Mercury 400 HP Racing V10 Electro-Hydraulic Steering Trim Tilt Ultra Long Shaft Outboard Engine

The Mercury Racing 400 XXL AMS DTS V10 is a 4-stroke outboard marine engine designed for high-speed performance boats, race boats, and offshore sport boats that require an ultra-long shaft. It features 350 HP / 257 kW and a 5700 cc V10 (10-cylinder) engine. The Racing series is Mercury's high-performance focused outboard engine group. With its naturally aspirated high-performance engine and Racing ECU calibration, maximum power and speed are targeted.

Racing 400 XXL AMS DTS V10 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 AMS electro-hydraulic steering.

• V10 (10-Cylinder) Engine (5700 cc): High-performance ECU calibration extends the optimum power band compared to standard FourStroke engines.
• Ultra-Long Shaft (635 mm (25")): The propeller operates at an optimum depth with the correct transom height.
• High-Performance ECU: Extended power band with Racing calibration.
• Electric Start: Instant activation with a key or button — comfortable and quick starting.
• Power Trim & Tilt: Adjust the trim angle during navigation with a button — optimizes fuel efficiency; fully raise the engine with tilt.
• External Fuel System with Float: Connection for a large-capacity external tank — range determined by user needs.

Ultra-Long Shaft — Suitable for Which Boat Type?

The ultra-long shaft (635 mm (25")) keeps the propeller at an optimum depth on large yachts and professional boats with deep transom designs. Incorrect shaft selection will leave the propeller out of the water or drag the bottom — measure the transom height before installation.

Technical Specifications

Who Is This Engine For?

• High-speed performance boat: Maximum speed with Racing performance configuration.
• Offshore race and sport boat: Precise maneuvering at high speeds with the AMS electro-hydraulic system.
• Multi-engine speed-focused configuration: Coordinated power with DTS synchronization.
• Speed record and sport performance goals: 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. The impeller of the water-cooled system should be checked 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

Which boat type is the Mercury Racing 350 HP engine suitable for?

The Racing series, with 350 HP, is developed for speed-oriented performance boats. It provides maximum performance on offshore race boats, catamarans, and high-speed sport boats. Weight optimization and power density are priorities for 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 models are compatible with the Racing 400 XXL AMS DTS V10?

Mercury outboard motors are compatible with many fiberglass, aluminum, and inflatable boat models thanks to their universal transom clamp or transom mounting system. The only criteria are your boat's 635 mm (25") transom height and the maximum engine power approved by the manufacturer. You can confirm compatibility with Clever Marin by sharing your boat model.

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 confirm the suitability of the Mercury Racing 400 XXL AMS DTS V10 engine for your boat and the correct shaft selection together.