Mountfield S421R PD Petrol Lawnmower

Description

Create a classic British striped lawn with the Mountfield S421R PD self-propelled petrol roller lawn mower – a powerful, reliable and easy-to-use machine designed for small to medium gardens. If you’re looking for crisp edges, defined lawn stripes and a professional finish, this petrol roller mower delivers impressive results every time.

Powered by a dependable 139cc STIGA ST140 Autochoke petrol engine, the S421R PD provides consistent performance with simple, fuss-free starting. The Autochoke system automatically sets the correct fuel mix, so there’s no need for priming or manual adjustments – just start and mow. Its 41cm cutting width offers the perfect balance of manoeuvrability and efficiency, making it ideal for smaller lawns.

The integrated rear roller creates that sought-after striped effect while also providing extra stability along borders and edges. With a fixed forward speed of 4.1km/h, the self-propelled drive system takes the strain out of mowing – simply guide the mower and let it do the hard work.

Grass clippings are collected in the generous 55-litre hybrid grass collector, combining a durable canvas bag with a hard top for improved airflow and performance. A handy ‘bag full’ indicator lets you know when it’s time to empty. The centralised height of cut adjustment allows you to quickly select the ideal cutting height to suit different grass conditions throughout the season.

Built on a robust steel chassis and finished in classic Mountfield red, the S421R PD is designed for durability as well as style. Backed by a 5-year extended warranty*, this self-propelled petrol lawn mower is an excellent choice for achieving a beautifully maintained, striped garden with minimal effort.

Key Features:

139cc STIGA ST140 Autochoke petrol engine
Self-propelled with fixed forward speed (4.1km/h)
Rear roller for a traditional striped lawn finish
41cm cutting width – ideal for small gardens
55-litre hybrid grass collector with full indicator
Centralised height of cut adjustment
Durable steel chassis
5-year extended warranty*

(*T&Cs apply)

Specification	Details
General info
EAN / UPC	8008984817401
SKU	299439043/M19
Power source	Petrol
Power	2.2 kW
Recommended mowing area	Up to 1000 m²
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
Cutting method	Collecting
Cutting width	41 cm
Deck material	Steel
Cutting height adjustment	Centralised
Cutting height positions	5 positions
Cutting height range	20–70 mm
Drive	Self-propelled
Traction	Rear-roller drive
Forward speed	4.1 km/h
Collector capacity	55 L
Handlebar type	Ergonomic with 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 indicator
Guaranteed sound power level (LwA)	96 dB(A)
Measured sound power level	95 dB(A)
Measured sound pressure level at operator ear	81.2 dB(A)
Vibration level (hand)	7.5 m/s²
Pack weight	34.7 kg
Product length	1500 mm
Product width	490 mm
Product height	1120 mm
Weight	32 kg

Please refer to our Delivery Policy

Additional Information

SKU: .NMS421RPD

Steve Robinson

22/08/2025

This is a fantastic business. The customer support is great and delivery was very prompt. We highly recommend them.

Dave Hunter

02/08/2025

Great experience over many years. Fantastic service from first enquiry through to purchase and installation. We were guided through the choices for a robot lawnmower by... Read More »