm)
Weight527 lb. (239 kg)
General
Trim MethodPower trim and tilt
Shaft RotationCounter Rotation available
Propshaft Horsepower300 hp (224 kW)
Full Throttle Operating Range5200-6000 rpm
Gear Ratio / Shift1.75:1 / F-N-R
Fuel InductionElectronic Fuel Injection (EFI) Computer Controlled with Advanced Range Optimization
Alternator85-amp (1071 Watt) with Idle Charge
CoolingWater-cooled with thermostat
SteeringHydraulic (standard); Power (optional)

Efficiency Without Compromise



Take your time on the water to a whole new level. Mercury FourStroke engines deliver unsurpassed power and performance in an efficient, reliable package. Tougher, smaller, and lighter than any other outboard motor on the water, built to go the distance on a wide variety of boats, and guaranteed to get you the most out of every adventure.

Features
  • These robust motors deliver Mercury’s best-ever FourStroke hole shot, top speed and fuel efficiency. Great for aluminum fishing, deck, inflatable rigid hull, inshore fishing, offshore fishing and runabouts and tritoons.
  • Making Boating Easier and Safer: Since its launch at the 2016 Miami International Boat Show, Mercury Marine’s Active Trim has been providing a “wow” factor, impressing the most seasoned boaters.
  • All-new V-6 3.4L FourStroke wins Innovation Award: Mercury Marine has been awarded a 2018 Innovation Award by the National Marine Manufacturers Association in the Outboard Engine category. The all-new V-6 FourStroke outboard family impressed the judges with its new look, design and features designed to enhance the boating experience.
Specifications
  • HP / kW: 300 / 224
  • Engine type: V-8
  • MidSection: Conventional MidSection
  • Displacement (CID/CC): 279 CID
  • Displacement (L): 4.6L
  • Cylinder Configuration: V-8 [64 degree] with Dual Overhead Cam [DOHC] and 32-valves
  • Full throttle RPM: 5200-6000
  • Air induction: Performance-Tuned Long-Runner Intake Manifold
  • Fuel induction system: Electronic Fuel Injection (EFI) Computer Controlled with Advanced Range Optimization
  • Alternator amp / Watt: 85-amp (1071 Watt) with Idle Charge
  • Recommended fuel: Unleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum
  • Recommended oil: NMMA Certified FCW SAE 10W-30
  • Engine protection operator warning system: SmartCraft Engine Guardian
  • Compatible with SmartCraft digital technology: Yes
  • Starting: Electric Start with SmartStart Protection
  • Controls: Remote Mechanical or Digital Throttle & Shift (DTS)
  • Steering: Hydraulic (standard); Power (optional)
  • Shaft length: 25" / 635 mm
  • Gearcase ratio: 1.75:1
  • Dry weight *Lightest model available: 527 lbs / 239 kgs
  • CARB star rating: 3
  • Bore and stroke: 3.6 in x 3.4 in / 92 mm x 86 mm
  • Ignition: SmartCraft PCM 112 Digital Inductive
  • Cooling system: Water-cooled with thermostat
  • Gear shift: F-N-R
  • Gearcase options: 5.44"
  • Trim system: Power trim and tilt
  • Exhaust system: Through prop
  • Counter Rotation: Available
  • Color: Cold Fusion White; Pearl Fusion White; Phantom Black; Warm Fusion White
  • Lubrication system: Integrated wet sump
  • Oil Capacity: 7.0 Quarts / 6.6 Liters
  • Maximum Trim Range: 20° (-6° to 14°)
  • Maximum Tilt Range: 73° (-6° to 67°)
NOTES:
Dry Weight based on lightest model available.

*Not all color options and models available in all regions.

Compare Models

 






   
Year2018  
ManufacturerMercury  
ModelFourStroke 300 HP - 25 in. Shaft  
StyleOutboard  
PriceCall for Price  
Dimensions
Shaft Length25 in. (635 mm)  
Weight527 lb. (239 kg)  
Engine
Engine TypeV-8  
Bore x Stroke3.6 in. x 3.4 in. (92 mm x 86 mm)  
Displacement4.6L  
StartingElectric Start with SmartStart Protection  
General
Trim MethodPower trim and tilt  
Shaft RotationCounter Rotation available  
Propshaft Horsepower300 hp (224 kW)  
Full Throttle Operating Range5200-6000 rpm  
Gear Ratio / Shift1.75:1 / F-N-R  
Fuel InductionElectronic Fuel Injection (EFI) Computer Controlled with Advanced Range Optimization  
Alternator85-amp (1071 Watt) with Idle Charge  
CoolingWater-cooled with thermostat  
SteeringHydraulic (standard); Power (optional)  
Warranty   

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Valley Isle Marine Center
Mon - Fri8:00 a.m.5:00 p.m.
SunClosed
Hawaii Marine Center
Mon - Fri9:00 a.m.4:00 p.m.
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