setting new expectations for portable power

Portable four strokes

Mechanical or Tiller: 25 hp, 20 hp Tiller: 15 hp

Yamaha’s high-powered portables are redefining the expectations for portable horsepower, from the F15 to the all-new F20 built on the same outstanding platform as the F25, a 2017 IBEX Innovation Award Winner. Their single-overhead-camshaft, two-cylinder designs create power to weight that’s not only eye-opening—but in the case of the F25, it’s also class-leading and category jumping. In fact, the Yamaha’s 25 hp is the lightest 25 on the water—two stroke or four stroke. Like its F15 and F20 siblings, the F25 has signature portable advantages like an oil-retention system for leak-free, on-side storage capability, carry handles and resting pads. So whether you’re headed duck hunting with a jon boat or on the way to a lake cottage and your 14-foot aluminum boat, your Yamaha portable’s ready to go.

Owners Manuals

View the 25 hp

View the 20 hp

View the 15 hp

THE OUTSTANDING, 25 HP PORTABLE

Yamaha’s F25 is still the lightest 25-horsepower outboard on the water—two stroke or four stroke. Its portable design and class-leading power-to-weight mean 25 horses can boldly go where they’ve never gone before. Jons. 14-foot aluminum fishing boats. The bed of your truck.

Power & Performance

Efficient Power

The F25, F20 and F15 all feature a two-valve-per-cylinder, single-overhead-camshaft design that provides better breathing and more power.

Optimum Performance

An optimally balanced crankshaft and labyrinth exhaust deliver smooth power, while Microcomputer Ignition adjusts timing to maintain maximum engine performance, economy and power under all conditions

Streamlined Intake

An intake silencer and manifold on the F20 and F15 result in more direct airflow, for minimum noise and maximum power.

Responsive Acceleration

An acceleration pump on the F20 and F15 gives the engine the fuel it needs--when it needs it--like during rapid throttle advance. This ensures responsive acceleration.

Reliability & Durability

Optimal Operation

CDI Microcomputer Ignition monitors throttle position, engine speed and atmospheric conditions in order to precisely adjust ignition timing under all conditions for optimum ignition performance, ensuring smooth and reliable operation.

Convenience & Control

Max Maneuverability

A 45-degree steering angle in each direction means great maneuvering potential.

Easy Engine Flushing

A Freshwater Flush Device allows you to flush the engine without running it, for added convenience and extended engine life.

Portability and Storage

Incredible light weights, built-in resting pads and carry handles, an easy oil retention system and an optional folding tiller handle, allow for easy carrying and on-side storage without oil leakage or cowling scuffs.

Product Videos:

Yamaha Portable

Portable 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

Portable 20 hp

Our 432-cc all-new 20-hp portable outboard-built on the same award winning platform as the F25 and sharing its SOHC in-line design and streamlined intake manifold, delivers solid power. Not only that, but it’s one of the most fuel efficient in its class. At just 126 pounds, it’s suitable for lightweight craft such as aluminum fishing boats, tenders and inflatables.

Available for remote mechanical or tiller-handle control
Only 126 pounds (15” shaft model)
Available in 15” and 20” shaft lengths
Powerful 16-amp alternator

Controls

Gauges

Prop Selector

Portable 15 hp

Our 362-cc 15-hp portable features a SOHC in-line, two-cylinder design. Its single carburetor and CDI Microcomputer Ignition System make it one of the most fuel-efficient in its class. At just 111 pounds, it’s suitable for lightweight craft such as aluminum fishing boats, tenders and inflatables.

Available for tiller-handle control
Only 111 pounds (15” shaft model)
Available in 15” and 20” shaft lengths
Powerful 10-amp alternator

Controls

Gauges

Prop Selector

Specs & Compare

25 hp
20 hp
15 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)
C.A.R.B. Rating	2-Star
Exhaust	Through Propeller
Intake	4
Ignition	CDI Microcomputer
Spark Plug	DPR6EB-9
Alternator Output	16 Amp
Starting System	Electric & Manual
Lubrication	Wet Sump
Engine Oil Capacity	1.1L/1.0L
Recommended Cooling	Thermostatic Control
Ethanol Blend Limit	10% Maximum
Gear Ratio	2.00:1
Gear Shift	Forward, Neutral, Reverse
Shaft Length	15" - 20"
Degree of Tilt	62° - 63°
Degree of Trim	-3° through +16°
Dry Weight	15" shaft / 57kg (126 lbs), 20" shaft / 65kg (143 lbs)
Mounting Centers	N/A
Steering Angle (maximum)	45° from center, either direction
Warranty	Limited 3-year Pleasure, 3-year Government, 1-Year Commercial

† 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).

Engine Comparison

Engine Type	2 cyl
Displacement	432 cc
Bore x Stroke	65 x 65.1mm (2.554 x 2.558 in)
Prop Shaft Horsepower	20 hp @ 5500 rpm
Full Throttle RPM Range	5000 ~ 6000 rpm
Alternator Output at W.O.T.	16 Amp
Compression Ratio	9.3:1
Fuel Induction System	EFI
Weight †	57 kg (126 lbs) - 66 kg (146 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)
C.A.R.B. Rating	2-Star
Exhaust	Through Propeller
Intake	4
Ignition	CDI
Spark Plug	DPR6EB-9
Alternator Output	16 Amp
Starting System	Electric & Manual
Lubrication	Wet Sump
Engine Oil Capacity	1.1L/1.0L
Recommended Cooling	Thermostatic Control
Ethanol Blend Limit	10% Maximum
Gear Ratio	2.00:1
Gear Shift	Forward, Neutral, Reverse
Shaft Length	15" - 20"
Degree of Tilt	62°- 63°
Degree of Trim	-3° through +16°
Dry Weight	15" shaft / 57 kg (126 lbs), 20" shaft / 65 kg (143 lbs)
Mounting Centers	N/A
Steering Angle (maximum)	45° from center, either direction
Warranty	Limited 3-Year Pleasure, 3-Year Government, 1-Year Commercial

Engine Comparison

Engine Type	2 cyl
Displacement	362 cc
Bore x Stroke	63 x 58.1mm (2.48 x 2.29 in)
Prop Shaft Horsepower	15 hp @ 5500 rpm
Full Throttle RPM Range	5000 ~ 6000 rpm
Alternator Output at W.O.T.	10 Amp
Compression Ratio	9.3:1
Fuel Induction System	Carb
Weight †	50kg (111 lbs) - 59kg (132 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)
C.A.R.B. Rating	3-Star
Exhaust	Through Propeller
Intake	4
Ignition	CDI
Spark Plug	DPR6EB-9
Alternator Output	10 Amp
Starting System	Electric & Manual
Lubrication	Wet Sump
Engine Oil Capacity	1.8L/1.6L
Recommended Cooling	Thermostatic Control
Ethanol Blend Limit	10% Maximum
Gear Ratio	2.08:1
Gear Shift	Forward, Neutral, Reverse
Shaft Length	15" - 20"
Degree of Tilt	67°- 71°
Degree of Trim	-4° through +16°
Dry Weight	15" shaft / 50kg (111 lbs), 20" shaft 60kg (132 lbs)
Mounting Centers	N/A
Steering Angle (maximum)	45° from center, either direction
Warranty	Limited 3-Year Pleasure, 3-Year Government, 1-Year Commercial

View Bulletins for all Models

Perf. Bulletins

25 hp
20 hp
15 hp

Manufacturer	PowerMatched	Boat Model	Engine	Configuration	Bulletin