Meet the Water's Lightest 25 hp

The Redesigned F25

Completely reinvented and a 2017 IBEX Award Winner, the all-new Yamaha F25 is the lightest 25-horsepower outboard on the water—two stroke or four stroke. In fact, it’s SOHC 2-cylinder design creates a power-to-weight that’s not only class-leading; it’s category-jumping, taking on Portable performance advantages. Once that sinks in, you’ll realize it means 25 horses can boldly go where they’ve never gone before. Jons. 14-foot aluminum fishing boats. The bed of your truck. While its streamlined design is up to 25 percent lighter, it still manages to pack in exciting new features—like Power Trim and Tilt, battery-less EFI and an optional electric start kit. The completely reimagined Yamaha F25 Portable four stroke. It’s one of the most exciting outboards to hit the water in years.

View the 25 hp

CLASS-LEADING POWER-TO-WEIGHT

The all-new F25 Portable four stroke features a Single Overhead Camshaft, 2-cylinder powerhead, for a compact design that weighs in at only 126 pounds. That gives it the best power-to-weight ratio of any 25-horsepower outboard on the water—two stroke or four stroke.

Power & Performance

Incredible Power to Weight

The F25 design features two-valves-per-cylinder and a single overhead camshaft, making it the lightest 25-horsepower outboard on the water. This also means better breathing and more power.

Battery-less EFI

The F25's electronic fuel injection system provides smooth running and greater fuel efficiency than the previous F25. And the system operates without a battery, thus reducing weight so if you want to go light, you can. The New F25’s battery-less system was designed to require minimal effort for manual starting through an auto decompression device and a short pull. (A battery is required for electric-start capability.)

Compact and Light

Compare the more compact profile of the F25C vs. the F25B. At 126 pounds, it is 25 percent lighter than the F25B. This weight reduction, along with new carry handles means portability in the 25-horsepower class.

Faster Than Previous Designs

The F25C also out-accelerates its predecessor, the F25B. In fact, it’s not only quicker, it’s faster. The F25C bests the F25B in every measure.*

*Testing conducted by Yamaha at Yamaha’s US Test Facility on a G3 Model 1448 under heavy load conditions.

Overall Performance

The F25’s SOHC, 2-cylinder design, optimally balanced crankshaft and labyrinth exhaust deliver smooth power, and its Microcomputer Ignition adjusts timing to maintain optimal engine performance, economy and power under all conditions.

Reliability & Durability

Reliability & Durability

RELIABLE STARTS

Whether you have a manual or an electric, you can count on reliable starts. The new F25 features a no-battery-required Electronic Fuel Injection for easy starts and even lighter weight. In addition, all but one electric-start model features a through-cowling pull start, and there’s now an electric start kit for retrofitting manual models. To make starting even easier, there is an easy start decompression device.

Convenience & Control

Easy Oil Changes

The F25 features an external oil draining system, making for easy maintenance, by the boater or the dealer.
Portability

The 25 hp is up to 25 percent lighter than its previous design, but that isn’t the only thing that makes it portable. It now features built-in carry handles, resting pads, a folding tiller handle and an easy oil retention system. This allows for easy carrying and storage on its side, without oil leakage.
Variable Trolling

The F25 has a shortened tiller handle for convenient control of small jon boats. It features our Variable Trolling RPM Switch(VTS®), that allows for precision adjustment of trolling speeds from 750 to 1050 RPM in 50-RPM increments. It even offers sub-idle trolling up to 150 RPM below normal idle speed.
High-Output Alternator

The F25 features an alternator that produces up to 16 amps of power. That’s more than enough electrical power for battery charging, with plenty left to spare.
Pull Start

Through cowling pull start is standard on most electric start models.
Multi-Function Tiller Handle

All control features are located on the tiller handle for convenience, including the throttle, throttle friction control, shift lever, key switch, stop switch, power trim and tilt switch (PT&T models only) and Variable Trolling RPM Switch (VTS®).
45-Degree Steering

A 45-degree steering angle in each direction means great maneuvering potential.
Power Trim and Tilt

Select models—including 15-inch shafts—now feature a shorter, factory-installed tiller with Power Trim & Tilt and a tilt-up feature for ease in small spaces. Its compact PT&T unit keeps the weight down and provides -4° through +16° of trim for a fast hole shot, improved top speed and a smooth ride.
Ultra-Low Emissions

The new, F25 four-stroke—like all Yamaha Portables—is California Air Resources Board (C.A.R.B.) Three-Star Rated for Ultra-Low Emissions. This also meets federal EPA requirements.
Propeller Protection

Yamaha’s Shallow Water Drive helps keep the propeller and lower unit out of harm’s way in shallow water.
Extended Engine Life

A Freshwater Flush Device allows you to flush the engine without starting it, for maximum convenience, durability and engine life.
Wide-Span Mounting

The F25 features a wide-span mounting system, providing strength and minimizing vibration for a smooth run.
Y-COP®

The F25 is now Y-COP® compatible. This optional security feature disables the ignition system via an operator-controlled key FOB.
Wet Sump

The F25 uses a pressurized oil delivery system and incorporates a compact and durable oil pump to keep all of the moving parts of the SOHC system lubricated and running smoothly for maximum reliability.

Meet the Line-Up

25 hp

F25 25 hp

Our 432-cc 25-hp portable outboard features a streamlined, portable design and class-leading power-to-weight. While its 25 percent lighter than its previous design, it still packs exciting features like battery-less EFI. Pull-start models can now take advantage of this feature, plus the system is designed with an automatic decompression device to require even less effort for manual starting.

Available for remote mechanical or tiller-handle control
Only 126 pounds (15” shaft model)
Available in 15” and 20” shaft lengths and in a High-Thrust design (T25)
Powerful 16-amp alternator
Variable Trolling RPM Switch (VTS^®) is standard on factory-equipped tiller handles, and available with our Multi-Function Tiller Handle, a Command Link^® tachometer or dash mounted VTS switch
Select models - including 15-inch shafts - now feature a shorter, factory-installed tiller with Power Trim & Tilt and a tilt-up feature for ease in small spaces

Controls

Gauges

Prop Selector

Specs & Compare

25 hp

Engine Comparison

Engine Type	2 cyl
Displacement	432cc
Bore x Stroke	65 x 65.1mm / (2.56 x 2.56 in)
Prop Shaft Horsepower	25 hp at 5500 rpm
Full Throttle RPM Range	5000 - 6000
Alternator Output at W.O.T.	16 amp
Compression Ratio	9.3:1
Fuel Induction System	EFI
Weight †	57kg (126 lbs) - 65kg (143 lbs)
Recommended Fuel	Octane 87
Recommended Engine Oil	Yamalube® 4M (See owner's manual)
Recommended Fuel Filtration	Yamaha 10-Micron Fuel/Water Separating Filter (external)
Exhaust
Intake
Ignition
Spark Plug
Starting System
Lubrication
Engine Oil Capacity
Recommended Cooling
Ethanol Blend Limit
Gear Ratio
Gear Shift
Shaft Length
Degree of Tilt
Degree of Trim
Mounting Centers
Steering Angle (maximum)
Warranty

† Weight refers to shortest shaft length, and is measured without motor oil, gearcase oil and propeller (except models 25 hp and under, which include a standard propeller). All Jet model weights include the jet pump assembly (weight estimated).

Perf. Bulletins

25 hp

View Bulletins for all Models