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4 hp yamaha outboard

2020 Yamaha 4 HP F4SMHA Outboard Motor

Yamaha’s smallest Portables, the F6, F4 and F2.5, weigh in at as little as 37 pounds, with streamlined overhead-valve, one-cylinder designs. Their light weights, combined with built-in carrying handles, resting pads and an oil-leak prevention system for on-side storage capability create true portability. Add to that their efficiency, performance and reliability and these pint-sized powerhouses are perfect for all sorts of light duty, like hopping to the cuddy on a tender. Wherever the day takes you, you can take along a little extra power with an F6, F4 or F2.5 Yamaha Portable.


Power/Performance of  4 hp yamaha outboard

  • Overhead Valve Design
  • Built-in Auxiliary Priming Pump
  • Streamlined Intake Manifold
  • Long Span Mount System
  • Oil Separator
  • Dynamically Balanced Crankshaft
  • Labyrinth Exhaust

Reliability / Durability

  • Pressurized Lubrication
  • SST Drive, Prop, Shift Shafts
  • Phaze Five Paint System
  • CDI Ignition System
  • Built-in Fuel Filter

Convenience / Control

  • 180 Degree Steering with F-N-R Shifting
  • Easy Storage Oil Retention System
  • Standard Tiller Handle
  • Easy Start Decompression Device
  • Lubrication Check Window
  • Multiple Gripping Points
  • Dual Transom Clamps
  • Integrated Fuel Tank – 1.1L
  • Tilted Fuel Fill Opening
  • External 3.1 Gallon Fuel Tank Optional
  • Propeller 3 Blade Standard
  • 15 inch Shaft Length
  • Weighs Only 59 Lbs


    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.

    Power & Performance
    • Lightweight, Portable Power: They may weigh as little as 37 pounds, but these Overhead-Valve portable outboards are packed with features that create smooth, quiet power. This includes a CDI or TCI ignition system, an optimally balanced crankshaft, a long span mounting system and a labyrinth exhaust.
    • Ultra-Low Emissions: The Portable F6, F4 and F2.5 are California Air Resources Board (C.A.R.B.) Three-Star Rated for Ultra-Low Emissions and meet federal EPA requirements.
    • Record Setting Fuel Efficiency: Small motors use less fuel, but according to the Guinness Book of World Records, the Yamaha F4 actually set a world record for fuel efficiency, traveling 67.27 continuous statute miles on one gallon of gas.
    Reliability & Durability
    • Easy Operation: The F6, F4 and F2.5 feature built-in, see through fuel tanks. The F6 and F4 also feature switchable access to an optional, 3.1-gallon external fuel tank for extended range.
    • Wet Sump: A pressurized oil delivery system that incorporates a compact and durable oil pump to keep all of the moving parts of their Overhead Valve systems lubricated and running smoothly for maximum reliability.
    • Corrosion Protection: Combined with our proprietary alloy (YDC-30), our exclusive Phaze Five™ electro-deposited, anti-corrosive paint system provides a tough, five-layer barrier against corrosion. This protection is standard on all Yamaha Portable outboards.
    • Maximum Efficiency: The F6, F4 and F2.5 have a carburetor with a factory-selected setting for maximum efficiency, which helps them achieve a C.A.R.B. Three-Star Rating for Ultra-Low Emissions. Additionally, automatic decompression, built-in auxiliary priming and start-in-gear prevention help make for easier starts.
    Convenience & Control
    • Easy Storage: Yamaha’s F2.5, F4, and F6 feature our Easy Storage Oil Retention System. This pressurized oiling system prevents leaks, enabling on-side storage.
    • Comfortable Control: Incredibly nimble, the F6 and F4 feature 180-degree steering and the F2.5 features 360-degree steering with a dynamically balanced and dampened twist-grip throttle for comfort and convenient maneuverabilty.
    • Portability and Storage: Built-in front and rear handles make these lightweights easy to carry. Resting pads and an easy oil retention system allow for convenient on-side storage without cowling scuffs or oil leakage.
    Model Specific Features
    • 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)
    • Recommended Fuel: Octane 87
    • Recommended Engine Oil: Yamalube® 4M (See owner’s manual)
    • Recommended Fuel Filtration: N/A
    • C.A.R.B. Rating: 3-Star
    • Exhaust: Above Propeller
    • Intake: 2
    • Ignition: CDI
    • Spark Plug: CR6HSB
    • Alternator Output: 6 Amp
    • Starting System: Manual
    • Lubrication: Wet Sump
    • Engine Oil Capacity: 0.6L
    • Recommended Cooling: Thermostatic Control
    • Ethanol Blend Limit: 10% Maximum
    • Gear Ratio: 2.08:1
    • Gear Shift: Forward, Neutral, Reverse
    • Shaft Length: 15″
    • Degree of Tilt: 69°
    • Degree of Trim: -4° through +16°
    • Dry Weight: 27 kg (59 lbs)
    • Mounting Centers: N/A
    • Steering Angle (maximum): 90° from center, either direction
    • Warranty: Limited 3-Year Pleasure, 3-Year Government, 1-Year Commercial


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