Mercury 30 HP Rope Start Short Shaft Outboard Motor

The Mercury FourStroke 30 M EFI GA is a 4-stroke outboard marine engine designed for small fiberglass, aluminum, or inflatable boats requiring a short shaft, ranging from 2.5–5 meters, with 30 HP / 22.1 kW and a 500 cc 3-cylinder engine. The FourStroke 30 M EFI GA, with its 500 cc EFI FourStroke engine, offers economical and reliable power to users of small and medium-sized boats.

FourStroke 30 M EFI GA Series Features and Technology Advantages

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

• 3-Cylinder Engine (500 cc): The 3-cylinder structure offers balanced power with a compact and lightweight design
• Short Shaft (381 mm (15")): The propeller operates at optimal depth with the correct transom height
• EFI Electronic Injection: No primer pump required — the fuel system automatically fills before turning the key
• Electric Start: Instant engagement with a key or button — comfortable and fast starting
• Manual Trim: Manually adjust the stern angle — simple and reliable mechanical structure
• 25 Liter Internal Tank: Sufficient capacity for medium-distance routes; option for external tank connection

Short Shaft — What Boat Type Is It Suitable For?

The short shaft (381 mm (15")) is suitable for the transom height of standard inflatable boats, small fiberglass, and aluminum boats. It should not be confused with the long shaft model.

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: light engine weight and balanced thrust
• Spare engine: reliable Mercury service network access

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 rinsing 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 suit different 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 are the advantages of the EFI system 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 oil change every 100 hours or once a season. Impeller check every two seasons. In saltwater use, freshwater rinsing is mandatory after each use. End-of-season fuel system protection is recommended.

What boat and brand types is the FourStroke 30 M EFI GA compatible with?

Mercury outboard motors are compatible with many fiberglass, aluminum, and inflatable boat models thanks to their universal stern clamp or transom mounting system. The only criteria are your boat's 381 mm (15") stern 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 confirm together the suitability of the Mercury FourStroke 30 M EFI GA engine for your boat and the correct shaft selection.