Mountfield SP41 Review UK 2026
Quick verdict
Score: 8.4/10
Best for: Keeping your lawn tidy to suit its size and terrain
Not for: A lawn much bigger or rougher than this mower is built for
Bottom line: A capable lawn mower (petrol mower, 39cm cutting width, 123cc petrol engine) for a well-kept lawn.
The Mountfield SP41's SP41 is a self-propelled petrol lawn mower built around a 123cc ST120 Autochoke engine and a 39cm cutting width, so it covers a moderate strip each pass for typical garden mowing. It suits owners who want a petrol mower for regular grass areas up to the stated 250m², with grass box collection for easier tidy-up. The 39cm deck helps reduce the number of passes compared with narrower models.
Key specifications
| Spec | Value Notes |
|---|---|
| Engine | 123cc ST120 Autochoke |
| Cutting width | 39cm Collector use |
| Working area | Up to 250m² Yard sizing |
Pros
- Petrol mower
- 39cm cutting width
- 123cc petrol engine
- Self-propelled
- Grass box collection
Cons
- Petrol needs fuel, oil and more maintenance
- Match the cutting width and power to your lawn size
- Heavier models are harder to manoeuvre and store
Mower Type and Power
Powered by a 123cc ST120 Autochoke petrol engine, this lawn mower is a self-propelled lawn mower designed to reduce the pushing effort during mowing runs, particularly on uneven ground or when the lawn is thicker. The Autochoke feature is intended to help starting by automatically managing choke settings. It is aimed at typical garden mowing up to the stated 250m².
Cutting Width and Deck
With a 39cm cutting width, the Mountfield covers a moderate strip of grass each pass, which can help keep mowing sessions from becoming too slow compared with narrower decks. For best results, the user should overlap the previous mowing line slightly, so uneven patches do not stay long. On larger areas, the 39cm cutting width means steady pacing matters, especially around edges and obstacles where narrower manoeuvring may be required.
Lawn Size and Collection
A 39cm cutting width sets the pace and helps determine how long it takes to clear a typical lawn, so matching the mower's work size matters. The lawn mower is rated for up to 250m², which makes it suitable for small to mid-sized gardens rather than large estates. It uses a grass box for collection, collecting clippings as it cuts. For best results, plan short passes, start at the edge and work inward, and empty the 40L box when full to keep airflow consistent. Larger lawns will require more stops.
Ease of Use and Storage
The Mountfield is designed for straightforward operation and compact storage, aided by its 39cm cutting width and a grass box for collecting clippings. It is powered by a 123cc petrol engine, so it does not depend on battery charging routines. For day-to-day handling, the 39cm deck helps it work through narrower paths, and it is specified for lawns up to 250m² when used as directed. After mowing, the grass box can be emptied and reattached, although storing it may still require careful positioning depending on shed layout.
Who Is This Lawn Mower For?
This lawn mower is for people who want a petrol self-propelled option for routine garden mowing, particularly where the lawn is larger than a small courtyard. It is suitable for homeowners with up to a 250m² working area, with a 39cm cutting width that helps cover more ground at a steady pace. The 123cc ST120 Autochoke petrol engine suits users who prefer petrol power rather than cordless batteries. Grass collection is supported with a 40L collector, making it suitable for anyone who wants to collect clippings in the box. It may be less suitable for very small lawns or tight storage spaces, where lighter mowers can be easier.
Where to Buy in the UK
Finding a suitable retailer for the lawn mower is a practical next step. The model is a petrol, self-propelled lawn mower with a 39cm cutting width and a stated working area of up to 250m², so these details should be used to check that a listing matches the correct variant rather than relying on general descriptions. In the UK, buyers can look at major garden power-equipment shops as well as large mainstream retailers and established online sellers with clear product pages. When comparing listings, confirm it is the SP41 petrol model with the 123cc ST120 Autochoke engine and that the grass collector is included.
Frequently Asked Questions
Is the Mountfield SP41 worth it?
For keeping a lawn tidy with the least hassle, the Mountfield (a petrol mower) does the job with a 39cm cutting width. Whether it suits you comes down to your lawn size, terrain and how much effort you want to put in. Check the current Amazon UK price, as mowers are often discounted in season.
What type of mower is the lawn mower?
The Mountfield is a petrol mower. Petrol mowers are powerful and cordless for big or rough lawns; cordless battery mowers are quiet and low-maintenance for most gardens; corded electric are light and cheap for small lawns; hover mowers glide for edges and slopes; manual push mowers are eco and silent for tiny lawns. Choose the type for your lawn size and terrain.
What is the cutting width of the lawn mower?
This lawn mower has a 39cm cutting width. A wider deck cuts more grass per pass so you finish faster - better for bigger lawns; a narrower deck is lighter and more manoeuvrable around borders and obstacles. Match the width to your lawn size and how tight the spaces are.
What lawn size does the Mountfield cover?
The Mountfield SP41 is rated for up to 250m² working area. With robotic mowers it's important the working area comfortably exceeds your actual lawn, allowing for shape and slope. If your garden is close to the limit, size up to a model rated for a larger area.
How powerful is the lawn mower?
This lawn mower runs on a 123cc petrol engine. Petrol engines give strong, sustained cutting power for long grass and large lawns.
Is the Mountfield self-propelled?
Yes - the lawn mower is self-propelled, so it drives itself forward and you simply steer. That's a real help on larger lawns or any slope, saving you pushing the full weight of the mower. On small flat lawns a push mower is fine and lighter.
Does the Mountfield collect or mulch the grass?
The lawn mower collects clippings into a grass box as you mow, so you get a clean finish and simply empty it when full. Check the grass box capacity against your lawn size to avoid frequent stops.
Is the Mountfield SP41 easy to store?
Storage depends on the design - many electric and cordless mowers fold or stand upright to save space, while petrol and ride-on mowers need more room. This lawn mower is a typical example for its type; if space is tight, look for a compact-fold or upright-storage model like Flymo's EasiStore range.