About This Outboard

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

Quick Outboard Specs

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 RPM

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

Warranty: Limited 3-year Pleasure, 3-year Government, 1-Year Commercial