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F4

Lightweight, compact and economical, Yamaha’s single-cylinder portable F4 has been designed to be ultra-easy to use and transport. Featuring a specially developed four stroke, Overhead Valve (OHV) design, this engine delivers excellent fuel efficiency and smooth running. Attention to detail makes this Yamaha small engine great by delivering a user experience that stands head and shoulders above anything else.

Description

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

Engine Type1 cyl
Displacement139cc
Bore x Stroke62 x 46mm (2.44 x 1.81in)
Prop Shaft Horsepower4hp at 4500 rpm
Full Throttle RPM Range4000 ~ 5000
Alternator Output at W.O.T.6 Amp
Compression Ratio8.9:1
Fuel Induction SystemCarb
Weight*27 kg (59 lbs) – 28 kg (61 lbs)
Recommended FuelOctane 87
Recommended Engine OilYamalube® 4M (See owner’s manual)
Recommended Fuel FiltrationN/A

Dimensions

Transom Height (mm [inch])S: 435 [17.1] | L: 562 [22.1]

Dry Weight (kg)S: 27 | L: 28

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