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BF20 Honda Marine Engine

BF20 Honda Marine Engine
The BF20 delivers unrivalled innovation to the portable range. Powerful, efficient and clean operation


Performance and Efficiency

4-Stroke Design

World-renowned Honda quality combines proven reliability and superior fuel efficiency, with no oil mixing.

Available with Power Thrust Design (BFP) - better performance

The 10" x 7 5/8" Power Thrust 4-blade propeller creates 60% more thrust in reverse and 15% more in forward. The result? Improved maneuverability and performance.

Reverse Exhause Relief - increased manueverability (BFP models)

The exhaust relief feature creates more power in reverse by minimizing cavitation around the propeller blades. The exhaust relief is located above the cavitation plate, allowing the prop to run in clean, exhaust-free water.

Large Displacement

At 21.4 cubic inches, the 20hp has one of the largest displacements in its class. Along with the long-stroke design, this provides optimum torque throughout the RPM range.

Easy One Hand Starting

A built-in decompression release and digital CDI system set the BF20’s ignition timing. This reduces the effort required to pull-start the engine by hand by 40%!

Power Tilt

Conveniently allows user to tilt the unit out of the water. At low speeds, Power Tilt acts like a power shallow-water-drive device, permitting access to the shallow water areas.

Auto Start Enrichment - easy starts

Auto Start Enrichment acts as an automatic choke. Just like a fuel injection system, it automatically adjusts the air/fuel mixture for quick, easy starting and warm-up.

Pendulum Mount System

Honda's exclusive triangulated rubber mount system absorbs vibration and provides unbelievably smooth operation.

EZ Steer Friction Control

A unique lever design allows you to precisely adjust steering tension for improved control and comfort.

3 Stage Carburetion

Conventional 2-circuit carburetors go directly from a lean mixture at idle to a rich setting at full throttle. The BF20 adds a third stage for better economy and smoother operation.

PGM Ignition

A reliable microprocessor accurately controls ignition timing during start-up and across the entire RPM range, providing optimum overall operation.

Shallow Water Drive

An innovative shallow water drive feature lets you tilt the motor up, allowing you to easily operate in shallow areas. Shallow water drive greatly reduces the risk of engine damage.

Reliability and Durability

Engine Alert System - Keeps you informed

The integrated warning system protects the engine from severe damage due to low oil, over-revving and overheating.

4-Front Corrosion Protection System - Fights the elements

A patented, "Double Sealed" multi-layered paint process. Sacrificial anodes and stainless steel technology, along with waterproof connectors, all enhance corrosion protection.

Positive Lubrication

A crankshaft-driven, automotive-style trochoid oil pump ensures long-term durability of critical engine components.

Ultra Low 3 Star CARB Emissions

Environmentally conscious technology. All Honda Marine engines exceed the highest CARB 3-Star rating to meet the rigorous California Air Resource Board's standards.

Convenience and Ease of Use

Lightweight Design

The lightest 4-stroke model in its class, the BF20 is easy to transport and convenient to mount.

High Output Charging

The BF20 provides 2 Amps at 1000 RPM and an amazing 12 amps at only 3000 RPM. This helps to maintain the battery charge or keep electronics going - even at trolling speeds.

Integrated Carrying Handle

The integrated carrying handle make transporting the engine a breeze. A convenient, foldaway carry handle is situated at the exact top/bottom balance point of the engine. This means the engine carries more easily in a level position.

Longer Tiller Handle

A convenient longer tiller handle improves control and reduced steering effort. The extended handle is made of a lightweight composite, increasing its durability while decreasing the motor's weight.

Up Front Tiller Controls

A convenient front-mounted shift lever allows fingertip shifting. The Twist Grip Throttle & Tensioner minimize driver fatigue.

Available in both 15 and 20 inch shaft models



Type 4-Stroke SOHC 2 Cylinder/4 Valves
Displacement 350 cc (21.5 cubic inches)
Bore & Stroke 59 mm x 64 mm (2.3 x 2.5 inches)
Full Throttle RPM Range 5,000-6,000 RPM
Rated Power 20 HP @ 5,500 RPM
Cooling System Water Cooled
Fuel Delivery 1 Carburetor
Ignition System PGM-IG
Starting System Electric/Recoil
Exhaust Through Hub
Lubrication Wet Sump
Trim Range 4 Stage 8°-12°-16°-20°
Tilt Range 72°


Gear Ratio 2.08:1
Gear Shift F-N-R


Alternator with voltage regulator (Electric Start) 12-Amp (151 watt)
Alternator with voltage regulator (Manual Start) 6-Amp (76 watt)
Propeller 4-Blade Aluminum
Diameter x Pitch, Standard 9¼ x 10 inches
Diameter x Pitch, Power Thrust 10 x 75/8 inches
Power Tilt Available
Oil Pressure Alert Standard
Temperature Alert Standard
Rev-Limiter Standard


Overall Width 350 mm/13.8 inches

Dry Weight

S-Type 47 kg/104 lbs.
L-Type 50 kg/110 lbs.

Transom Height

S Type 381 mm/15 inches
L Type 508 mm/20 inches


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