/ 
With the redesign of its 4-cylinder (BF115, BF135, BF150) and V6 (BF200, BF225, BF250) blocks, Honda Marine is redefining a large part of its top-of-the-range offering. Presented at European boat shows in September 2025, these engines will be available in early 2026. Here are the major evolutions to remember, between durability, ergonomics and revised performance.
Reinforced mechanics: durability at the heart of developments
Honda engines are often praised for their reliability. This new range further enhances this advantage by adapting components to the demands of intensive use. Notable modifications include a new shape for the oil pump and cylinder head gaskets to improve water evacuation and limit corrosion. Under-hood fasteners and seals have been redesigned to withstand aggressive marine environments. Longevity is also enhanced by longer valve adjustment intervals and the introduction of iridium spark plugs. A way to reduce workshop visits and increase time at sea.
Electronic controls for smoother, simpler operation
The models drive-by-wire now include iST (Intelligent Shift and Throttle) as standard, compatible with multi-station or multi-motor systems. This cable-free electronic system improves manoeuvring precision, with a compact housing, more flexible levers and a new five-button multifunction side control.
The latest-generation 7-inch HD display completes the device, with more legible information than the previous HD-4 and HD-5 models. The system is designed to operate without reprogramming on single-engine installations, making it easy to implement.
Power management: low-end torque and optimized efficiency
Today's engine manufacturers are looking for a balance between torque, flexibility and fuel consumption. Honda relies on its proven proprietary systems:
- BLAST (Boosted Low Speed Torque) modulation of ignition timing to improve starting and acceleration.
- VTEC (Variable Valve Timing and Lift Electronic Control) variable valve timing for a progressive power curve.
- ECOmo optimized fuel enrichment according to engine load, for lower fuel consumption at steady speeds.
- PGM-FI (Programmed Fuel Injection) electronic injection management for more reliable cold starts and immediate response to acceleration.
These technologies make the new engines equally well suited to cruising boats, high-performance RIBs and workboats.
Installation and maintenance: easier access and simplified assembly
For boatbuilders and yachtsmen wishing to repower a boat, these developments facilitate installation. The repositioning of the bolts means faster installation, without the need for major modifications to the transom. For routine maintenance, the new positioning of the oil filter limits dripping, and the vapor separator is easier to remove. These details, although discreet, have a direct impact on the cost and ease of long-term maintenance.
Harmonized design: towards a unified visual identity
The design of the new 4-cylinder and V6 engines follows in the footsteps of the BF350 V8 recently presented. Streamlined fairings, high-rigidity parts and improved finishes enhance the quality aspect of the engines. Boaters can choose from three colors: aquamarine Silver , blanc Grand Prix White and the new Sporty White available on the most powerful models.
