Overview – 40-50HP – Products – Marine – Honda
3x Honda Marine engines.

BF40 - BF50

Triple firepower

Mighty three-cylinder lightweight engines.

The BF40 and BF50 are technologically advanced lightweight outboard engines with excellent power-to-weight ratio, powerful acceleration and impressive fuel-efficiency.

  • Engine


    Trim and tilt

  • Shaft

    S - L


  • Battery


    Charging capacity

  • Dry weight

    96 - 98


Works hard and plays hard

If you’re out fishing or just having fun blasting across the water, you’ll still want the best engine for the job. But which one?

Both the BF40 and the BF50 are lively and responsive outboards that will provide dependable performance for water lovers whichever water they ply. Both are NMEA2000® compliant, electronic fuel injected engines with optional Trolling Control – no differences there – but if you need more power for a bigger boat, then the larger BF50 will be the one for you.

Boat using BF50 engine, being used by model, lake location.

Compact power

The BF40 and the BF50 are light, compact 808cc three-cylinder engines, with strong torque and exciting performance.

How do we do it? By giving them PGM-Fi electronic fuel injection for easy start up, powerful acceleration and outstanding fuel economy. The long, slim inlet manifold and miniaturised electronic components save weight and space, contributing to the compact slim design.

Better performance

Add to that our unique Boosted Low Speed Torque (BLAST™) and the super efficient lean burn control of the ECOmo system, and you’ve got a very impressive combination indeed.

Close up of engine interior.

Trusted technology from our car and motorcycle engines goes into the electronic fuel injection system, delivering better performance and economy.

Boat using Honda engine, being used by models, coastal location.

Fine tuning

Power trim and tilt allows you to find the sweet spot, and tune the boat for better economy and performance.

Pick the right one for your boat

There are two engine choices available to you.

Close up of BF40 engine. BF40 A 40 horsepower 4-stroke three-cylinder engine with short or long shaft, 2.08:1 gear ratio and electric start.
Close up of BF50 engine. BF50 A 50 horsepower 4-stroke three-cylinder engine with short or long shaft, 2.08:1 gear ratio and electric start.

View specifications

It will turn heads

We think something that works beautifully should look great too.

Close up of BF50 engine, coastal location.

The stunning silver finish reflects the colours of its marine surroundings.

The finish is stunning in Honda aqua marine silver. The sleek, sculpted design is liquid smooth. It looks good just fixed to the back of the boat, but in the water – where it really belongs – it looks even better.

Functional design

Both engines have an optional multi-function tiller handle with an LED panel that displays engine alerts, oil pressure, overheating, engine management and battery charging. It also produces an audible warning should anything happen while you’re concentrating on other tasks. It’s unlikely – but if there is an issue, you’ll have time to act. 

Close up of multi-function tiller handle.

Both engines have an optional multi-function tiller handle with an LED panel that visually displays engine alerts.

Close up of Honda engine.

Optional tiller handle has a reversible shift lever, three-stage handle-height and throttle friction adjustment to take the strain off your arms on a long journey.

Slow ahead, and back again

Small adjustments can be made easily, up or down, by 50rpm with trolling control.

Precise control at slow speed is just as important as high-speed handling, especially if you're fishing. The optional Trolling Control will simply adjust the speed through increments of 50rpm - making it ideal for fishing.

Close up of dials, trolling control.

Clear thinking

Believe in what you do.

Improving the quality of our own lives means nothing if we don’t consider the living things around us first. And when it comes to the marine environment, there’s simply no excuse for allowing fuel from boats to pollute our oceans and waterways.

The Honda way

Soichiro Honda had a simple idea to make outboard engines cleaner, quieter and more friendly towards aquatic life – he made them 4-stroke. It was a solution that made Honda pioneers in marine engine technology, but more importantly it made us more responsible towards this fragile environmental resource.

Boat using Honda engine, being used by model, lake location.

Clean, clear water to enjoy whatever your sport may be.

A watertight warranty

Like our engines, a Honda warranty is the best you can get.

Illustration showing Honda's exclusive corrosion protection.

1. A patented double-seal anodising treatment to the aluminium alloy base. 2. An epoxy primer undercoat. 3. An acrylic aqua marine silver paint. 4. An acrylic clear resin topcoat.

The reason is clear: better salt water protection through better anti-corrosion technology and superior servicing with specially trained Honda technicians. Every Honda Marine customer has the support of a domestic or professional warranty, as long as you stick to the service schedule. It will maintain the same value throughout its warranty period. That means your last day of cover is as good as your first. We think that’s pretty unbeatable too.

Four lines of defence

We first anodise the aluminium casing with our patented ‘Double Seal’ process. Then an epoxy primer is applied before the shimmering silver paint. For further protection from UV rays, we apply a clear resin topcoat to finish. And to be doubly sure, a sacrificial anode is fitted so all connectors are waterproof. Corrosion doesn’t stand a chance.

A Honda 6 year domestic use warranty logo, and a Honda 2 year professional use warranty logo.
Boat using BF50 engine, being towed on a trailer, coastal location.

Engine reliability is essential if you live and work on the water.