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MOUNTFIELD S421 R PD ROLLER MOWER Petrol lawn mower

£399.00 £332.50

Availability:In Stock

  • Brand: Mountfield
  • Product Code: DYMTF007
SKU
DYMTF007

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Mountfield S421R PD Self-Propelled Petrol Rear Roller Lawnmower – Perfect Stripes, Powerful Performance

Create a classic striped lawn finish with the stylish and powerful Mountfield S421R PD Rear Roller Petrol Lawnmower. Designed for small to medium gardens, this premium self-propelled mower combines a robust 139cc STIGA ST140 Autochoke engine, a 41cm cutting width, and a rear roller to give your lawn that professional, striped look seen on bowling greens and cricket pitches.

Whether you’re enhancing curb appeal or simply taking pride in a well-kept garden, this high-performance petrol mower delivers precision, ease, and efficiency in every pass.

Technical Specifications:

  • Engine: STIGA ST140 Autochoke, 139cc

  • Drive Type: Self-propelled

  • Speed: Fixed 4.1 km/h

  • Cutting Width: 41cm

  • Grass Collector: 55L hybrid with full indicator

  • Chassis: Powder-coated steel

  • Height of Cut: Centralised adjustment with multiple positions

  • Warranty: 5-year extended warranty (T&Cs apply)

Perfect For:

  • Creating a traditional striped finish

  • Small to medium-sized gardens

  • Users seeking a stylish, dependable petrol mower

  • Gardeners who want effortless mowing with premium features

Care Tips & Assembly Guidance:

  • Store indoors or in a dry shed to extend product life

  • Clean after use with water; use a scraper (sold separately) to remove debris

  • Use unleaded petrol and recommended engine oil (sold separately)

  • Always check the oil level before use following the included instructions

Mountfield S421R PD – Power Meets Precision for the Perfect Striped Lawn

Combining British garden tradition with modern engineering, the S421R PD delivers a striking finish and reliable mowing performance—ideal for lawn lovers who won’t settle for less.

Technical Specifications:

EAN/UPC 8008984817401
Power source Petrol
Power 2.2 kW
Engine Brand STIGA
Engine model ST 140 OHV Autochoke Powered by STIGA
Displacement 139 cm³
Engine rotation speed 2900 rpm
RPM control Fixed rpm
Starter Recoil
Fuel tank capacity 0.75 l
Engine Oil tank capacity 0.5 l
Mowing area 300 ㎡
Cutting width 41 cm
Deck material Steel
Cutting height adjustment Centralized
Cutting height positions 5 positions
Cutting height range 20 - 70 mm
Driving Self-propelled
Traction Rear-roller drive
Speed forward 4.1 Km/h
Collector capacity 55 l
Handlebar type Ergonomic + soft grip
Wheels 180 mm /ROLLER grooved wheels on ball bearings
Front handle Yes (bumper)
Adjustable handlebar Yes
Foldable handlebar Yes
Washing link No
Collector type Hybrid with warn
Guaranteed sound power level (LwA) - dB(A) 96
Measured sound power level dB(A) 95
Measured sound pressure level at operator ear dB(A) 81.2
Vibration level hand (m/s2) 7.5
Pack weight 35.4 kg
Product length 1500 mm
Product width 490 mm
Product height 1120 mm
Weight 32 kg

Key Features & Benefits

Classic Striped Lawn Finish -Thanks to the integrated rear roller, this mower creates a beautiful, defined stripe effect, adding elegance to your garden.

Powerful 139cc STIGA ST140 Autochoke Engine -Delivers reliable power for consistent mowing performance and quick, hassle-free starts—no need to prime or choke.

Self-Propelled with Fixed Speed (4.1 km/h) -Move effortlessly across your lawn, even on slopes, without pushing. The self-drive system helps reduce fatigue and saves time.

41cm Cutting Width -Ideal for smaller lawns or compact gardens, offering a great balance of manoeuvrability and coverage.

55L Hybrid Grass Collector with Fill Indicator -A durable canvas and hard-top design with a full-bag indicator prevents unnecessary stops and lets you know when to empty the clippings.

Centralised Height Adjustment -Choose from multiple cutting heights to suit your lawn’s needs—all adjustable with a single lever for quick and precise control.

Rugged Steel Chassis -Built to last, the mower’s tough steel deck stands up to regular use and resists corrosion, while retaining a manageable weight.

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Faqs

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.
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.
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.
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.
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.
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