MOUNTFIELD SP46 Petrol Lawnmower

SKU: M5-SP46-DOORBUSTER

Make mowing effortless with the Mountfield SP46. Its 46 cm cutting width, self-propelled drive, and 60-litre grass bag deliver reliable, clean results. Ideal for medium gardens. Includes mulching plug for a greener, healthier lawn.

RRP: £339

Our Price: £279.00 (inc VAT)

Only 3 left in stock

(11 customer reviews)

Only 3 left in stock

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About the MOUNTFIELD SP46 Petrol Lawnmower

Tackle Medium Lawns with Ease and Comfort

The Mountfield SP46 is a petrol mower designed to make lawn care simpler and more efficient. With a generous 46 cm cutting width, this mower is perfect for medium-sized gardens. The self-propelled drive means there’s no need to push, allowing you to work without added strain or effort. Whether your lawn is flat or slightly uneven, the SP46 glides across with consistent power and control.

Reliable Power from the STIGA Engine

At the heart of the SP46 is a dependable 139cc STIGA engine, delivering strong, reliable performance with every start. This engine features Autochoke technology, helping you start the mower quickly without fiddling with settings. Whether cutting long grass or maintaining a neat finish, this engine performs consistently well. It’s built for easy use and long-term reliability.

A Clean, Precise Finish Every Time

The 46 cm steel blade is engineered for sharp, accurate cutting. It creates a professional-looking result with minimal effort. You can adjust the cutting height centrally with a single lever, offering six different settings between 22 mm and 65 mm. This makes it easy to adapt to changing grass conditions or seasonal needs.

Spacious Grass Collection for Fewer Interruptions

Grass clippings are gathered into a 60-litre textile collector, letting you mow longer without emptying. The collector includes a ‘bag full’ indicator, showing exactly when it needs to be emptied. This clever feature saves time and prevents overfilling, helping you keep momentum as you work. The breathable fabric also encourages better airflow for cleaner collection.

Mulching Option for a Healthier Lawn

If you want to nourish your lawn naturally, the SP46 includes a mulching plug as standard. Simply insert the plug, and the clippings will be finely chopped and spread back over the lawn. This returns valuable nutrients to the soil, promoting thicker, greener grass over time. It’s an eco-friendly option that reduces waste and boosts lawn health.

Built to Last with Practical Features

The SP46 sits on a sturdy steel chassis, offering excellent durability throughout the mowing season. Its lightweight 26 kg design ensures it’s easy to handle and store between uses. Fold-down handles make compact storage simple, fitting neatly into most sheds or garages. The stylish dark grey finish adds a smart, professional look to the design.

Perfect for Medium-Sized Gardens

Whether you’re upgrading an older mower or choosing your first petrol model, the SP46 is a strong, dependable choice. Its self-propelled drive, high-performance engine, and large collector make mowing feel effortless. With a blend of modern features and proven reliability, it delivers superb value for regular garden care. Choose the SP46 for cleaner cuts, smoother handling, and a healthier-looking lawn.


Complete with a 2 year warranty.

MOUNTFIELD SP46 Petrol Lawnmower Technical Information

  • Engine Brand: Mountfield
  • Engine Type: ST140 engine
  • Net Power Output: 1.90kW @ 2900rpm
  • Starting Method: Recoil
  • Transmission: single speed 3.7km/h
  • Drive: Self propelled
  • Cutting Width: 46cm /18 inch
  • Cutting Heights: 22-65 mm (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: 40m x 40m
  • Collapsible Handles: Hand wheel
  • Safety Features: Operator presence control
  • Included Accessories: Mulching plug
  • Wheels: Front 200mm rear 200 mm
  • Warranty: 2 Years
  • Washing link: No
  • Vibration level: 5.9
  • dB(A) rating: 96
  • Weight: 26kg

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MOUNTFIELD SP46 Petrol Lawnmower Reviews

11 reviews for MOUNTFIELD SP46 Petrol Lawnmower

  1. Sandra Murdoch

    We were very please with our new lawnmower and delivery very good.

  2. Eileen George

    Great lawnmower cuts great and fairly light weight.

  3. Monica Patterson

    Arrived quickly – working well. Instructions poor. Nice cut of grass

  4. John norrington

    Very good service, kept up to date regarding delivery.
    Mower started first time and doesn’t disappoint.

  5. Christopher Bench

    Great Lawnmower – The instructions left a lot to be desired to be honest but once it was together it started straight away and has been cutting really well. The self propelled part takes the back breaking work out of it and makes it a joy to use. I have just under 1/4 acre of grass and it is perfect for this size.

  6. Chris

    Great mower…. Packaged and delivered in one piece…. Worked on the 1st pull…. Delivery was prompt and packaging was thorough

  7. CollectPlus Customer

    Cuts well and good self propel. Grass box not so good as it separates top from bottom long before full.

  8. Carol N

    Exceeded our expectations. Excellent quality and performance. The best price that we found online.
    Excellent customer service

  9. Mr John Halliwell

    Great mower easy to use and just right for the job

  10. customer

    Very good lawnmower. Instrunctions rather minimal but the customer service at Garden Machinery Direct is excellent and they answered all our questions. Thank you.

  11. Kate

    Great Product, lighter than our old one. Collects grass well

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