Honda BF40 BF50 Outboards

The BF40 and BF50 are an outstanding combination of Honda’s legendary four-stroke engineering and our latest outboard innovations. The result? The lightest, most compact engines in their class. And because they are from Honda, they’re loaded with the unparalleled features and technology you want.

Like BLAST (Boosted Low Speed Torque). It’s activated by a quick movement of the throttle for vastly improved hole shots. Programmed Electronic Fuel Injection, for easy starts, instant throttle response, slower trolling speeds, and overall better fuel economy. Lean Burn Control stretches your gas even further by allowing a leaner air-to-fuel mixture.

Put it all together, and you’ll l find that the BF40 and BF50 aren’t just at the head of the class. They’re in a class by themselves, redefining mid-range four-stroke performance.


BF40 BF50
Type 4-Stroke SOHC, 3 Cylinder, 2 Valves/Cyl. 4-Stroke SOHC, 3 Cylinder, 2 Valves/Cyl.
Displacement 808 cc (49.4 cubic inches) 808 cc (49.3 cubic inches)
Bore & Stroke 70 mm x 70 mm (2.8 x 2.8 inches) 70 mm x 70 mm (2.8 x 2.8 inches)
Full Throttle RPM Range 5,000-6,000 RPM 5,500-6,000 RPM
Rated Power 40 HP @ 5,500 RPM 50 HP @ 6,000 RPM
Cooling System Water Cooled Water Cooled
Fuel Delivery Programmed Fuel Injection Programmed Fuel Injection
Ignition System MicroComputer Programmed MicroComputer Programmed
Starting System Electric Electric
Exhaust Through Hub Through Hub
Lubrication Wet Sump Wet Sump
Trim Range -4° to +16° -4° to +16°
Tilt Range 63° 63°


BF40 BF50
Gear Ratio 2.08:1 2.08:1
Gear Shift F-N-R F-N-R


BF40 BF50
Alternator with voltage regulator (Electric Start) 22-Amp (275 watt) 22-Amp (275 watt)
Battery Charging Power 17 Amps 17 Amps
Propeller Optional Optional
Power Tilt NA NA
Power Trim & Tilt Available Available
Gas Assisted Tilt Available Available
Oil Pressure Alert Standard Standard
Temperature Alert Standard Standard
Rev-Limiter Standard Standard
Speedometer Pickup Standard Standard


BF40 BF50
Overall Width 372 mm/14.7 inches 372 mm/14.7 inches

Transom Height

BF40 BF50
L Type 508 mm/20 inches 508 mm/20 inches
X Type NA 635 mm/25 inches

Dry Weight

BF40 BF50
L-Type 97 kg/214 lbs. 97 kg/214 lbs.
X-Type NA 101 kg/223 lbs.


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