Mercury 300 HP Racing V8 Outboard Motor with Electro-Hydraulic Steering, Trim Tilt, and Extra Long Shaft

The Mercury Racing 300 XL is a 4-stroke outboard marine engine designed for high-speed performance boats, race boats, and offshore sport boats that require an extra-long shaft. It features a 300 HP / 224 kW and 4600 cc V8 (8 Cylinder) engine. The Racing series is Mercury's high-performance oriented outboard engine line. With a naturally aspirated high-performance engine and Racing ECU calibration, it aims for maximum power and speed.

Racing 300 XL Series Features and Technology Advantages

High-performance ECU calibration extends the optimum power band compared to standard FourStroke engines. Precise maneuvering control at high speeds is provided by the AMS electro-hydraulic steering.

• V8 (8 Cylinder) Engine (4600 cc): High-performance ECU calibration extends the optimum power band compared to standard FourStroke engines
• Extra Long Shaft (572 mm (22.5")): The propeller operates at optimal depth with the correct transom height
• High-Performance ECU: Extended power band with Racing calibration
• Electric Start: Instant engagement with a key or button — comfortable and quick starting
• Power Trim & Tilt: Adjust trim angle with a button while cruising — optimizes fuel efficiency; fully raise the engine with tilt
• External Fuel System with Float: Large capacity external tank connection — range determined by user needs

Extra Long Shaft — Which Boat Type is it Suitable For?

The extra-long shaft (572 mm (22.5")) allows the propeller to operate at the correct water depth in large fiberglass and aluminum boats with high freeboards. It is 64 mm longer than the standard long shaft (508 mm).

Technical Specifications

Who is This Engine For?

• High-speed performance boats: Maximum speed with Racing performance configuration
• Offshore racing and sport boats: Precise maneuvering at high speeds with AMS electro-hydraulic system
• Multi-engine speed-focused configuration: Coordinated power with DTS synchronization
• Speed record and sport performance targets: Mercury Racing engineering

Maintenance and Longevity

4-stroke Mercury engines operate trouble-free for many years with regular oil changes and end-of-season maintenance protocols. Impeller inspection for the water-cooled system should be done every 100 hours or every two seasons. Fresh water flushing is mandatory after every use in saltwater.

Related maintenance categories: Maintenance Kit | Engine Oil | Impeller | Mercury Spare Parts

Frequently Asked Questions

What type of boat is the Mercury Racing 300 HP HP engine suitable for?

The Racing series, with 300 HP HP of power, is developed for speed-oriented performance boats. It provides maximum performance in offshore race boats, catamarans, and high-speed sport boats. Weight optimization and power density are priorities in this segment.

How does a High-Performance Mercury Racing engine work?

The High-Performance ECU uses different injection timing and ignition maps compared to standard FourStroke engines. The power band is optimized for high RPMs.

How is the Racing series maintained?

Racing engines require a special maintenance protocol suitable for high-performance use. Beginning and end-of-season services should be performed at authorized Mercury service centers. Oil quality and change intervals may be more frequent than for standard FourStroke engines.

Which boat and brand types are compatible with the Racing 300 XL?

Mercury outboard motors are compatible with many fiberglass, aluminum, and inflatable boat models due to their universal transom clamp or transom mounting system. The only criteria are your boat's transom height of 572 mm (22.5") and the maximum engine power approved by the manufacturer. You can share your boat model to get compatibility confirmation from Clever Marin.

Related Products and Categories

• Mercury Outboard Motors
• Mercury Marine Products
• Mercury Spare Parts
• Mercury Racing 150–300 HP
• Mercury Racing 350–500 HP
• Outboard Motors
• Boat Engines
• Maintenance Kit
• Impeller
• Anode

Is This the Right Configuration for Your Boat?

Share your boat model, transom height, and intended use — let's verify together if the Mercury Racing 300 XL engine is suitable for your boat and ensure the correct shaft selection.