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Mountfield S421R-HP Hand-Propelled Petrol Rear-Roller Lawnmower

Original price was: £399.00.Current price is: £349.00.

  • A compact and highly manoeuvrable push-type mower with a roller for that iconic striped finish
  • Clean running and fuel efficient overhead-valve engine from Stiga
  • Large-capacity fuel tank delivers long runtimes between stops
  • Simple single-lever height of cut adjustment
  • Five cutting-heights, adjustable from 20 to 70mm via just one lever
  • Space saving collapsible handlebars
  • Roomy 55-litre catcher included
  • ‘Collector full’ indicator prevents overfilling and blockages
  • Extended five-year manufacturer’s warranty
Mountfield S421R-HP
Mountfield S421R-HP Hand-Propelled Petrol Rear-Roller Lawnmower £399.00 Original price was: £399.00.£349.00Current price is: £349.00.
Mountfield S421R-HP
Mountfield S421R-HP Hand-Propelled Petrol Rear-Roller Lawnmower
£399.00 Original price was: £399.00.£349.00Current price is: £349.00.
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Mountfield S421R-HP Hand-Propelled Petrol Rear-Roller Lawnmower

If you’re maintaining a less substantial lawn, and like the idea of the traditional striped finish, this quality rear-roller mower from trusted UK brand, Mountfield, could well be the machine for you!

Powering the Mountfield S421R-HP Hand-Propelled Petrol Rear-Roller Lawnmower is a Stiga ST 120 OHV engine; a 123cc four-stroke unit, which, thanks to its overhead-valve configuration, offers a reduction in noise, vibration and emissions.

A roomy 0.8-litre fuel tank works with the engine’s fuel efficient design to ensure plenty of ground can be covered between top-up breaks; Stiga’s recoil-starter technology makes achieving ignition a straightforward, stress-free operation.

The Mountfield S421R-HP Hand-Propelled Petrol Rear-Roller Lawnmower gives the user the choice of five cutting-heights between 20-70mm, so you’ll be able to achieve a nice low cut on formal lawn areas, at the same time being able to tackle longer grass when needed (adjustments are made using a single lever).

It comes equipped with a high-capacity 55-litre grassbag that combines with the capacious fuel tank to keep downtime to a minimum, and it’s fitted with collapsible handlebars, so you’ll have no trouble finding a space for it in the shed.

The hand-push design of the Mountfield S421R-HP makes it possible to mow safely and accurately around obstacles, as it won’t run away with you, which can sometimes be the case with self-propelled models. The full-width roller also means you can mow right along the edge of your lawn, and won’t have to tidy the borders afterwards.

The compact 41cm cutting-width on this model makes it perfect for small-medium lawns up to around 400m2.

For four-stroke engine oil, click here.

It should be noted that Mountfield petrol lawnmowers are covered by an extended five-year manufacturer’s warranty*.

* Ts & Cs apply – to maintain a valid warranty, the machine must be serviced annually from year two onwards by an authorised dealer

Additional information



Engine Make


Engine Model

ST 120 Autochoke OHV

Engine Capacity


Engine Power

2.5hp / 1.9kW @ 2900rpm

Engine Starting System


Engine Fuel-Tank Capacity

0.8 Litres


Hand Propelled

Rear Roller


Cutting Width


Cutting Heights

20-70mm (5 Positions)

Height Adjustment

Single Lever

Grass Collector

55 Litres

‘Grassbag Full’ Indicator




Cutting Deck



Foldable / Adjustable with Soft Grip


Front 180mm / Rear-Roller 127mm – Ball-Bearing Mounted with Grooved Tread

Safety Features

Operator Presence Control

Sound Level

96 dB(A)

Lawn Size

Up to 400m2

Product Weight



5 Years


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Shipping Info

Shipping Info

If you’re buying a boxed product, we aim to get your order delivered next working day – UK mainland where possible.

If you’re buying a tractor or ride-on mower – a special order item – it could be slightly longer, as we need to PDI the machine.

We do try and van-deliver these machines if we can, as this gives us a chance to demonstrate the product, and to ensure you’re happy and confident with your purchase.

If we can’t van-deliver your machine, as you’re out of our local delivery area, the tractor will be sent on a pallet via a courage company. They will then contact you directly to book a specific day and time that suits you.