Just Generators

The UK's Number 1for Generators and Power Equipment
01263 820202
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Delivery is free of charge to most of the UK mainland* for orders over £50.00**.

* Scottish Highlands, Offshore UK & Republic of Ireland

If you're ordering to the Scottish Highlands, an offshore UK address or to the Republic of Ireland additional charges may apply. To receive a quote for these costs along with estimated delivery times, please contact us stating your address and the items you would like to order. You can still place your order through the website without receiving a quote but we will be in touch after the order has been placed to confirm delivery costs.

*The following Scottish and offshore postcodes may incur an additional delivery charge:

  • AB
  • BT
  • DD
  • DG
  • EH
  • FK
  • G
  • GY
  • HS
  • IM
  • IV
  • JE
  • KA
  • KW
  • KY
  • ML
  • PA
  • PH
  • PO
  • TD
  • ZE

**Orders under £50.00 will incur a shipping charge of £5.95. Our full delivery policy is here.

If your order is subject to any additional shipping charges, we will contact you (via email or telephone) prior to processing your payment.

For more information call our sales team on 01263 820202


Honda GX120 SX4 Engine

Honda GX120 SX4 Engine

To find out more about this product, please call our experts on 01263 820202 or fill out our contact form here

Availability: In stock

ex. VAT: £249.17 £299.00 RRP £515.35 | SAVE £216
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  • 4.0 Horse power
  • 18mm Crank Shaft
  • Recoil Start
  • Oil Alert
  • 4-stroke petrol unleaded
  • Cast iron sleeve

Honda GX120 SX4 Engine Details

SX4 - 18mm Crank Shaft Recoil Start Oil Alert

Why choose this engine?

The Honda GX120 engine is ideal for a wide range of heavy duty applications, such as generators, welders, construction equipment, tillers, water pumps, and many other industrial applications. 

With its OHV design, it enhances combustion efficiency and has a high power-to-displacement ratio. 

The GX120 has easy starting with an automatic decompression system and an easy to grip soft recoil starter handle.

Being a 4-stroke engine, it means that it meets the worlds most stringent environmental legislation and emits very few emissions, has low fuel and oil consumption and reduced vibration and noise levels.

With its compact design and perfectly matching auxiliary components enable the engines to be mounted in an extensive range of equipment.

Honda engines are designed for versatility and simple installation, including several output shaft variations, reduction gearboxes, optional equipment and mounting flanges which match industry standards.

Engine features:

  • OHV design enhances combustion efficiency
  • High power-to-displacement ratio
  • Easy starting with an automatic decompression system and an easy-to-grip soft recoil starter handle
  • High quality materials and purpose-built components which ensure reliable, long-term use
  • Meets world's most stringent environmental legislation
  • Low fuel and oil consumption
  • Reduced vibration and noise levels 


Honda customers deserve complete peace of mind when purchasing the GX120, which is why it comes with a 12 months warranty.


Brand Honda
Power Source Petrol
Power Details Air cooled 4-stroke OHV petrol engine, 25° inclined cylinder, horizontal shaft,
Cylinder Sleeve Type Cast iron cylinder sleeve type
Bore x Stroke 60 x 42 mm
Compression 8.5 : 1
Max Power Output 2.9 Kw (4 HP) / 3600 rpm
Max Torque 7.4 Nm / 0.75 Kgm / 2500 rpm
Ignition System Transistorised
Starting Method Recoil
Fuel tank Capacity 2.5 litres
Specific Fuel Cons. 313 g/kW.hr - 230 g/HP.hr
Engine Oil Capacity 0.6 litres
Dimensions (L x W x H) 305 x 341 x 318 mm
Weight 13 kg
Warranty 12 months
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