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S421R PD

Petrol lawn mower

  • Free White Glove delivery Free delivery: the product will be assembled and prepared by a local Mountfield authorised dealer.
Get your stripe on' with this fantastic roller mower from Mountfield. The S421R PD is a stylish self-propelled petrol lawnmower equipped with a rear roller - ideal for producing the perfect lawn stripes! The punchy STIGA ST140 Autochoke engine and impressive 41cm cutting width makes light work of small lawns. What more could you ask for?
  • Powered by STIGA 139 cc petrol engine
  • Rear Roller for a lovely striped finish
  • Self-propelled with fixed forward speed 4.1km/h
  • 41cm cutting width
  • 55-litre hybrid with full indicator grass collector
  • Centralised height of cut adjustment
  • Free Shipping
Vat Included

Product details and specs

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If its lawn stripes you are looking for - look no further than the S421R PD roller lawnmower.

At the heart of this self-propelled petrol mower is a reliable STIGA ST140 Autochoke engine that drives the 41cm wide cutting blade - giving your lawn the perfect finish. Grass clippings are collected in the handy 55-litre canvas hard top collector complete with 'bag full' indicator. Other features include a rear roller for laying down those all important stripes and a robust steel chassis in Mountfield red! All backed by a 5 year extended warranty (T&C's apply) for added peace of mind. The S421R PD roller mower is an excellent choice for small gardens.

For advice on the Lawnmower best suited to your requirements please call our Technical Helpline on 0800 669 6325 or contact your local Mountfield Dealer ( who will be happy to advise you.

Delivery Information: There is an option to have this Lawnmower delivered by our premium ‘Ready to Mow’ white glove delivery service. To qualify for this service please ensure you select this delivery service at checkout. Your local Mountfield authorised dealer will prepare the machine with a thorough pre-delivery inspection and deliver it ready to use at a time convenient to you. They will also demonstrate its safety features and how to use the machine.

Please allow up to 7 working days for delivery, however, if your local dealer has the machine in stock then delivery would normally be much sooner.
This premium delivery service is available free of charge with this machine.

What's in the box

S421R PD
S421R PD
Petrol lawn mower
  • lensGrass bag
  • lensRoller

Technical specs

General info
2.2 kW
Power source
Engine Brand
Engine model
ST 140 OHV Autochoke Powered by STIGA
139 cm³
Engine rotation speed
2900 rpm
RPM control
Fixed rpm
Fuel tank capacity
0.75 l
Engine Oil tank capacity
0.5 l
Suggested working area
300 ㎡
Cutting system
Cutting width
41 cm
Deck material
Cutting height adjustment
Cutting height positions
5 positions
Cutting height range
20 - 70 mm
Drive system
Rear-roller drive
Speed forward
4.1 Km/h
Collector capacity
55 l
Handlebar type
Ergonomic + soft grip
180 mm /ROLLER grooved wheels on ball bearings
Front handle
Yes (bumper)
Adjustable handlebar
Foldable handlebar
Washing link
Collector type
Hybrid with warn
Vibration and noise data
Guaranteed sound power level (LwA) - dB(A)
Measured sound power level dB(A)
Measured sound pressure level at operator ear dB(A)
Vibration level hand (m/s2)
Overall dimensions
Pack weight
35.4 kg
Product length
1500 mm
Product width
490 mm
Product height
1120 mm
32 kg


Should the petrol lawn mower be protected from rain?
All petrol lawn mowers are IPX4 certified, meaning that they are not damaged by rain. However, it is recommended to keep the petrol lawn mower in a garage or store it indoors. Full information can be found in the instruction manual.
Is this petrol lawnmower already assembled in the box?
The petrol lawn mower is almost fully assembled when you open the box. The main parts have been put together and the remaining elements are easy to assemble. Follow the directions in the instruction manual to ensure the petrol lawnmower is assembled correctly.
How should this petrol lawn mower be cleaned after use?
We recommend cleaning the lawn mower in the normal way after each use. Before washing the lawn mower, we suggest that any residual grass or top soil is removed using the special scraper, which can be purchased separately. Next, the inside of the chassis can be washed with water.
Follow the steps described in the user manual.
Which fuel and engine oil are recommended for this petrol mower?
You should use petrol as fuel. In terms of engine oil, we recommend using the specific oil, which can be purchased separately. This will guarantee the best engine performance and optimal lubrication.
How should the oil level be measured on this petrol lawn mower?
To correctly measure the oil level, you need to make sure the petrol lawnmower is on a flat surface, unscrew the cap which has a built-in dipstick for measuring, clean off any oil on the dipstick and reinsert it without screwing it in. Take the dipstick back out and check the level, which must lie between the MIN and MAX values. Top up, if required, and screw the cap back on. Full details can be found in the engine manual.
Where can I purchase a new blade for my petrol lawn mower?
When purchasing a new blade for your petrol mower, we recommend that you contact an authorised Mountfield dealer. To find your nearest retailer, go to the "find a distributor" section of the website's main menu.

Free Delivery
Only on selected models

Free returns
within 14 days


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