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“Cobra MM51B 51cm Petrol Mulching Lawn Mower (Hand Propelled)” has been added to your cart.

Cobra MM51B 51cm Petrol Mulching Lawn Mower (Hand Propelled)


£329.95
(£274.96 ex VAT)
  • 140cc Briggs & Stratton 500E OHV series engine with recoil start
  • Drive Type: Hand propelled
  • Cutting Width: 51cm / 20 inch
  • Cutting Height: 30 - 75mm (5 stage adjustment)
  • High quality steel deck, rotary blade
  • Side discharge option
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Hand propelled, B&S 500E Series 140cc Engine, 51cm Steel Deck, 5 height options, mulching mower

Every Cobra lawnmower has been expertly designed in the U.K to cater specifically for the changing conditions of the British lawn.

With exceptional performance and style, the Cobra MM51B 20" petrol mulching mower is powered by a Briggs & Stratton 500E Series engine and is hand propelled for complete user freedom.

The Briggs Stratton 500 Series engine provides the best-in-class performance in this category of engines. It incorporates the latest engine technologies ensuring optimal torque and efficiency, resulting in lower emissions. The 500 Series powers Cobra mowers for gardens up to 600 square meters.

With a cutting width of 51cm / 20", the Cobra MM51B lawnmower also has 5 adjustable cutting heights ranging from 30mm for a superb low finish, up to 75mm for tackling longer grass. All this is achieved by simply using the single height of cut adjustment lever. Depending on the height of your grass, you can easily and efficiently adjust the cutting height to suit.

Featuring a robust, high quality steel deck & rotary cutting blade, the MM51B lawnmower from Cobra is a mulching mower which enables you to mulch your grass clippings back into the lawn. Mulching lawnmowers recycle the grass by finely cutting and re-cutting the clippings. As the clippings decompose, nutrients and fertilisers are returned to the soil meaning you can cut the grass and fertilise at the same time.

If you don't want to mulch your grass cuttings or your lawn has become overgrown, the MM51B comes equipped with a side discharge function. Simply lift the side blanking plate and insert the side discharge chute. The grass will now be discharged in neat lines to the side of where you are mowing.

The Cobra MM51B also features a folding handlebar making it easy to put away after use, saving precious space & ensuring safe, compact storage.

This Cobra machine is shipped without oil in the machine. Within the packaging there will be a sealed bottle of oil that must be decanted into your unit before the machine is started. Further information can be found in the operators manual. Please read this before starting. Failure to fill your machine with oil will result in a catastrophic failure that will not be covered under warranty.

New E10 Fuel & your Cobra

As you may be aware the current grade of petrol has recently changed in the UK to E10. E10 has been used in mainland Europe for some time & there have not been any major problems reported with its use in lawn mowers & garden tools.

We would however recommend the following to prolong the life of your Cobra:

  • At the end of the season, or if you're not going to use your Cobra for a long period of time, drain or run the fuel tank dry
  • If you're using E10 use Briggs & Stratton Fuel Fit additive
  • You can always opt for Premium Unleaded fuel

Pack Size Each Motor size 140cc Briggs & Stratton 500E OHV series
Weight (kg) 24.5 Colour Red & Black
Working Width 51cm / 20 inch Warranty 2 Year
Model COMM51B Model Number COMM51B
EAN 5055485037763 ASIN B086WNN9BY

Cobra 2 Year WarrantyThis quality Cobra product carries a full two year domestic use warranty. This covers the machine for faulty or defective parts during the two year period. Please note this does not cover wear & tear and consumable parts such as blades, bags and wheels.

Using the machine for commercial / industrial use will result in the warranty being invalidated.

How the warranty works: If you have a problem with the machine during your warranty period, please report the issue to Cleanstore through your account and our customer service team will contact you directly.

  • Cobra MM51B 20" B&S Petrol Mulching Lawn Mower (Hand Propelled)
  • Rotary Cutting Blade
  • Side Discharge Chute

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