PORTABLE 4 hp
 
Our 139-cc 4-hp portable outboard mirrors our OHV F6, with a couple less horses. It features the same ergonomic, easy-grip starter handle with a built-in decompression device for effortless starts. The F4 also features a built-in fuel tank with the option of switchable access to an additional external tank for amazing extended range. There’s no stopping this little brute.
 
Tiller-handle control with forward-neutral-reverse shifting and an ergonomic twist-grip throttle
Only 59 pounds (15” shaft model)
Available in 15” and 20” shaft lengths
Solid 6-amp alternator
 
Engine Type
1 cyl
Displacement
139cc
Bore x Stroke
62 x 46mm (2.44 x 1.81in)
Prop Shaft Horsepower
4hp at 4500 rpm
Full Throttle RPM Range
4000 ~ 5000
Alternator Output at W.O.T.
6 Amp
Compression Ratio
8.9:1
Fuel Induction System
Carb
Weight †
27 kg (59 lbs) - 28 kg (61 lbs)
Recommended Fuel
Octane 87
Recommended Engine Oil
Yamalube® 4M (See owner's manual)
Recommended Fuel Filtration
N/A