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.
World-renowned Honda quality combines proven reliability and superior fuel efficiency, with no oil mixing.
NMEA 2000 protocols allow engine data to be displayed on NMEA 2000 compliant dashboard electronics, like sonar and GPS.
Lean Burn Control® increases fuel efficiency by allowing combustion to operate on a leaner air/fuel mixture. At cruising speed, this engine runs on as much as 20% less fuel* than others in its class.
*Based on the EPA's Specific Fuel Consumption Mode.
Boosted Low Speed Torque, or BLAST, improves acceleration at low speeds. A quick movement of the throttle control activates the BLAST® system, advancing the ignition curve aggressively. "Hole Shot" is vastly improved as more horsepower gets the hull up on plane quicker.Learn More
Programmed Fuel Injection delivers the precise amount of fuel/air to each cylinder. The result is easy starts and instant throttle response with superior fuel efficiency.
There's always plenty of electric power with the 40 and 50hp. Honda’s innovative technology enables these engines to put out nearly twice as many charging amps as the competition’s.Learn More
Designed to get you going faster, the BF40 and 50's gearcase reduces drag, greatly reduces hull porpoise and minimizes spray, thus increasing acceleration and top speed.
Adjusts to a comfortable angle for easiest hull manueverability.
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.
Tiller models feature a new 4-lamp warning system built into the tiller handle, while remote control models deliver alerts via messages through Honda’s multi-function digital gauges or a special indicator built into the unit’s control box.
A patented, "Double Sealed" multi-layered paint process. Sacrificial anodes and stainless steel technology, along with waterproof connectors, all enhance corrosion protection.Learn More
Because of Honda’s elegant design, the BF40 and 50 are the lightest engines in their class. Perfect for aluminum boats, inflatables, skiffs and flats boats.
Environmentally conscious technology. All Honda Marine engines exceed the highest CARB 3-Star rating to meet the rigorous California Air Resource Board's standards.
Honda's True 5 Warranty is the best in the business. This transferable, non-declining warranty is the same on the first day as it is on the last.Learn More
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.
Allows you to trim the unit for maximum performance and handling.
Trim Range: - 4° to +16°
Tilt Range: 63°
Honda's exclusive crankshaft design locates the powerhead directly over the transom pivot point. This has two effects. It reduces vibration and improves performance and handling. It also provides for a very compact design.
Easy access side-mounted oil filter and oil fillers simplify maintenance, while "screw-type" valve adjusters reduce maintenance costs.
Patented non-linear rubber mounts provide smoother operation at all engine speeds.
The lightweight Mikuni long tube intake track system helps build low end torque.
Fishermen will appreciate the low trolling speed of the BF40 and 50.
Built-in pitot tube in the gear case eliminates the need to drill holes in your boat for installation.
|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|
|Exhaust||Through Hub||Through Hub|
|Lubrication||Wet Sump||Wet Sump|
|Trim Range||-4° to +16°||-4° to +16°|
|Alternator with voltage regulator (Electric Start)||22-Amp (275 watt)||22-Amp (275 watt)|
|Battery Charging Power||17 Amps||17 Amps|
|Power Trim & Tilt||Available||Available|
|Gas Assisted Tilt||Available||Available|
|Oil Pressure Alert||Standard||Standard|
|Overall Width||372 mm/14.7 inches||372 mm/14.7 inches|
|L Type||508 mm/20 inches||508 mm/20 inches|
|X Type||NA||635 mm/25 inches|
|L-Type||97 kg/214 lbs.||97 kg/214 lbs.|
|X-Type||NA||101 kg/223 lbs.|
|Manuals by Serial Range|
|Manuals by Serial Range|