Mercury F25 EFI 25HP – Ultra-Light 3 Cylinder Outboard for 4–5m Boats

Mercury F25 EFI is among the lightest 25HP outboards available, making it a game-changer for boaters who need power that’s easy to handle. Its modern 526cc 3-cylinder four-stroke engine and clever design bring the weight down to roughly 60 kg for the manual-start base model (one of the lowest in its class), while the electric-start versions with trim still weigh only around 65–70 kg. This low weight means improved portability and less stress on your boat’s transom. But don’t let the compact size fool you – the F25 punches above its weight. The EFI system provides instant throttle response and reliable starting with no priming or choking, even on cold mornings or at high altitudes. Mercury’s engineering ensures the F25 delivers a high torque output and smooth power curve, thanks to the three-cylinder configuration that significantly reduces vibration compared to older two-cylinder 25HP designs.

The F25 is available with a range of configurations to suit different needs. If you prefer tiller steering, Mercury’s ergonomic “Big Tiller” handle offers full features: forward-neutral-reverse shifting, twist-grip throttle, friction adjustment, and stop switch, all integrated. The tiller also rotates 180°, giving you extreme maneuverability – ideal for anglers or when navigating in tight spots. If your boat is console-operated, remote control versions of the F25 are ready to connect to steering and throttle cables. You can choose between manual start or electric start, and models with Power Tilt or a gas-assist tilt cylinder are available to make tilting the engine effortless when beaching or trailering. With the gas assist (GA) tilt, even the manual trim models can be tilted up with minimal effort.

Mercury F25 isn’t just about portability – it’s built tough for serious use. It features a pressurized lubrication system to protect the engine during long runs, and safeguards like low oil pressure and over-rev limiters. Cooling is thermostat-controlled for consistent engine temperature, which prolongs engine life. The F25 also employs Mercury’s multi-layer corrosion protection so you can use it in saltwater environments with confidence. Overall, Mercury F25 EFI strikes the ideal balance of power and lightness, making it a top choice for 4–5 meter boats that need an extra boost without the burden of a heavier engine. It’s equally at home powering a small aluminum fishing boat, an inflatable RIB, or acting as a dependable auxiliary motor on a larger vessel.

Use Cases & Recommendations:
– Perfect for 4–5m boats (13–16 ft) such as inflatable RIBs, aluminum skiffs, or open fiberglass boats where keeping weight down is important for performance and balance
– Great as a portable outboard for frequent transport – at ~60–65 kg, the F25 can be carried or mounted/dismounted by two people with relative ease, simplifying use on dinghies and small craft
– Ideal for fishing and hunting boats that navigate shallow waters – the shallow-water tilt settings and light weight allow access to skinny waters, and the quiet operation won’t disturb wildlife
– Suitable as a kicker/trolling motor on larger boats (sailboats or cruisers) – it offers reliable auxiliary power with EFI dependability and charges the battery via its 15A alternator
– Recommended for users who require easy handling and reliability – from camps, rescue services to sailing clubs, the F25’s easy start, simple controls, and robust build make it a dependable workhorse in various scenarios