Mountfield SP41













  • Self-Propelled
  • Adjustable Height, Front and Rear
  • Lightweight
  • Foldable
  • 25-70mm cutting heights / 5 positions


  • No Mulching

Mountfield SP41 Review – Petrol Rotary Lawnmower, Grey (297412048/M17)

Summary of the Mountfield SP41

Mountfield SP41 Review

The Mountfield SP41 is a 4-stroke 2.1-horsepower petrol-powered lawn mower. It will cut the grass of a medium-sized garden, and the whole unit will fold down for storage. It has a good-sized 39cm blade and level of comfort to the user; it is self-propelled and lightweight at only 20Kg.

Main Features

  • Weight: 20 Kg (44.1lb)
  • Product Dimensions: 48×107×142 Centimetres (18.9×42.1×55.9in)
  • Self-Propelled Drive
  • Grass Collection Box: 40 L
  • Colour: Grey
  • Blade Length: 39 Centimetres (15.3in)
  • Material: Polypropylene
  • Fuel Tank: 0.85 Litre (29.9imp fl oz)


Mountfields RS 100 engines run on regular 95 unleaded petrol; there is no need to mix in engine oil. The manufacturers recommend fuel stabilizers in any machine that spends a lot of time sitting in storage. A stabilizer will prevent corrosion and keep the internals of the engine clean.

The engine oil goes into a separate tank; SAE30 4-stroke for lawn mowers is ideal. The mower will work with other brands of SAE30 oils; engine oil is not supplied in the kit. The RS100 OHV is a 100cc recoil (or pull cord) start engine, which produces a respectable peak 2.1-horsepower. To put it into perspective, the very first motor car had 3-horsepower.

  • 1.55kw (2.1hp)
  • 2800rpm
  • 95 Unleaded
  • Recoil Start

Mountfield SP41 Assembly Video

To give you a visual representation of the Mountfield SP41 please watch the video below:

Self-Propelled Drive

With a mower of this size and weight, you do not need engine help to move the machine, though it can become heavy when laden with damp grass. But with the Mountfield SP41, the engine is self-propelled, driving the blades and the rear wheels.

The Mountfield SP41 runs at a single speed of 3.4km/h (2.1mph), a slow walk, which is activated when the operator brake is pulled to allow the engine to move the blades. To engage the self-propelled mode, the operator lifts the throttle up towards the main bar to engage the clutch.

If you are looking for the hand propelled (push) model of the mower, then see my review of the Mountfield HP41 by clicking here.

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Height Adjustment

Mountfield SP41 Height

It is possible to adjust the cutting level on the Mountfield SP41 by moving the 2 levers on the front wheels. There is also a single rear lever that controls both rear wheels. These are quick lock mechanisms that ratchet 5 different height positions, from 25mm to 70mm (1 – 2.76 inches). Both front and rear wheels are the same size and made from formed plastic.

The owner may want to set the front wheels a little lower than the rear wheels to ensure they miss raised obstacles such as flagstones of chippings. Front-wheel levers do add a bit of hazard of having to approach the front wheels to adjust the height; you would want to turn the engine off first.

Cutting Diameter and Features

The blade length of the Mountfield SP41 is 39 centimetres (15 in). This may sound small, but the mower is intended for use on the lawns of 400m2 (4310ft2) or smaller. To put that into perspective, you would need to spend 10 minutes walking the 190 metres (623-ft) to mow a 20×20-metre (65x65ft) garden. Though the SP41 will work on larger gardens, a small fuel tank means it will need more trips back to base to refuel.

A larger blade equals more weight and complexity; if you have a small to medium garden, then this mower is a perfect size. A smaller blade will also draw less energy from the engine, which is what makes this design more efficient than some other models.

Roller (Stripes)

This Mountfield SP41 will not make stripes on the lawn. But, Mountfield does make a separate unit that you can pull along your lawn to make the striping effect. If this unit is going to be used on small lawns; taking a manual roller across your lawn is going to be a quick job.

Grass Box Capacity

Mountfield SP41 Height

The grass collection bag comes with the kit and consists of a wire frame over which a 40 litre ( bag hangs. This grass bag frame needs assembling before it can be hung from the back of the mower. Everything about this model’s design is about saving on weight and complexity. This includes the bag build, which is a simple and strong mesh fabric.


To start the engine on this Mountfield SP41, the operator needs to prime the engine with fuel; there is a small pump button set on top of the motor. After priming, the owner needs to stand behind the machine to hold the safety control and pull on the recoil cord.

The 0.85 litre petrol fuel tank is mounted to the back of the engine with a wide opening to accept regular petrol can spout. Mountfield has set the filling cap above the height of the mower to make it easier to miss the engine cowling.

Petrol mowers are inherently not quiet, but Mountfield has managed to keep the noise rating of this model to a very respectable 95 decibels.

Safety Features

There is no ignition key on this Mountfield SP41, so for added safety, Mountfield has gone with a presence control handle – the operator must have at least one hand griping the safety handle before the machine will start. If the control handle is released, even when pulling the throttle, the engine will stall.


There is no mulching on this mower, but you can use it without the bag and let the grass clipping exit via the rear chute. Mulching would make the clippings less visible and less likely to show on the lawn.

Mountfield SP41 Height

Mountfield SP41 Self Propelled Lawnmower User Manual Download

Click Here to download the Mountfield SP41 User Manual.

What’s Included in the Box?


  • Self-Propelled
  • Adjustable Height, Front and Rear
  • Lightweight
  • Foldable


  • No Mulching
Mountfield SP41 Height

Should You Buy this Mountfield SP41?

To keep the price down, they have used hollow plastic wheels and a plastic cowling over the blade. These are not an issue in themselves, but they would not be ideal on large and uneven surfaces.

The Mountfield SP41 machine is lightweight, and there is no reason not to think that this is a fantastic value mower for what Mountfield offers as a package. This is worth buying if you have a small to medium sized garden, and you want occasional use from it.


If you are looking for an entry-level mower, the Mountfield SP41 has everything you need for a small to a medium sized garden. The lack of mulching is not a big inconvenience since it is aimed at small lawns that would not produce that much grass.

Mulching is an effective way of distributing the cuttings without needing to re-empty the bag. It is unlikely that this 40 L grass collection bag would fill up on a small garden too quickly. The Mountfield SP41 is adjustable, safe, and easy to start. And the whole unit is foldable to make it convenient to store it in the tightest of spaces.

Where should I purchase this Mountfield SP41?

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Mountfield 297412048/M17 / SP41 Petrol Rotary Lawnmower, Grey
28 Reviews
Mountfield 297412048/M17 / SP41 Petrol Rotary Lawnmower, Grey
  • 39cm cutting width
  • Self propelled
  • 100cc Mount field Rs100 OHV engine
  • 25-70Mm cutting height/ 5 positions
  • 40 litre grass collector
  • 39cm cutting width

Last update on 2020-03-30 / Affiliate links / Images from Amazon Product Advertising API

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Want to lean more about what’s involved in maintaining a petrol lawnmower? Check out my guide 10 Simple Steps to Maintaining Your Petrol Lawnmower