Honda 20 HP Long Shaft Outboard Motor with Steering, Electric Start, and Power Trim & Tilt

The Honda BF 20 DK3 LRTU is a 4-stroke outboard marine engine designed for small fiberglass, aluminum, or inflatable boats (2.5–4.5 meters) that require a long shaft. It features a 20 HP / 14.7 kW, 350 cc, 2-cylinder OHC carbureted engine. With its 350 cc 2-cylinder OHC engine, the BF 20 DK3 LRTU offers smoother power delivery and less vibration compared to single-cylinder alternatives.

BF 20 DK3 LRTU Engine Technology and Key Advantages

The 2-cylinder OHC design reduces vibration and balances power output with a more frequent firing interval. With a portable weight of 58.5 KG, it provides a balanced power-to-weight ratio in this power class.

• 2-Cylinder OHC Carbureted Engine (350 cc, 2 Cylinders): The 2-cylinder OHC structure reduces vibration and balances power output with a more frequent firing interval.
• Long Shaft (508 mm (20")): Perfectly suited for small fiberglass transom heights — the propeller operates at an optimal depth.
• F–N–R Gear System: Forward, neutral, and reverse — full control during maneuvers in tight spaces, at docks, and in marinas.
• Electric Start: Instant activation with a key or button — comfortable and fast starting.
• Electric Trim and Tilt: Adjust trim angle with a button — optimizes fuel efficiency and speed during cruising; possibility to fully lift the engine with tilt.
• 12-Liter Internal Tank: Sufficient capacity for medium-distance routes; option for external tank connection for longer voyages.

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

The long shaft (508 mm (20")) is suitable for most 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 operation of a 4-stroke engine allows cruising without scaring fish.
• Sailboat auxiliary engine: Power for marina maneuvers and short passages.
• Backup engine: Portable option as an additional safety solution for large 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. Fresh water flushing is mandatory after every use in saltwater.

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 an optimized range for 2.5–4.5 meter inflatable boats and small aluminum boats. The most efficient performance is achieved on boats with a total weight between 200–400 kg.

How much better is a 2-cylinder OHC engine compared to single-cylinder alternatives?

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

How does the electric start system work?

Electric start instantly activates the engine with the turn of a key. It requires a battery connection.

Which boat and boat brands is the BF 20 DK3 LRTU compatible with?

Honda outboard motors are compatible with most Zodiac, Ribeye, Highfield, Bombard, Sea Eagle, and local 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 2.5–30 HP 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 confirm together the suitability of the Honda BF 20 DK3 LRTU engine for your boat and the correct shaft selection.