| Weight † | 27 kg (60 lbs) – 28 kg (61 lbs) |
|---|---|
| Full Throttle RPM Range | 4000 ~ 5000 |
| Fuel Induction System | Carb |
| Recommended Engine Oil | Yamalube® 4M (See owner’s manual) |
| Engine Type | 1 cyl |
| Displacement | 139cc |
| Bore x Stroke | 62 x 46mm (2.44 x 1.81in) |
| Prop Shaft Horsepower | 4hp at 4500 rpm |
| Alternator Output at W.O.T. | 6 Amp |
| Compression Ratio | 8.9:1 |
| Recommended Fuel | Octane 87 |
| Recommended Fuel Filtration | N/A |
| C.A.R.B. Rating | 3-Star |
| Exhaust | Above Propeller |
| Intake | 2 |
| Ignition | CDI |
| Spark Plug | CR6HSB |
| 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″ – 20″ |
| Degree of Tilt | 69° |
| Degree of Trim | -4° through +16° |
| Mounting Centers | N/A |
| Steering | |
| Steering Angle (maximum) | 90° from center, either direction |
| Warranty | Limited 3-Year Pleasure, 3-Year Government, 1-Year Commercial |
Yamaha 139-cc 4-hp Portable Outboard Motor
$1,320.00
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. Weighing only 60 pounds for the 15-inch shaft model, it is available in 15” and 20” shaft lengths and equipped with a solid 6-amp alternator.
Key Features
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Effortless Starting: Equipped with an ergonomic, easy-grip starter handle and a built-in decompression device for smooth, simple pulls.
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Extended Range: Features a built-in fuel tank with switchable access to an additional external fuel tank.
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Lightweight Design: Weighs only 60 pounds for the 15-inch shaft model.
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Build & Power: Offered in 15” and 20” shaft lengths with a solid 6-amp alternator.
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Shipping & Delivery
Shipping & Delivery
We pride ourselves on offering fast and reliable shipping directly from our warehouse. Most in-stock outboard engines ship within 1–3 business days, ensuring you get your new engine as quickly as possible. Nationwide delivery is available across the U.S., with all engines carefully packaged to prevent damage during transit.
For local customers, we offer the convenience of pickup from our warehouse or local delivery. Our team is happy to assist with loading, and if you need installation or rigging support, we can help with that too.
If you're ordering from outside the U.S., we also offer international shipping. Contact us directly for a customized shipping quote, including rates, timelines, and any additional import details to ensure a smooth delivery to your location.
