2026 Mercury Marine Racing Outboard 300R V-8 FourStroke

Mercury Racing 300R Outboard for High-Performance Boats

The Mercury Racing 300R outboard is a purpose-built 300 HP V-8 FourStroke engineered to deliver blistering speed, crisp throttle response, and race-bred durability for serious performance boaters. Tuned with Mercury Racing components, this Mercury Racing 300R for sale is the ideal choice for high-performance applications and premium repower projects demanding top-end power with everyday reliability.

Designed to bridge competition technology with recreational usability, the 300R provides unmatched control and confidence across a wide range of hulls.

4.6L V8 Power with Advanced Range Optimization

At the core of the Mercury 300R outboard engine is a naturally aspirated 4.6-liter V-8 featuring a custom short-runner intake manifold and Advanced Range Optimization (ARO) closed-loop fuel control. This system continuously adjusts fuel delivery for peak efficiency and performance at all speeds.

Power & efficiency highlights:

• 300 HP V-8 FourStroke performance
• 4.6L displacement for strong torque
• EFI computer-controlled fuel system
• ARO for optimized fuel efficiency
• 5800–6400 RPM full-throttle range
• Smooth idle with instant throttle response

This makes the Mercury Racing 300R EFI motor a true balance of raw power and refined operation.

Customizable Midsection & Gearcase Options

The Mercury Racing 300R performance outboard is offered in multiple configurations to match your exact setup. Choose from standard, heavy-duty, or racing AMS midsections, plus three proven gearcase options for ultimate flexibility.

Configuration options include:

• Shaft lengths: 20″, 25″, or 30″
• Gearcases: Torque Master, Sport Master, 5.44 HD
• Gear ratios: 1.85, 1.75, or 1.60
• Skeg: camber or straight
• Trim: standard or heavy-duty
• Controls: DTS or mechanical

This near-custom approach allows buyers to build the perfect Mercury Racing 300R racing outboard for speed, handling, and ease of installation.

Smart Technology & Race-Ready Reliability

Built for durability in demanding environments, the new Mercury Racing 300R outboard features digital inductive ignition, SmartStart protection, and robust charging systems to support onboard electronics.

Technology & protection:

• Digital inductive ignition system
• Electric start with SmartStart protection
• Charging output: up to 115 amps (AMS)
• Closed-loop fuel management
• Built for reduced maintenance
• Backed by a 3-year Mercury warranty

Whether for offshore runs or competitive lake setups, the Mercury Racing 300R high performance motor delivers confidence at wide-open throttle.