2027 Mercury Marine FourStroke 300hp 20 in

FourStroke 250-300hp
Mercury 4.6L V8 250 and 300hp FourStroke outboards deliver legendary performance and an all-around elevated boating experience. Reliability. Comfort. Power. Handling. Easy ownership. Flexibility. For any body of water and across a wide variety of boats, every facet of a Mercury FourStroke outboard is engineered to ensure you make the most of your time on the water.

FourStroke Performance Data

Exceptionally Smooth & Quiet
The V8 300hp FourStroke outboard is 33% quieter at cruise with 30% less transmitted vibration at idle than the leading four-stroke competitor.

High Displacement
The high-displacement, quad-cam design of the V8 FourStroke powerhead generates serious torque, especially at mid-range, for quick acceleration and exciting speeds.

Light & Compact
The V8 300hp FourStroke outboard is the lightest in the 300hp class by more than 20 pounds. Both V8 models mount on 26-inch centers for easy repowers or new installation on a wide range of boats.

FourStroke Advantage
Comfort 
With a balanced powerhead and sophisticated, vibration-dampening cowl design, Mercury FourStroke outboards deliver an exceptionally smooth and quiet ride at any speed.

Durability 
Premium corrosion-preventive technologies and durable components ensure FourStroke outboards can stand up to the most demanding marine environments.

Compact Design
Ideal for new engine setups or repowers, the slender width of a Mercury FourStroke outboard fits most transoms, including those with narrow engine wells and tight motor spacing.

Efficiency 
Explore farther and stay out longer thanks to impressive power-to-weight ratios, intelligent fuel systems and optimized fuel injection (on most models) that maximize performance from every drop of fuel.

SmartCraft® The Power to Do More
Mercury SmartCraft® digital technologies refine the entire boating experience to ensure every day on the water reaches its full potential. From intelligent gauges and displays to advanced systems that make boat control easy, SmartCraft gives you the power to do more with your time on the water. 

Gauges
SmartCraft digital gauges are a convenient solution for staying in the know. They offer at-a-glance access to precise engine data and select SmartCraft controls on a compact digital interface.

Displays
With SmartCraft, you can integrate your engine with a compatible onboard display, gaining instant access to performance data and SmartCraft controls on the screen you use most.

Controls
Enjoy instantly responsive control and precise handling with Mercury digital control systems. Whether driving or docking, every task is made easier so you can take the helm with confidence. 

Connectivity
The Mercury Marine app is the ultimate boating companion. It transforms your mobile device into a hub for monitoring data, connecting with a dealer and viewing helpful content.

Warranty & Maintenance
Warranty Coverage
Mercury makes world-class marine products backed by world-class warranties.

Maintenance
At Mercury, we make maintenance easy. Learn more about how to keep your Mercury products performing at their peak.

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Features may include:

Intuitive, Innovative Features
Adaptive Speed Control

• The Adaptive Speed Control feature lets you maintain engine rpm despite changes in load or conditions. Climbing large swells is easier. Cruising at low speeds is smoother. Carving out tight turns is effortless. 

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.

Industry-Exclusive Battery Management Technology

• When needed, the idle charge battery management system works for you by monitoring battery voltage and adjusting engine rpm at idle to boost alternator output.

Smooth and Quiet

• Featuring a large muffler and a vibration-dampening cowl design, Mercury V8 FourStroke outboards deliver an exceptionally smooth, quiet ride at any speed.

Ample Charging Output

• A powerful alternator delivers 85 amps of charging power at wide-open throttle – perfect for keeping onboard electronics running long into the fun.