Telephone (Plymouth): +44(0)1752 491900 - (Harleyford): +44(0)1628 471368
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Products: Yamaha Outboard Motors - Four Stoke Portables - F4B, 4hp
YAMAHA four stroke portable outboard motors
F4B, 4hp - four stroke, outboard motor - from £1019 (inc Vat)

A powerful four stroke portable outboard.
Discover an engine so light you can carry it to the waterside or onto the deck of your main craft. The F4 is easy to store, easy to use, easy to start, and offers the power and reliability to let you hit the water with confidence.
The compact size and large handle makes it highly portable, and start up is easy with Yamaha's CDI Ignition system. On the water you will be deleighted by the low fuel consumption, simle controls, limited noise and vibration, and complete reliability.
Whether you're a fishing enthusiast looking for an easy way to get on the water, or a yacht owner seeking a handy auxiliery - The Yamaha F4 offers the ideal solution.

The class leading Yamaha 4hp four stroke outboard engine features:

  • Fresh two tone body colour with white top cowling
  • Unique 3 position oil leak free storage system
  • Convinient auxiliery primepump in cowling for easy starting after prolonged storage
  • Large carry handles for convinience and comfort
  • CDI Ignition for easy starts in all conditions
  • Easy to use steering and large shift lever

Interested in buying a Yamaha outboard engine?
Call us: 01628 471368

Click on this link to view all Yamaha Outboards pricing information (pdf format.)

The smoothest and quietest 4hp four stroke on the market. With its twin cylinder design, the Yamaha F4B easily outperforms all the single cylinder 4hp engines in this class, whilst offering far superior refinement. Also available in 5hp and 6hp versions for those who require that little bit extra speed, all these models are renown for the superb fuel economy and reliability.

Outboard Engine Specifications F2.5A F4B F6A
R.R.P from from £649 from £989 from £1,089
Engine type 4-Stroke 4-Stroke 4-Stroke
Number of Cylinders / Configuration 1 1 2/in-line
Bore x Stroke (mm) 54 x 31.5 59 x 41 56 x 40
Displacement (cm3) 72 112 197
Full throttle range (rpm) 5250-5750 4000-5000 4500-5500
Prop shaft output at mid range (kW/rpm) 1.8/5500 2.9/4500 4.4/5000
Weight with propeller (kg)
Weight without propeller (kg)*
F2.5AMHS: 17.0
F2.5AMHL: 17.5
F4AMHS: 22.0
F4AMHL: 23.0
F6AMHS: 37.0
F6AMHL: 38.5
Recommended boat transom height (mm) S: 381
L: 508
S: 381
L: 508
S: 381
L: 508
Carburettors 1 1 1
Electronic fuel injection - - -
Fuel tank capacity 0.9 1.1 Seprate, 12
Oil pan capacity (litres) 0.4 0.5 0.8
Lubrication Splash Splash Wet-sump
Ignition / Advance system TCI TCI CDI/Computer
Lighting coil / alternator - - 12V - 6A
Gear ratio 13:27 13:27 13:27
Starter system Manual Manual Manual
Steering Tiller handle Tiller handle Tiller handle
Throttle and shift controls Twist grip
F-N/slide shift
Twist grip
F-N-R/slide shift
Twist grip
F-N-R/slide shift
Trim & tilt method
(Trim angle)
Number of Propeller options
Size range (ins)
5 - 8¼
6½ - 8
5 - 8½
* The kW data is based on the ICOMIA 28 standard, measured at the prop shaft

Click the links below to view other available Yamaha outboard engine information:

Click here to go back and view all Yamaha products from Espar Ltd.


Espar Limited, Harleyford Marina, Harleyford, Marlow, Buckinghamshire SL7 2DX. Registered in England No. 4162059.
Registered Office – as above, VAT Registration No 77 3590 82
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