Masseys DIY Store

Mountfield SP42 Petrol Lawn Mower

Original price was: £309.00.

, , ,

Availability: In stock

The Mountfield SP42 petrol lawn mower –

Why purchase a Mountfield Lawn Mower from Masseys?

  • A long established family business
  • Masseys will assemble your lawn mower and add the oil and fuel for only £15
  • Lawn Mower in stock and on show in our showroom
  • Product can be assembled and delivered to your door
  • Local delivery available

Any questions? – Send us an email

Whether you buy the machine boxed, or opt to have this additional service, Masseys will always provide the in-store help and advice, dedicated workshop, and warranty backup from a trusted Mountfield dealer

Lawn Mowers

Mountfield SP42 Lawn Mower

The Mountfield SP42 lawn mower is not only our cheapest self-propelled lawnmower with a mulching facility, but is also a fantastic option that is ideal for small to medium-sized lawns up to 20m x 20m. It has a 41cm width of cut and a powerful Stiga 123 cc engine.


The lawn mower has a single lever height of cut with six positions. These range from 22 – 65 mm. The grass bag is large 60 litres and it has a bag indicator located on top of the box. Another great advantage of the SP42 is that it comes with a mulching plug, so you can cut the grass without collecting it. This means the grass will decompose and act as a natural fertiliser.

Push version also available – Mountfield HP42 Petrol Lawn Mower

2 year warranty is included with the Mountfield SP42.

What else will I need to buy with my SP42 lawn mower?

  • Lawn mower oil
  • Petrol / Aspen Fuel
  • OR, Masseys will assemble and check your lawn mower, add the correct amount of engine oil and add some fuel all for just £15, so it is ready to cut grass! It is on show in our showroom in Swadlincote.


As said, the Mountfield SP42 lawn mower represents excellent value for money. It is powered by a Stiga ST120 123cc 4 stroke engine and the Mountfield SP42 is self proplled making it ideal for small to medium sized lawns. The engine is very easy to start, with a standard recoil rope system and will give many years of trouble-free mowing. Reliability can be increase by using Aspen fuel which will not deteriorate for up to 5 years.

If you would prefer not to collect the grass cuttings you could choose to mulch using the mulching included; recycling grass clippings back into your lawn can save you time, money and effort.

This great little mower is a light and easy to use and extremely economical to run and with fold down handles making it easier to store. The tough hammered steel deck is not only stylish but hard wearing and will give you many years of service.

If you didn’t want self-propelled, you might want to consider the Mountfield HP42 model or view our full range of Mountfield lawn mowers.

Mountfield SP42 Specification

Engine Brand Mountfield
Engine Type ST120 OHV
Engine Capacity 123cc
Net Power Output 1.90kW @ 2900rpm
Starting Method Recoil
Drive Self Propelled
Cutting Width 41cm /16″
Cutting Heights 22-65mm (6 Positions)
Cutting Height Adjustment Single Lever
Roller No
Collecting Yes
Mulching Yes
Collector Canvas with hard top 60 litres
Chassis Steel
Fuel Tank Capacity 0.75 Litres
Lawn Size 20m x 20m
Collapsible Handles Hand Wheel
Safety Features Operator Presence Control
Included Accessories Mulching Plug
Wheels Front 200mm Rear 200mm
Warranty 2 Years
Washing Link No
Vibration Level
dB(A) Rating
Weight 25kg

Fuel Stabiliser

Please use a fuel stabiliser or Aspen fuel with your lawn mower.


Mountfield Universal Fuel Stabiliser contains a carefully balanced formulation based on light hydrocarbon fractions and components specially selected for their performance enhancing properties:

  • Prevents the degradation of fuel – fuel stays fresh for up to 2 years.
  • Protects the fuel against oxidation.Prevents gum and varnish build up.
  • Protects the engine and fuel system parts against rust and corrosion.

Modern petrol now typically contains 5% ethanol. Ethanol readily bonds with atmospheric moisture creating an ethanol-water mix and this oxidisation creates what is known as stale fuel.
As fuel oxidises it can turn to gum and clog jets and other openings in the fuel system. Gummed up carburettors cause serious problems in power equipment such as lawn mowers that see intermittent use or have long periods of storage.

Ethanol blended fuel is also a corrosive substance that can cause the gradual destruction of the metal used in the fuel systems of outdoor power equipment (particularly soft metals such as brass and aluminium). Ethanol also absorbs water, drawing it into the fuel mixture. Water is highly corrosive and when ethanol and water combine it can cause performance problems and fuel system damage.
Good quality fuel stored in an airtight container should stay stable, not oxidise and stay fresh. However the typical fuel tank of a lawn mower isn’t ideal for storing fuel. It isn’t 100% airtight, so fuel will oxidise in the tank, and over time (as little as 30 days) will go stale.

What is Aspen fuel and why do we recommend it?Aspen 4

There are many reasons why people choose to use Aspen in their garden machinery.

All of these benefits contribute to a better all-round experience whilst using your machinery, making your gardening easier and more enjoyable.

The advantages:

  • No expensive repair bills caused by stale fuel
  • Your machine always starts and is ready to go, even after long standstill periods
  • Lasts for years without deterioration
  • Aspen does not contain ethanol
  • Virtually odourless
  • Less maintenance and a longer machine life
  • Available in a conveniently sized container
  • Premixed 2-stroke eliminates the need to mix yourself
  • Easy to select the correct fuel using the coloured cans and coloured reminder stickers on your machine
  • Protects your health and the environment
Weight 1 kg

You may also like…

Mountfield SP42 Lawn MowerMountfield SP42 Petrol Lawn Mower
Original price was: £309.00.

Availability: In stock