Honda 20 HP Electric Start Long Shaft Outboard Marine Engine

The Honda BF 20 DK2 LHSU is a 4-stroke outboard marine engine designed for small fiberglass, aluminum, or inflatable boats requiring a long shaft, measuring 2.5–4.5 meters, with 20 HP / 14.7 kW and a 350 cc 2-Cylinder OHC Carbureted engine. The BF 20 DK2 LHSU, with its 350 cc 2-cylinder OHC engine, offers smoother power delivery and less vibration compared to single-cylinder alternatives.

BF 20 DK2 LHSU Engine Technology and Key Advantages

The 2-cylinder OHC structure reduces vibration and balances power output with more frequent ignition intervals. With a portable weight of 52 KG, it achieves a balanced power-to-weight ratio in this power class.

• 2-Cylinder OHC Carbureted Engine (350 cc, 2-Cylinder): The 2-cylinder OHC structure reduces vibration and balances power output with more frequent ignition intervals.
• Long Shaft (508 mm (20")): Perfect fit for small fiberglass transom heights — propeller operates at optimum depth.
• F–N–R Gear System: Forward, neutral, and reverse — full control in tight spaces, dock, and marina maneuvers.
• Electric Start with Manual Backup: Easy electric start with low battery consumption; more reliable than a fully battery-dependent system.
• Manual Trim: Manually adjust the transom angle — simple and reliable mechanical structure, independent of electricity.
• 12-Liter Internal Tank: Sufficient capacity for medium-distance routes; option for external tank connection for longer voyages.

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 fishing boats, and small 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 2.5–4.5 meter inflatable boats and small boats: 2-cylinder balanced power and low vibration.
• Fishing and lake use: Quiet 4-stroke operation for smooth cruising without disturbing fish.
• Sailboat auxiliary engine: Marina maneuvering and short passage power.
• Backup engine: Portable option as an additional safety solution for larger boats.

Maintenance and Longevity

4-stroke Honda engines run problem-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. After every use in saltwater, freshwater flushing is mandatory.

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

Frequently Asked Questions

What boat size is the Honda 20 HP engine suitable for?

20 HP power is the optimized range for 2.5–4.5 meter inflatable boats and small aluminum boats. The most efficient performance is achieved in boats with a total weight between 200–400 kg.

How does a 2-cylinder OHC engine compare to single-cylinder alternatives?

Two cylinders produce less vibration and smoother power output due to more frequent ignition intervals. This difference is especially noticeable at full throttle positions and against headwind. The 4-stroke design, which does not require an oil-gasoline mixture, ensures low maintenance costs.

How does the Electric Start with Manual Backup system work?

The electric start system engages the starter motor with a turn of the key — the battery load is lower compared to a fully electric system.

Which boat and inflatable boat brands is the BF 20 DK2 LHSU compatible with?

Honda outboard motors are compatible with the vast majority of Zodiac, Ribeye, Highfield, Bombard, Sea Eagle, and domestic brand inflatable boats thanks to their universal transom clamp system. The only criteria are your boat's transom height of 508 mm (20") 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

• Honda Marine Outboard Motors
• Honda Marine Products
• Honda Marine Spare Parts
• 4-Stroke 2.5–30HP Engines
• Outboard Motors
• Boat Engines
• Maintenance Kit
• Impeller
• Engine Oil
• Anode

Is This the Right Configuration for Your Boat?

Share your boat model, transom height, and intended use — let's verify the suitability of the Honda BF 20 DK2 LHSU engine for your boat and ensure the correct shaft selection together.