Mercury 225 HP Outboard Motor with Starter, Steering, Trim and Tilt, Long Shaft

The Mercury FourStroke 225 L is a 4-stroke outboard marine engine designed for medium and large fiberglass, aluminum, or composite boats that require a long shaft. It features 225 HP / 165 kW and a 3400 cc V6 (6 Cylinder) engine. The FourStroke 225 L, with its 3400 cc V6 EFI FourStroke engine, offers a balance of high power and fuel efficiency for large boats. This model, part of Mercury's main production line, stands out with its extensive service network and reliability advantage.

FourStroke 225 L Series Features and Technology Advantages

The V6 engine provides a wide power band and EFI electronic injection, offering high torque at low RPMs and stable power at high RPMs. The stainless steel propeller and external fuel system are suitable for large boat use.

• V6 (6 Cylinder) Engine (3400 cc): The V6 engine provides a wide power band and EFI electronic injection, offering high torque at low RPMs and stable power at high RPMs.
• Long Shaft (508 mm (20")): The propeller operates at optimal depth with the correct transom height.
• EFI Electronic Injection: Easy cold-weather starting and consistent power output across the entire RPM range.
• Electric Start: Instant activation with a key or button — comfortable and fast starting.
• Electric Trim and Tilt (Power Trim & Tilt): Adjust trim angle with a button while cruising — optimizes fuel efficiency; tilt raises the engine completely.
• External Floating Fuel System: Connection for large-capacity external tank — range determined by user need.

Long Shaft — Which Boat Type Is It Suitable For?

The long shaft (508 mm (20")) is suitable for the vast majority of inflatable boats, aluminum boats, and fiberglass boat models. For boats with a transom height of 381 mm, a short shaft model should be preferred.

Technical Specifications

Who Is This Engine For?

• Primary engine for large fiberglass and composite boats: high power and stainless steel propeller combination
• Long-distance offshore routes: EFI efficiency and external fuel system
• Twin engine configuration: synchronized power with same series engines
• Fishing and cruising use: low maintenance cost and extensive service network

Maintenance and Longevity

4-stroke Mercury engines operate smoothly 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. In saltwater use, freshwater flushing is mandatory after each use.

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

Frequently Asked Questions

What boat size is the Mercury FourStroke 225 HP engine suitable for?

225 HP power can fit various boat sizes depending on boat weight and type. General rule: 15–20 kg boat weight per HP. Always check the maximum engine power recommended by the boat manufacturer.

What advantage does the EFI system offer over a carbureted engine?

EFI (Electronic Fuel Injection) does not require a primer pump or choke adjustment. It provides reliable starting in cold weather and at high altitudes, consistent power output, and lower fuel consumption compared to carbureted alternatives.

What are the Mercury FourStroke maintenance intervals?

Oil change at the first 20 hours, then every 100 hours or once a season. Impeller check every two seasons. In saltwater use, freshwater flushing is mandatory after each use. End-of-season fuel system protection is recommended.

Which boat and inflatable boat brands are compatible with the FourStroke 225 L?

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 508 mm (20") transom height 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 175–300 HP FourStroke
• Mercury 75–150 HP FourStroke
• 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 FourStroke 225 L engine is suitable for your boat and ensure the correct shaft selection.