139cc Single 2.5 HP

139cc Single 2.5 HP


Our 72-cc 2.5-hp portable outboard is the smallest motor on our roster, yet, it has some of the biggest news. Completely redesigned, it’s even more portable, easier to store and cleaner burning. It recently achieved a Two-Star rating from the California Air Resources Board (C.A.R.B) for Ultra-Low Emissions and now meets emissions requirements in all 50 states.


  • Available for tiller-handle control with forward-neutral shifting, 360-degree steering and an ergonomic twist-grip throttle
  • Only 37 pounds (15” shaft model)
  • Available in 15” and 20” shaft lengths
Engine Type1 cyl
Bore x Stroke54 x 31.5 mm (2.13 x 1.24 in)
Prop Shaft Horsepower2.5hp at 5500 rpm
Full Throttle RPM Range5250 ~ 5750
Alternator Output at W.O.T.N/A
Compression Ratio8.8:1
Fuel Induction SystemCarb
Weight †17 kg (37 lbs) - 20 kg (40lbs)
Recommended FuelOctane 87
Recommended Engine OilYamalube® 4M (See owner's manual)
Recommended Fuel FiltrationN/A
C.A.R.B. Rating2-Star
ExhaustAbove Propeller
Spark PlugCR6HSB
Alternator OutputN/A
Starting SystemManual
Engine Oil Capacity0.35L
Recommended CoolingThermostatic Control
Ethanol Blend Limit10% Maximum
Gear Ratio2.01:1
Gear ShiftForward, Neutral
Shaft Length15" - 20"
Degree of Tilt79°
Degree of Trim-4° through +16°
Dry Weight15" shaft / 17 kg (37 lbs), 20" shaft / 20 kg (40 lbs)
Mounting CentersN/A
Steering Angle (maximum)360° from center, either direction
WarrantyLimited 3-Year Pleasure, 3-Year Government, 1-Year Commercial

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