Yamaha Four Stroke 4HP Outboard Engine

Yamaha Four Stroke 4HP Outboard Engine

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.

Yamaha F4 Outboard Motor
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139cc Single-Cylinder

The twin valve, single-cylinder, compact four-stroke engine produces clean exhaust gas with high combustion efficiency.

180° Steering

left and right turning circle, this engine makes turning and manoeuvring around docks and other vessels, simple and easy.

Three-Way Storage Positions

With the special leak-free oil storage system and tuck away tiller handle, you can safely lie the engine on its front, right or left-hand side, for convenient transportation and storage.

Built-in See Through Fuel Tank

The handy 1.1 Litre built-in fuel tank is extremely convenient for transport and allows uncluttered deck space in small boats. The semi-transparent tank makes it easy to fill and easy to check remaining fuel supply. A built in, internal primer pump allows for easy pull starting.

Oil Leak Prevention System

Yamaha's oil leak prevention system allows the engine to be stored safely on its front, left or right-hand side. This means you no longer have to worry about oil leakage while transporting this engine or holding it in storage.

Easy Start Decompression Device

This engine features an auto decompression device fitted to the camshaft for easier pull starting. This system releases pressure in the cylinder when the manual pull start is engaged, allowing for light and convenient pull starting.

Ergonomic Carry and Control Handles

Large comfortable grips located on the front and back of the engine makes carrying, mounting and removing this engine easier. The tiller handle folds neatly back to make the engine even more compact for carrying and storage.

External Fuel Tank Tap

For increased range and convenience this engine includes a switch-over facility which allows for the quick connection of an additional external fuel tank, should it be required.

Anti Corrosion Paint System

Yamaha engines are known for their durability and high re-sale value. Part of this lies in the anti-corrosion protection systems. A unique YDC-30 aluminium alloy and 5-stage exterior paint protects the engine's exterior parts, while high-quality, marine-grade, stainless steel componentry is used throughout.

Two-Way Throttle Control

Throttle is controlled by a two-way cable rather than relying on a traditional throttle return spring. This ensures long term durability, added safety and an enhanced feeling of immediate control.

Engine Type

4-Stroke, OHV, 1-cylinder

Bore x Stroke (mm)


Displacement (cc)


Fuel Management




OEDA Emission Rating


Lubrication System


Alternator Output

12V – 6A with Rectifier Regulator (Optional)

Gear Ratio

2.08 : 1

Starter System

Manual Choke

Operation Method

Tiller handle

Trim & Tilt Method

Manual tilt

Fuel Tank Capacity (l)


Digital Guages



S: 435 [17.1] | L: 562 [22.1]


S: 27 | L: 28

Yamaha F4


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