Honda BF25

Honda's 25 HP, 4-stroke BF25 marine outboard engine has a powerful 3-cylinder design for maximum torque. The convenient Auto-Start Enrichment automatically adjusts the air-fuel mixture for quick, easy starts and warm up. Like the 30 / 40 / 50 HP, the 25 features a new center mount tiller handle for ease of operation and control. And it's available with an all new power trim and tilt system.


Type4-Stroke OHC Twin Cylinders
Displacement552 cc (33.7 cubic inches)
Bore & Stroke61 x 63 mm (2.4 x 2.48 inches)
Full Throttle RPM Range5000-6000 RPM
HP Rating @ Propshaft25HP @ 5500 RPM
Induction ScavengingSOHC
Valves per Cylinder2
Fuel Delivery3 Venturi
Ignition SystemProgrammed Ignition System
Starting SystemElectric
LubricationWet Sump
Cooling SystemWater Cooled
AlternatorElectric 10 Amps (126 Watts)
Trim Range-4° to +12°
Tilt Range64°
Gear Ratio2.08:1 (13/27)
Gear ShiftF-N-R
Propeller91/4 x 12 inches (3 Blade Aluminum)
Recommended Transom Height(S) 381 mm/15 inches
Dry Weight(S/L) 70.5/72.5 kg - 155/160 lbs.


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

New Increased Displacement For More Power
Displacement on the 25HP and 30HP have been increased to 552 cc (33.7 cubic inches), providing 4% more torque in midrange operation.

Center Mount Tiller
New ergonomically designed tiller handle is 8" longer and angled 5" higher for improved handling. Adjustments for throttle and steering friction allow easier control. Up-front shift, PTT switch, and engine alert lamps provide added convenience.

3 to 3 Induction
A lightweight, compact 3-cylinder, 3-carburetor design utilizes one carburetor per cylinder. This design is more responsive than competitive throttle bodies with long intake runners.

The result-smooth, quiet operation, along with instant throttle response and performance.

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
On electric start models, automatically adjusts the air-fuel mixture for quick, easy starting and warm-up.

Non-Linear Mounting System
Patented non-linear rubber mounts provide smoother operation at all engine speeds.

Positive Lubrication
A crankshaft-driven, automotive-style trochoid oil pump ensures critical engine component long-term durability.

Engine Alert System
Uses visual, audio and RPM reduction circuits to alert the operator of overheating, low oil PSI and over-revving, preventing engine damage.

Forced Air Ventilation
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.

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

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.

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

Fresh Water Flushport
Flushes debris and saltwater out of the engine, extending the life of the outboard.

Easy Maintenance
Easy "screw-type" valve adjuster system requires no shims and reduces maintenance costs. Front-mounted oil filter and oil filler make for easy maintenance.

Built-In Pilot Tube
Built-in pilot tube in the gear case eliminates the need to drill holes in your boat for installation.

Gas Assist Tilt
Power tilt function makes it easy to tilt the engine for running in shallow water, or raise it completely out of the water for protection.

Forward Mounted Shift Lever
Provides easy access to the forward-mounted controls.

Power Trim/Tilt
Allows user to trim the unit for maximum performance and handling.
Trim Range: - 4° to +12°
Tilt Range: 67°

Ultra Low 3 Star Carb Emissions
Environmentally friendly technology.

ID: 945

Honda BF25 Dealers:

International > North America > USA > No dealers listed.

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