Mercury 30 HP Rope Start Long Shaft Outboard Motor

The Mercury FourStroke 30 ML EFI GA is a 4-stroke outboard marine engine designed for small fiberglass, aluminum, or inflatable boats, 2.5–5 meters in length, that require a long shaft. It features 30 HP / 22.1 kW and a 500 cc 3-cylinder engine. The FourStroke 30 ML EFI GA with its 500 cc EFI FourStroke engine offers economical and reliable power to small and medium-sized boat users.

FourStroke 30 ML EFI GA Series Features and Technology Advantages

The 3-cylinder structure provides balanced power with a compact and lightweight design. EFI injection ensures reliable starting without requiring a manual fuel system.

• 3-Cylinder Engine (500 cc): The 3-cylinder structure provides balanced power with a compact and lightweight design
• Long Shaft (508 mm (20")): Propeller operates at optimal depth with correct transom height
• EFI Electronic Injection: No primer pump required — automatic fuel system fill before turning the key
• Electric Start: Instant activation with key or button — comfortable and quick starting
• Manual Trim: Manual adjustment of transom angle — simple and reliable mechanical structure
• 25 Liter Internal Tank: Sufficient capacity for medium-distance routes; option for external tank connection

Long Shaft — What Type of Boat Is It Suitable For?

The long shaft (508 mm (20")) is suitable for the vast majority of inflatable, aluminum, 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?

• 2.5–5 meter small and medium-sized boats: economical EFI power
• Fishing and coastal use: quiet 4-stroke operation
• Inflatable boats and RIBs: lightweight engine and balanced thrust
• Auxiliary engine: reliable access to Mercury service network

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. 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 30 HP engine suitable for?

30 HP power can fit various 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 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 checked every two seasons. Freshwater flush is mandatory after each use in saltwater. Fuel system protection is recommended at the end of the season.

Which boat brands are compatible with the FourStroke 30 ML EFI GA?

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 get compatibility confirmation from Clever Marin by sharing your boat model.

Related Products and Categories

• Mercury Outboard Motors
• Mercury Marine Products
• Mercury Spare Parts
• Mercury 2.5–30 HP FourStroke
• Mercury 40–60 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 30 ML EFI GA engine is suitable for your boat and confirm the correct shaft selection.