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 four-stroke 25 hp, previously a midrange outboard, is now so light, it’s jumped to our portable family. Like its new F15 and F20 siblings, the F25 has taken on 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
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
Variable Trolling RPM Range
HP Rating at Propshaft
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 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
Steering
Ethanol Blend Limit 10% Maximum
Gear Ratio 2.00:1
Gear Shift Forward, Neutral, Reverse
Control Method
Shaft Length 15″ – 20″
Degree of Tilt 62° – 63°
Degree of Trim -3° through +16°
C.A.R.B. Rating 2-Star
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
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