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 |