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2006 Honda BF40

The uniquely compact, durable design of the 40 HP, 4-stroke, Honda BF40 outboard engine keeps it running smooth and powerful year after year. And just like fuel injection, the Autostart enrichment automatically adjusts the air-fuel mixture for quick, easy starts and warm up. A fuel-efficient 3-to-3 induction feature saves space and weight.


BuilderHonda Marine
Type4-Stroke OHC 3 Cylinders
Displacement808 cc (49.3 cubic inches)
Bore & Stroke70 x 70 mm (2.76 x 2.76 inches)
Full Throttle RPM Range5000-6000 RPM
HP Rating @ Propshaft40HP @ 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 Range67
Gear Ratio2.08:1 (26/33 x 14/23)
Gear ShiftF-N-R
Recommended Transom Height(L) 508 mm/20 inches
Dry Weight(L) 96.5 kg - 212 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.

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

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

Offset Crankshaft Design
A Honda first - locates the powerhead directly over the transom pivot point, which reduces vibration. Also increases the performance and handling characteristics of the hull. Benefit: Reduced vibration with improved handling and hull maneuverability.

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
Just like a fuel injection system, autostart enrichment 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.

High Output Charging System
Standard 10 Amp charging ensures that batteries remain charged while operating electronics.

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.

ID: 966

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