3x Honda Marine engines.

BF80 - BF100

A powerful partnership

The road meets the wave. Here’s an engine that’s a seamless blend of marine and automotive technology.

Underneath that slim and sleek design is a four-cylinder 4-stroke engine with PGM-Fi fuel injection and a host of unique innovations – many developed by our automotive division – that make them class leaders and firm favourites with boating enthusiasts everywhere.

Close up of four cylinder engine.

The formula one kick

Honda's unique Variable Valve Timing and Electronic Control gives you the best power and performance.

Boat using BF100 engine, being used by models, coastal location.

When VTEC™ kicks in you'll hear it as well as feel it.

We call it VTEC™. It’s a fuel efficient system that not only saves you money, but produces an exhilarating rush of power. First used in the Honda Formula One race car, it delivers more power and torque at all speeds. It works by using two different cams in the BF100:

1: When the engine is running at lower rpm, the valves are operated by a less aggressive cam which provides smooth and fuel-efficient performance.

2: When you want more power as the revs increase to 4,500, VTEC™ hydraulically engages a cam with high lift profile. This enables the valves to stay open longer, allowing more air into the combustion chamber to produce optimum power – like a Formula One racing car. At this point the engine takes on an entirely different personality; you’ll hear it as well as feel it.

Illustration of VTEC™.

Blast off

That's how it feels from the word 'go'.

Sometimes called hole shot technology, BLAST™ gets your boat up on to the plane in just a few seconds. BLAST™ stands for Boosted Low Speed Torque and gives you that powerful lift you need, right from the off.

How do we do it?

The ECU automatically advances the ignition timing, and at the same time the fuel-to-
air ratio is increased to give you more thrust from low down. This pioneering patented technology for Honda 4-stroke motors has become the benchmark in our engine design.

Boat using BF80 engine, coastal location.

Keeping a cool head

This unique engine cooling system works three ways for superior performance.

Honda’s three-way cooling system keeps the exhaust manifold (1) and cylinder head (2) running cooler than the cylinder block (3). Controlled by two separate thermostats, this innovative technology provides more horsepower, superior cooling and excellent fuel efficiency.

Top performance at every speed

Honda’s dual-stage air induction works with a shuttle-valve built into the Variable Air Intake (VAI) manifold. When fully open, this valve changes the resonance and airflow for more torque at low revs. When you crack open the throttle and the revs increase, the valve closes and creates a more direct airflow to the engine. This delivers more horsepower above 3500rpm. Combined with BLAST™, it’s like being shot out of a cannon.

Boat using BF80 engine, being used by models, coastal location.
Illustration of cooling system.

Super cool

The engine runs at two different temperatures delivering exceptional performance.

Controlling the economy

Our special lean-burn control ECOmo system can really save you lots of money on fuel – right through the rev and performance range.

Fact: once you’re up on the plane you use less fuel. But it’s finding that sweet spot and keeping it there that actually gives you the best result. Once you're settled at cruising speed, ECOmo will automatically adjust the correct air-to-fuel ratio for that speed – clever. Normally it operates in the green area (illustrated on the dial) or when the green Eco light comes on if you have multi-functional gauges. So once you’re in the green, you’ll be saving up to 20% of your fuel. And on a long trip, that’s a lot of cruising.

Close up of control ECOmo system.

Lean burn control (ECOmo) regulates air-fuel mixture for better fuel consumption. When your boat is up on the plane and cruising (the green area illustrated above) it will add more air to the fuel, making the mixture leaner.

Close up of control ECOmo system.

When the Eco light is green you're cruising in the 'sweet-spot' saving fuel and money.

Plug and play

When the water is your playground, you’ll feel completely connected to your surroundings – whatever you’re doing.

The BF80 and BF100 are NMEA2000® compliant. No need to rewire anything because everything fits. Simply plug the engine into the CANbus network – the boat’s nervous system – for total connectivity and complete control. Then the engine can be linked to other NMEA devices like navigation, GPS, sonar devices, fishfinders and chart plotters. All the information including engine data will be displayed via the multi-functional gauges. It’s like having a good First Mate or Chief Officer on board, 24/7.

Illustration of boat, focusing on NMEA2000®.

No special tools needed – the NMEA2000® cable connectors are simple to plug in.

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 at sea, on a river or lake. Small up or down adjustments to the engine RPM can be easilly performed with the optional Trolling Control.

Close up of dials, trolling control.

Worth a good look

You’re always in the know with the multi-functional Honda Speedometer and Tachometer gauges.

These gauges are fully NMEA2000® compliant; just plug them in, set them up and you’re on your way. They give you engine information like temperature, how much fuel has been used and tank level – it's all there, right in front of you. So no excuses for forgetting to fill up your tank now… 

It's never idle

Modern onboard electronic equipment needs a high level of electrical support. So we’ve built a high-output alternator into these engines, so you’ll never be short of power.

In touch

Engine data can be obtained by simply using the up and down buttons on the gauges.

Close up of dials.

The gauges also display engine alert indicators in the unlikely event you have a problem – like over-heating or low oil pressure.

Boat using BF80 engine, being used by model, coastal location.

Slow speeds can be regulated by the optional Trolling Control while fishing.


It hauls fast

The slim and sleek hydrodynamic design isn't just about good looks. The Honda gear case efficiently transfers all that horsepower straight into the water.

Close up of gear case.

The slim gear case has an extremely low drag coefficient, which improves performance and economy at high speed.

When you combine the innovative technology of a stronger transmission inside the motor with the low drag, you’ll find you’ve got a high-performing and economical engine to hang on the back of your boat.

Geared for speed

The hydrodynamic gear case – slim for a big motor – has a super-low drag coefficient, and the gears within are machined and honed to ultra-fine tolerances. Working together, they reduce friction at high speed. You’ll be very happy with improved fuel economy at any speed, and with a gear ratio of 2.33:1, it will push you along with ease. 

Close up of BF100 engine.
Boat using BF80 engine, being used by models, coastal location.

Speed, power and stunning looks. The BF80 has everything you want from a marine engine.