Mountfield S421R-PD Self-Propelled Petrol Rear-Roller Lawnmower

Original price was: £459.00.Current price is: £399.00.

  • A compact and easy to use self-propelled 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 using just one lever
  • Space saving collapsible handlebars
  • Roomy 55-litre catcher included
  • ‘Collector full’ indicator prevents overfilling, blockages and spillages

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Mountfield S421R-PD Self-Propelled Petrol Rear-Roller Lawnmower
£459.00 Original price was: £459.00.£399.00Current price is: £399.00.
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Mountfield S421R-PD Self-Propelled Petrol Rear-Roller Lawnmower

If you’re maintaining a smaller 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-PD Self-Propelled Petrol Rear-Roller Lawnmower is a Stiga ST 140 Autochoke engine; a 139cc four-stroke unit, which, thanks to its overhead-valve configuration, offers low-emission operation with reduced fuel consumption and less noise.

A roomy 0.75-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-PD Self-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 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, which 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 self-propelled design of the Mountfield S421R-PD means its driven forward by the rear roller, thereby taking pretty much all of the effort out of maintaining your lawn. The full-width roller also means you can mow right along the edge of your lawn, and therefore won’t have to tidy the borders with a strimmer or clippers afterwards.

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

Additional information



Engine Make


Engine Model

ST 140 Autochoke OHV

Engine Capacity


Engine Power

3hp / 2.2kW @ 2900rpm

Engine Starting System


Engine Fuel-Tank Capacity

0.75 Litres


Self Propelled

Rear Roller


Cutting Width


Cutting Heights

20-70mm (5 Positions)

Height Adjustment

Single Lever

Grass Collector

55 Litres – Canvas with Hard Top

‘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

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.

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