Powered by a naturally aspirated 4.6L V8 with dual overhead camshafts and 32 valves, the 300R delivers instant throttle response. Strong torque is available throughout the rpm range. It is an ideal choice for replacing a high-output two-stroke or powering a new performance build.

The 15-inch Heavy Duty Conventional MidSection (HD CMS) is built to withstand extreme conditions. Forged transom brackets, solid mounts and a robust single-ram trim system with a remote pump provide stability and confidence at high speeds.

Multiple rigging options allow near-custom configuration. Choose digital or mechanical throttle and shift, hydraulic or power steering, and TorqueMaster or Sport Master gearcases. Each option allows the engine to be matched precisely to your performance goals.

Compact, capable and uncompromising, the Mercury Racing 300R is built for precision handling and explosive acceleration. It delivers long-term durability in demanding high-performance boating environments.

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A 4.6L V8 powerhead sits at the core of the 250R. A performance-tuned long-runner intake and a 32-valve dual overhead cam valve train help the engine move more air and fuel. Mercury Transient Spark technology further boosts torque for a stronger hole shot.

The Tri-Ram Conventional MidSection (CMS) is designed for stability and control at very high speeds. Solid lower engine mounts and a high-durometer upper mount reduce movement and sharpen handling in demanding single-engine setups.

A race-proven Sport Master surface-piercing gearcase lets the 250R run cleanly at speeds beyond 85 mph. It features low water pickups and a crescent leading edge to maximize efficiency and maintain water pressure. A wide selection of Mercury Racing propellers makes it easy to fine-tune performance for your boat.

The standard Devil Red Eye cowl accent panel gives the engine an aggressive look. It can be replaced with an optional Graphite Gray panel to better match the boat.

The V8 250R delivers its performance using readily available 87-octane fuel. Mechanical throttle and shift provide precise, familiar control and make repower projects straightforward. Optional Mercury power steering can further enhance comfort and confidence at high speed.

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The Mercury Racing 400R outboard is designed for boaters who demand maximum torque, top-end power and precise high-speed control. It offers more low-end pull, more peak horsepower and a higher rpm range than any outboard in its category. This makes it a perfect match for performance center-console boats and catamarans that routinely run faster than 75 mph.

QC4 breathing and power

A 5.7L V10 powerhead with Quad Cam Four Valve (QC4) technology sits at the heart of the 400R. Double overhead camshafts and four-valve aluminum cylinder heads allow the engine to breathe deeply at all rpm. A proprietary 92 mm throttle body and tuned intake work with the QC4 heads to maximize airflow and power.

The heavy-duty throttle body servo produces instant throttle response. A Mercury Racing fuel pressure sensor maintains precise fueling during acceleration. The wide 6000–6600 rpm WOT range supports strong peak horsepower and offers a broad window for optimising propeller choice on different hull types.

Racing AMS midsection

The exclusive Racing Advanced MidSection (Racing AMS) supports the V10 with tight-tolerance guide plates and stiff engine mounts. This setup stabilises the engine and improves high-speed handling. An optional integrated rear tie-bar bracket offers a strong and lightweight mounting point for precision steering on catamarans and other ultra-high-speed applications. The Racing AMS also isolates the powerhead from the transom to keep operation smooth and quiet.

Gearcase options for every hull

Two gearcase options let you tailor the 400R to your boat. The race-proven Sport Master gearcase is a surface-piercing design for boats capable of more than 85 mph and features low water pickups with a crescent leading edge for maximum efficiency. The Mercury Racing 5.44 HD gearcase is ideal for heavy bay boats and multi-engine performance center-consoles that need a more submerged gearcase and extra stern lift. Both options use a 1.60:1 gear ratio.

Styling, fuel and controls

Customers can choose Phantom Black or Cold Fusion White, each with Mercury Racing graphics and Devil Red Eye trim. A base Phantom Black version is also available without graphics for custom paint projects. Graphics and an application mask are supplied for installation after painting.

All of this performance is delivered on readily available 87-octane (91 RON) fuel. Digital Throttle & Shift (DTS) provides smooth shifting and precise throttle response, while a high-capacity 150 amp charging system supports modern electronics and onboard systems.

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