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Cobra MX515SPBI 20″ Petrol Lawnmower

£0.00 inc. VAT

The Cobra MX515SPBI is a premium self-propelled lawnmower for demanding users. Its 20″ aluminium deck, 5-speed gearbox, and Briggs & Stratton InStart engine offer powerful, versatile performance for medium to large lawns.

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Description

Why buy the Cobra MX515SPBI 20″ Petrol Lawnmower?

  • Powerful and reliable 163cc Briggs & Stratton 675IS InStart engine
  • Durable, corrosion-resistant cast aluminium deck
  • Wide 51cm (20″) cutting width for efficient mowing of larger areas
  • 5-speed self-propelled drive for complete control over mowing pace
  • Versatile 3-in-1 functionality: collect, mulch, or side discharge
  • Large 60-litre grass bag with a convenient ‘bag full’ indicator

The Cobra MX515SPBI is a premium 4-wheeled petrol lawnmower designed for both discerning domestic gardeners and professional users who require robust performance and versatility. With its wide 51cm (20″) cutting width, it is ideally suited for maintaining medium to large-sized lawns efficiently.

Briggs & Stratton InStart Engine

At the core of the MX515SPBI is the Briggs & Stratton 675IS InStart engine. This powerful 163cc engine eliminates the need for a traditional recoil pull-start, offering effortless starting at the push of a button. The innovative InStart battery provides over 50 starts from a single full charge and can be quickly recharged from flat, ensuring the mower is always ready for work.

Durable Aluminium Deck & 5-Speed Gearbox

This mower is built to last, featuring a hard-wearing, cast aluminium deck. This premium construction offers superior durability, resistance to corrosion, and is easy to clean, promising a longer working life compared to standard steel decks. The self-propelled drive system is managed by a reliable 5-speed gearbox, giving the operator complete control. The speed can be adjusted from 3km/h to 4.2km/h, allowing for a slower pace in intricate areas and a faster speed for covering large, open spaces with ease.

Versatile 3-in-1 Cutting System

The Cobra MX515SPBI provides ultimate flexibility with its 3-in-1 collection system. For a pristine finish, the large 60-litre fabric grass bag collects clippings efficiently and features a ‘bag full’ indicator to prevent overfilling. For a natural lawn feed, the included mulch plug recycles clippings by cutting them finely and returning them to the soil. For overgrown or informal areas, the side discharge chute quickly disperses clippings without the need for collection, speeding up the mowing process.

Designed for the User

Every feature is designed for convenience and a superior cut. A single lever adjusts the cutting height through 7 stages, from a low 25mm to a high 75mm, making it suitable for various grass conditions. The handles feature a cam lock system, allowing them to be folded quickly for more compact storage or transportation. This combination of power, durability, and user-friendly features makes the Cobra MX515SPBI a standout choice in the walk-behind mower category.

As an authorised UK dealer for Cobra, Sims Garden Machinery has been serving customers for over 100 years. All machinery purchased from us is fully assembled and prepared by our trained mechanics. For local customers, we offer a free pre-delivery inspection (PDI), personal delivery to your door, and a comprehensive handover demonstration from our trained sales staff, ensuring you can use your new mower confidently and safely. You can also view this machine at our Stratford-upon-Avon showroom, where our team is ready to assist.

Not sure which machine or part is right for you?
Our team is here to help. Contact us today for expert advice.

Technical Specification

Engine Briggs & Stratton 675IS InStart
Displacement 163cc
Starting System InStart Push-Button
Drive Self Propelled, 5 Speed
Speed 3km/h – 4.2km/h
Cutting Width 51cm / 20″
Cutting Height 25 – 75mm / 7 Stages
Collection System 3-in-1 (Collect, Mulch, Side Discharge)
Grass Bag Capacity 60L
Grass Bag Full Indicator Yes
Folding Handles Yes, with Cam Lock
Deck Material Aluminium
Wheels 4 Wheeled
Weight 38kg
Domestic Warranty 2 Years

Why buy from Sims Garden Machinery?

Authorised Dealer

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 people, real support

No call centres. No ticket systems. Just a knowledgeable local team you can speak to when you need help.

Expert Advice

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.

Since 1908

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

Frequently Asked Questions

Who is the Cobra MX515SPBI lawnmower best suited for?

The Cobra MX515SPBI is ideal for gardeners with medium to large-sized lawns who need a powerful, reliable, and versatile machine. Its durable aluminium deck makes it suitable for both demanding domestic use and light professional work. The 5-speed gearbox provides excellent control for properties with varied terrain or complex borders.

What is the Briggs & Stratton InStart system?

The InStart system is an innovative lithium-ion battery-powered starting mechanism. It replaces the traditional pull-cord with a simple push-button, making the mower incredibly easy to start. A fully charged battery can provide over 50 starts, and it recharges quickly, offering maximum convenience.

What are the benefits of the 3-in-1 cutting system?

The 3-in-1 system offers great flexibility. Collection provides the cleanest finish by gathering all clippings in the 60L bag. Mulching finely shreds the clippings and returns them to the lawn as a natural fertiliser. Side Discharge is perfect for longer grass or when you need to mow quickly without stopping to empty a bag.

Is the aluminium deck a significant advantage?

Yes, a cast aluminium deck is a premium feature. It is significantly more durable than a standard steel deck, is highly resistant to rust and corrosion, and doesn’t distort over time. This ensures a longer lifespan for the mower and helps maintain consistent cutting performance.

User Manuals / Downloads


View Cobra Brochure

Additional information
Weight38 kg
Brand
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.51 cm
Deck MaterialThe material the cutter deck is constructed from (e.g., Steel, Aluminium).Aluminium
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”,”Side-Discharge”]
Rear RollerIndicates if the mower features a rear roller for creating lawn stripes.FALSE
Specification

Specification

Type Petrol
Propulsion Self Propelled
Cutting Width (cm) 51
Blade Type Rotary
Deck Aluminium
Power Type Petrol
Engine/Motor B&S 675IS InStart
No of Heights of Cut 7
Lowest Height of Cut (mm) 25
Highest Height of Cut (mm) 75
Grass Bag Capacity (ltr) 60
Handle Folding Yes
Max Domestic Warranty (yrs) 2
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Shipping & Delivery

FREE PDI, DELIVERY & HANDOVER

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.

NATIONAL DELIVERY

  • Each machine will be tested prior to delivery.
  • Orders will be sent out via either ThePalletNetwork or DHL insured service.
SKU: C3-COBRA MX515SPBI Categories: ,