Lightweight & Feature Packed

The exciting new F25 delivers the weight and performance you would expect from a two-stroke, with all of the advantages that comes with Yamaha’s industry-leading four-stroke technologies.

This new generation outboard is not only an improvement on the four-stroke model it replaces, but also exceeds the all-round capabilities of Yamaha’s legendary 25N two-stroke outboard.

For the first-time in Yamaha’s four-stroke history, the new F25 comes with battery-less fuel injection – delivering easier starts, better fuel economy, and an improved overall operating performance.

Through smart design, the new compact F25 is now the lightest 25 horsepower outboard in its class – 20Kg lighter than its four-stroke predecessor and less than 10 kg heavier than Yamaha’s 25N two-stroke.

This engine comes packed with additional features including Yamaha’s variable trolling switch which allows anglers to precisely set the engine speed for optimum lure presentation.

The F25C is not only compatible with Yamaha’s range of command link gauges, but can also be connected to third-party multi-function displays, GPS and fish finders.

Another great feature is the ability to fit Yamaha’s exclusive YCOP engine immobilizer, delivering peace of mind by preventing unauthorized engine start-ups

The new F25 can be configured with manual or electric start, tiller handle or mechanical steering, and manual or power, trim and tilt options.


Four-Valve, Single Overhead Cam

The four-valve, two-cylinder, Single Overhead Camshaft delivers sufficient torque from low to mid speed ranges for a quick response and smooth running.

Battery-Less Multi-Point Electronic Fuel Injection

The Multi-Point Fuel Injection (EFI) system, in conjunction with the Engine Control Module (ECM), injects the right amount of fuel into the combustion chamber at the optimum timing.

This system takes into account engine speed and load requirements to achieve maximum engine performance including ‘first-time, every-time’ hot and cold starting, improved fuel efficiency, excellent throttle response, clean and efficient combustion and lower exhaust emissions.

The F25 is the first battery-less fuel injection system in Yamaha’s four-stroke range, making engine set-up more simple and convenient for pull-start models. Electric start models require a battery.

Variable Trolling Control

Yamaha’s variable trolling control allows you to precisely adjust the engine’s idling speed from 750 to 1050 RPM, in 50 RPM increments. The ability to finely tune the trolling speed allows fisherman to perfect their lure presentation when chasing different species of fish.

Ergonomic Carry and Control Handles

Large comfortable grips located on the front and back of the engine make carrying, mounting and removing the engine easier. The tiller handle (optional) folds neatly back to make the engine even more compact for carrying and storage.

Resting Pads

The special rest-pads allow the engine to be laid down on its back vertically or alternatively on its side.

Wide Span Mounting System

The large rubber mounts and the wide length between the mounts help to reduce engine vibration.

Power Trim and Tilt (F25LC only)

Yamaha’s push-button trim control makes engine trim and tilt adjustments quick, smooth and easy, across a wide range.

The negative trim settings allow for improved acceleration and the ability to bring the boat onto its plane more quickly.


Wide Angle Steering (Tiller Models Only)

The large steering angle makes steering highly responsive for tight manoeuvring around docks and other vessels.

Digital Network Gauges Compatible

These engines are compatible with Yamaha’s Digital Network Gauges (Command Link), giving you the information needed to maximise engine performance and efficiency, including a Multi-function Tachometer with RPM, Hours Run, Trim Angle, Oil Pressure, Warning lamps and Variable RPM control – and a Speed/Fuel Management Gauge with Speed, Tank Capacity and Fuel Economy.

This engine is also NMEA2000 compatible allowing the F25 to share information with third party multi-function displays, GPS and fish finders.

Multi-Function Tiller Handle (Optional F25LC Model Only)

Incorporating the latest technologies, ergonomic design and practical features, Yamahas Multi-Function Tiller Handle delivers effortless control, maneuverability and comfort.

Trim, shift and throttle controls are conveniently integrated into the handle. Engine stop switch, ‘Start-In-Gear’ protection and integrated overheating and low oil pressure warning alerts are also built in.

The tiller arm angle is fully adjustable and can be easily positioned out-of-the way when not in use. Tiller steering and throttle resistance can also be customised to suit user preference.

ECU Micro-Computer Control

This Yamaha engine is controlled by an advanced microprocessor Engine Control Unit (ECU), which receives inputs from six major sensors located throughout the engine. This information is used to ensure the engine runs at peak performance, by delivering the right fuel/air mixture to each combustion chamber.

The ECU also detects any oil pressure, overheating or other operating issues.

Remote Control Security System (Optional)

Yamahas Customer Outboard Protection (Y-COP) engine immobiliser system is easy to use and highly effective in stopping unauthorised start-ups when your boat is unattended.

Simply push the button on the neat and simple remote to lock and unlock the engine. Available for both mechanical steering and tiller options.

Prime Start™ (Optional)

Exclusive to Yamaha, Prime Start™ makes starting a Yamaha outboard as easy as starting a car. It allows the engine to be started cold by automatically controlling the engine ‘warming up’ process – eliminating the need for a conventional choke.

With Prime Start™ you no longer need to ‘warm up’ your engine by revving it in neutral.

Fresh Water Flushing System

Simply connect a hose to the easy access connector to flush salt and dirt from the outboard without having to run the engine. Flushing the engine after each usage reduces corrosion and extends the engines life.

High-Output Alternator

A 16 Amp high-output alternator ensures that power is always available to start the engine, even after long periods of idling or running at low revs. This not only provides extra starting power, but delivers sufficient power to run the wide array of on-board electronic devices used in modern boating.

Easy Start Decompression Device (pull start)

For easy pull starting, these engines feature an auto decompression device fitted to the camshaft. This system releases pressure in the cylinder when the manual pull start is engaged allowing for light and convenient pull starting.

Mechanical Steering Control

The F25SWC and F25LC models offer a mechanical steering control system.

One-Piece Cowling Protection from the Elements

This engine features a one-piece outer cowling design with an intake air drain system, to easily and efficiently drain away any water that enters the cowling during normal engine operation. Incoming air is routed through a labyrinth of passages that help trap and drain water before it enters the engine’s intake, for maximum reliability.


Manuel Tilt Shallow Water Drive (Manual Tilt Models)

The F24SMHC, F25LMHC and F25SWC models feature a two-step shallow water drive system, which is extremely useful for tackling Australia’s shallow rivers, estuaries, creeks and when coming to shore. These engines also come with a four-step manual trim adjustment that can be modified depending on water conditions and boat load, for optimum engine performance.

A power, trim and tilt option comes with the F25LC model.

Start-In-Gear Protection

Yamaha’s Start-in-gear Protection stops the engine from being accidentally started in-gear. If the engine is not in neutral, the starter will either be locked for pull-start models or the power supply isolated for electric start models.

Over Rev Limiter

Acts automatically to stop over-revving which can be caused by cavitation and other means – helping to prevent damage to the engine.

Advance Warning Systems

Yamaha’s engines are renowned for their reliability, however, should a fault occur, you can feel safe in the knowledge that back-up systems are in place.

Yamaha’s advanced warning system provides clear audio/visual warning alerts for oil pressure, engine temperature and other key variable problems.

If a fault occurs, the engine RPMs will automatically reduce to help protect the engine and to allow the vessel to slowly make its way back to shore.

Vapour Reduction Fuel Return System

A precise amount of fuel that is required by the engine will be delivered to the fuel injectors. It effectively reduces fuel vapour, by making sure no extra fuel is sent through the fuel rail, which is located near the highly heated cylinder head. Any fuel not required by the engine is kept away from the heat.


Labyrinth Exhaust System

Yamaha’s proven labyrinth exhaust system reduces engine noise at low RPM and idle. A water sealed outer wall around the exhaust muffler effectively reduces exhaust tone for whisper quiet operation and enhances cooling which protects the exhaust system against corrosion.


Large Water Separator with Water Sensor

This easily accessible water filter separates water and contaminants from the fuel before they reach the fuel injectors for reliability and durability.


Long Intake Manifold

The long intake manifold increases torque at low speeds for better acceleration.


Anti-Corrosion – 5 Stage Paint System

Yamaha engines are known for their durability and high re-sale value. Part of this lies in the anti-corrosion protection.
Yamaha’s exclusive YDC-30 aluminium alloy protects the engine’s exterior parts, while a zinc coating, high-quality stainless steel, and 5-stage exterior paint coating offers long-lasting protection – inside and out.



Engine Type 4-Stroke, SOHC In-line 2
Displacement 432 cc
Bore x Stroke 65 x 65.1 mm
Recommended Max RPM 5000-6000
Lubrication System Wet sump
Fuel Management EFI
Ignition CDI
Starter System Manual (SMHC, LMHC, SWC), Electric (SWC, LC)
Lighting Coil 120W (MH)
Alternator Output 12V – 16A
Operation Method Tiller handle (SMHC, LMHC), Remote control (SWC, LC*)
*Multifunction Tiller Handle Optional
Trim & Tilt Method Manual tilt (SMHC, LMHC, SWC), Power trim & tilt (LC)
Digital Gauges Opitonal
Digital Network Gauges with Fuel Management Optional
Gear Ratio 2.08 : 1
OEDA Emission Rating


  • F25SMHC : 424 mm (16.7 in)
  • F25LMHC : 551 mm (21.7 in)
  • F25SWC : 424 mm (16.7 in)
  • F25LC : 551 mm (21.7 in)
  • F25SMHC : 57 kg
  • F25LMHC : 59 kg
  • F25SWC : 57 kg
  • F25LC : 64 kg