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BF25 Honda Marine Engine

BF25 Honda Marine Engine
Ample power with exceptional torque through the mid-range, the fuel efficiency of the BF25 will ensure the engine pays for itself


Performance and Efficiency

4-Stroke Design

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

Increased Displacement For More Power

The BF25 has the largest displacement in its class, at 552 cc (33.7 cubic inches), providing more torque in midrange operation.

3 to 3 Induction

3 to 3 induction provides smooth, quiet operation, along with instant throttle response and performance. A compact 3-cylinder, 3-carburetor design utilizes one carburetor per cylinder. This design is more responsive than competitive throttle bodies with long intake runners.

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PGM Ignition

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

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.

Non-Linear Mounting System - smoother operation

Patented non-linear rubber mounts provide smoother operation at all engine speeds.

3 Inlet Cooling

Provides plenty of water to maintain optimum engine temperature in all conditions.

Reliability and Durability

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.

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Engine Alert System - Keeps you informed

Audio and visual cues combine with RPM reduction circuits to alert the operator of overheating, low oil PSI, and over-revving to prevent engine damage.

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Forced Air Ventilation

A unique air intake on the top of the cowl allows cooler air to enter and warmer air to escape. The ventilation system reduces under-the-hood operating temperature, improving performance and long-term durability of the electrical components.

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

Center Mount Tiller - Easier control

The ergonomically designed tiller handle is longer for improved handling. Adjustments for throttle and steering friction allow easier control. Up front shift lever, PTT switch, and engine alert lamps provide added convenience.

Regulated Charging System

A rectifier/regulator is standard on both manual and electric-start models. On manual models, you have the convenience of 4 Amps to charge the battery, and on electric-start models, a high-output 10 Amp system.

Gas Assist Tilt

Acting much like a pressure strut on a car's trunk lid, the gas-filled cylinder makes it easy to tilt the engine for running in shallow water, or to raise it completely out of the water for protection.

Power Trim/Tilt

Allows you to trim the unit for maximum performance and handling. Trim Range: - 4° to +12°, Tilt Range: 64°

Easy Maintenance

The port-mounted oil filter and oil fillers simplify maintenance. Easy "screw-type" valve adjusters require no shims, reducing maintenance costs.

Built-In Pitot Tube

A built-in pitot tube in the gear case eliminates the need to drill holes in your boat for installation.

Forward Mounted Shift Lever

Provides easy access to the forward-mounted controls.

Available in 15 and 20 inch shaft models



Type 4-Stroke SOHC 3 Cylinder - 2 Valves/ Cyl.
Displacement 552 cc (33.7 cubic inches)
Bore & Stroke 61 mm x 63 mm (2.4 x 2.5 inches)
Full Throttle RPM Range 5,000-6,000 RPM
Rated Power 25 HP @ 5,500 RPM
Cooling System Water Cooled
Fuel Delivery 3 Carburetors
Ignition System PGM-IG
Starting System Electric
Exhaust Through Hub
Lubrication Wet Sump
Trim Range -4° to +12°
Tilt Range 64°


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


Alternator with voltage regulator (Electric Start) 10-Amp (126 watt)
Propeller 3-Blade Aluminum
Diameter x Pitch 9¼ x 12 inches
Power Tilt NA
Power Trim & Tilt Available
Gas Assisted Tilt Available
Oil Pressure Alert Standard
Temperature Alert Standard
Rev-Limiter Standard


Overall Width 375 mm/14.8 inches

Dry Weight

S-Type 70.5 kg/155 lbs.
L-Type 72.5 kg/160 lbs.

Transom Height

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


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