We offer a free delivery service for all machines within a 30 mile radius. Not only that; we build, inspect and run up every machine prior to delivery. Making sure you get a fully functional machine that is set-up and ready for use. On delivery we will run through with you any instructions & maintenance advice so you are comfortable with your new machine.
Mountfield SP42 16" Petrol Lawn Mower
Original price was: £309.00.£269.00Current price is: £269.00. inc. VAT
Mountfield HW531 PD 21" Petrol Lawn Mower
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Mountfield SP46 18″ Petrol Lawn Mower
Original price was: £339.00.£299.00Current price is: £299.00. inc. VAT
The Mountfield SP46 is a fantastic self-propelled petrol mower, perfect for medium-sized lawns. Featuring a reliable STIGA engine and a 46cm cutting width, it combines ease of use with a professional finish.
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Description
Why buy the Mountfield SP46 18″ Petrol Lawn Mower?
- Powered by a reliable STIGA ST 140 OHV 139cc Autochoke engine.
- Self-propelled drive system for effortless mowing on slopes and uneven ground.
- Generous 46cm (approx. 18″) cutting width, ideal for medium-sized lawns up to 1200 m².
- Versatile 3-in-1 cutting system: collect, mulch, or rear discharge.
- Large 60-litre hybrid grass collector with a ‘bag full’ indicator.
- Single-lever, centralised cutting height adjustment with 6 positions (22-65mm).
A Hardworking Mower for Medium-Sized Lawns
The Mountfield SP46 is a hugely popular self-propelled petrol lawn mower, expertly designed for homeowners seeking a reliable and straightforward machine. It’s an ideal choice for maintaining medium-sized lawns up to 1200 m², offering a perfect balance of power, performance, and user-friendly features. Its robust build and dependable engine make it a standout walk-behind mower for the British garden.
Powerful and Reliable STIGA Engine
At the heart of the SP46 is the high-performance STIGA ST 140 OHV Autochoke engine. This 139cc petrol engine provides consistent and reliable power, making light work of thick grass and undulating terrain. The Autochoke system ensures easy starting from cold, so you can get to work without hassle. With a fixed RPM of 2900, the engine delivers optimal power for a clean and efficient cut every time.
Efficient Cutting & Collection
The SP46 boasts a robust 46cm steel cutting deck, ensuring durability and a precise cut. Adjusting the cutting height is simple, thanks to a centralised single lever offering six different positions, ranging from 22mm to 65mm. This versatility allows you to adapt to varying grass conditions throughout the season. Clippings are efficiently gathered in the spacious 60-litre hybrid grass collector, which features a handy ‘bag full’ indicator to prevent overfilling and blockages.
Mulching for a Healthier Lawn
For those who prefer to save time and naturally fertilise their lawn, the SP46 comes with a mulching plug as standard. By inserting the plug, the mower finely chops the grass clippings and redistributes them back onto the lawn surface. This process returns valuable nutrients to the soil, promoting healthier, greener growth and eliminating the need for trips to the compost heap.
Designed for Durability and Comfort
Built with a sturdy dark grey steel chassis, the Mountfield SP46 is made to last. The self-propelled rear-wheel drive, moving at a comfortable 3.7 Km/h, takes the strain out of mowing, especially on sloped gardens. User comfort is enhanced by the ergonomic, soft-grip handlebar, which is both adjustable and foldable for easy storage. Weighing just 26kg, it remains easy to manoeuvre around garden obstacles.
As an authorised UK dealer for Mountfield, Sims Garden Machinery provides more than just a box. With a heritage spanning over 100 years, the business offers expert guidance and complete peace of mind. The team invites customers to visit the Stratford-upon-Avon showroom to see a wide range of walk-behind mowers. The trained sales staff can provide tailored advice, while the workshop’s trained mechanics ensure comprehensive aftersales support. For local customers, every Mountfield SP46 petrol lawn mower comes with a free Pre-Delivery Inspection (PDI), local delivery, and a full handover demonstration, ensuring the machine is ready to use and the operator is confident in its functions. This commitment to service sets Sims apart from online-only retailers.
Not sure which machine or part is right for you?
Our team is here to help. Contact us today for expert advice.
Our team is here to help. Contact us today for expert advice.
Technical Specification
| Specification | Value |
|---|---|
| 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 |
| Starter | Recoil |
| Fuel Tank Capacity | 0.75 L |
| Engine Oil Tank Capacity | 0.5 L |
| Maximum Mowing Area | 1200 m² |
| Driving | Self-propelled |
| Traction | Rear-wheel drive |
| Speed Forward | 3.7 Km/h |
| Cutting Method | Collecting, Mulching, Rear discharge |
| Cutting Width | 46 cm |
| Deck Material | Steel |
| Cutting Height Adjustment | Centralized |
| Cutting Height Positions | 6 positions |
| Cutting Height Range | 22 – 65 mm |
| Collector Capacity | 60 L |
| Collector Type | Hybrid with warn indicator |
| Handlebar Type | Ergonomic + soft grip (Adjustable & Foldable) |
| Wheels | 200 / 200 eco grooved wheels on bearings |
| Guaranteed Sound Power Level (LwA) | 96 dB(A) |
| Weight | 26 kg |
| Product Dimensions (L x W x H) | 1570 x 540 x 1100 mm |
| SKU | 2L0482048/M21 |
| EAN/UPC | 8008984839090 |
Why buy from Sims Garden Machinery?
Authorised main dealer
We are authorised dealers for leading brands, meaning genuine parts, manufacturer-approved training, and warranty support you can rely on.
Real people, real support
No call centres. No ticket systems. Just a knowledgeable local team you can speak to when you need help.
Expert advice — not pushy sales
Our team are trained mechanics and product specialists, so you get honest, practical advice based on how you’ll actually use the machine.
Established, independent family business
We’re a long-standing independent dealer with deep roots in the local area — built on reputation, repeat customers, and word of mouth.
Frequently Asked Questions
What size garden is the Mountfield SP46 suitable for?
The Mountfield SP46 is ideally suited for medium-sized gardens, with a recommended maximum mowing area of up to 1200 square metres. Its 46cm (approx. 18″) cutting width and self-propelled drive make it efficient for lawns of this size.
What are the cutting options for this lawn mower?
This is a versatile 3-in-1 mower. You can choose to (1) collect the clippings in the large 60-litre grass bag, (2) use the included mulching plug to finely chop and return nutrients to the lawn, or (3) use the rear discharge option for when collection is not necessary.
Does this mower come assembled?
The mower arrives from the manufacturer mostly assembled in the box, requiring only simple steps like attaching the handlebar. However, when you purchase from an authorised dealer like Sims Garden Machinery, local customers benefit from a free Pre-Delivery Inspection (PDI), which means the machine is fully built, tested, and filled with oil and fuel by our trained mechanics before delivery.
How do I adjust the cutting height on the SP46?
The cutting height is very easy to adjust. The SP46 features a centralised height adjustment system, controlled by a single lever located next to one of the rear wheels. This lever allows you to select from 6 different cutting heights, ranging from 22mm to 65mm, to suit the condition of your lawn.
User Manuals / Downloads
Additional information
| Brand | Mountfield |
|---|---|
| Engine SizeThe displacement of the engine in cubic centimetres (cc). | 139 |
| Blade Brake ClutchIndicates if the blade can be stopped while the engine keeps running. | FALSE |
| Collector SizeThe capacity of the grass collection bag or box in litres. | 60 |
| Cutting MethodThe cutting mechanism used (e.g., Rotary or Cylinder). | Rotary |
| Cutting WidthThe width of the grass cut in a single pass. | 46 cm |
| Deck MaterialThe material the cutter deck is constructed from (e.g., Steel, Aluminium). | Steel |
| Drive TypeHow the mower is propelled (e.g., Push, Self-Propelled, Variable Speed). | Self-Propelled |
| Electric StartIndicates if the machine features a key or push-button electric starter. | FALSE |
| Mowing FunctionsAvailable mowing modes (e.g., Collection, Mulching, Side-Discharge). | [“Collection”,”Mulch”,”Rear-Discharge”] |
| Power Output (HP)The tool\'s power output measured in horsepower (hp). | 2.9 |
| Power Output (kW)The tool\'s power output measured in kilowatts (kW). | 2.2 |
| Rear RollerIndicates if the mower features a rear roller for creating lawn stripes. | FALSE |
| Power SourceThe primary energy source (e.g., Petrol 4-stroke, Battery, Electric). | Petrol |
| UNIVERSAL-Collection Type | Collect |
| WB-Mower Type? | Rotary |
| WB-Cutting Width | 18″ |
| WB-Propulsion Type | Self-Propelled |
| WB-Starting Method | Pull (Recoil) |
| WB-Wheel Type | Wheels |
Specification
Specification
| GENERAL INFO | |
| SKU | 2L0482048/M21 |
| CUTTING SYSTEM | |
| Cutting method | Collecting, Mulching, Rear discharge |
| Mulching function | Yes |
| Cutting width | 46 cm |
| Deck material | Steel |
| Cutting height adjustment | Centralized |
| Cutting height positions | 6 positions |
| Cutting height range | 22 – 65 mm |
| EQUIPMENT | |
| Collector capacity | 60 l |
| Handlebar type | Ergonomic + soft grip |
| Wheels | 200 / 200 eco grooved wheels on bearings |
| Adjustable handlebar | Yes |
| Foldable handlebar | Yes |
| Collector type | Hybrid with warn |
| OVERALL DIMENSIONS | |
| Pack weight | 29 kg |
| Product length | 1570 mm |
| Product width | 540 mm |
| Product height | 1100 mm |
| Weight | 27 kg |
| POWER | |
| 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 |
| Maximum working area | 500 m² |
| DRIVE SYSTEM | |
| Traction | Rear-wheel drive |
| Driving | Self-propelled |
| Speed forward | 3.7 Km/h |
| VIBRATION AND NOISE DATA | |
| Guaranteed sound power level (LwA) – dB(A) | 96 |
| Measured sound pressure level at operator ear dB(A) | 83 |
| Vibration level hand (m/s2) | 5.9 |
| Measured sound power level dB(A) | 96 |
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About Mountfield
At Sims Garden Machinery we stock a wide range of Mountfield garden equipment. We offer a range of lawn tractors and rider mowers, suited for commercial lawn maintenance. We also have a range of regular lawn mowers, in both petrol and electric models. We stock cordless hedge trimmers and grass trimmers, along with more specialist gardening equipment like pole pruners. Finally, we have spare batteries for cordless lawnmowers, and battery charging stations.
We can deliver Mountfield garden equipment across the UK. Upon arrival a member of our team will assemble and demonstrate your equipment to you, ensuring safe and correct usage.
Our industry-trained sales team are available to help with any queries you have about our range of Mountfield gardening equipment. Speak to a member of our team today to discuss lawnmowers, hedge trimmers, or accessories. At Sims Garden Machinery we have been selling high-quality gardening equipment for over 100 years, remaining a family-run business.
Shipping & Delivery
FREE PDI, DELIVERY & HANDOVER
NATIONAL DELIVERY
- Each machine will be tested prior to delivery.
- Orders will be sent out via either ThePalletNetwork or DHL insured service.
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