AL-KO Highline 51.7 SP 4-in-1 Self-Propelled Petrol Lawn Mower
AL-KO Highline 51.7 SP 4-in-1 Self-Propelled Petrol Lawn Mower AL-KO Highline 51.7 SP 4-in-1 Self-Propelled Petrol Lawn Mower
RRP: £529.00
OUR PRICE: £449.00 (inc VAT)
Included Free With This Machine
IN STOCK - DELIVERY TIME: Order before 2.00pm for next day delivery (Monday-Friday)

Free delivery on garden machinery orders over £50.

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Thanks to the 4-in-1 function, the AL-KO Highline 51.7 SP will easily adapt to use in a range of different mowing environments with its collection, mulching and side discharge capabilities.

This German-engineered machine is equipped with a quality 163cc Briggs & Stratton 650 EXi four-stroke engine which delivers impressive performance. ReadyStart enables easy, reliable ignition, and does away with the need to prime the carburetor. The advanced engineering on the engine also eliminates the need for regular oil changes.

The Highline 51.7 SP benefits from self-propulsion which saves the effort of pushing, making it easy to cover slopes. The extra large rear drive wheels enhance manoeuvrabiltiy and traction and are ball-bearing mounted for smooth running and a long service life.

The 51cm (20") MAX AIRFLOW steel cutter deck has an aerodynamic, deep dome design which combines with the large discharge channel resulting in extremely efficient collection into the 70 litre grass collector, with no blockages and less interruptions to empty. The bag full indicator will alert you when the grass catcher is full, which can be quickly and easily removed then reinstalled with help of the AL-KO's EasyClick engagement.

When you have finished the mowing, the AL-KO 51.7 SP Highline petrol rotary lawn mower has an upright storage position for easy access to the mower deck for cleaning and maintenance, which also takes up less room in the shed or garage.

Suitable for medium to large lawns up to 1,800 square metres, this model enjoys the reassurance of an extended five year manufacturer's warranty for domestic use.

Product specification

Brand: AL-KO
Engine: Briggs & Stratton
Engine Model: 650EXi
Engine Type: Petrol, 4-stroke, OHV
Displacement: 163cc
Rated Power Output: 2.4kW / 2,800 rpm
Start Method: Recoil
Throttle Control: No
Propulsion: Self-propelled
Ground Speed: 1-speed 3.5km/h / 2.2mph
Recommended Lawn Area: Up to 1800m²
Cutter Deck: MaxAirflow Highline steel
Cutting System: 4INONE function: mow, collect, mulch and side discharge
Width of Cut: 51cm / 20"
Minimum Cutting Height: 30mm
Maximum Cutting Height: 80mm
Cutting Height Adjustment: Central, 7 stages
Collection System: Direct collection
Grass Collector: EasyClick plastic grass box
Collector Capacity: 70L
Bag Full Indicator: Standard
Mulch Capable: Yes
Mulch Plug: Standard
Side Deflector: Standard
Handle Type: 2 point, foldable
Wheels - Front: 200mm, ball bearing mounted
Wheels - Rear: 280mm, ball bearing mounted
Safety Features: Operator presence control
Shipping Dimensions: L: 108cm x W: 60cm x H: 58cm, 39kg
Weight: 37kg
Warranty: 5 years (domestic use)
Briggs & Stratton engine

Briggs & Stratton 650EXI Engine

The 650EXi SERIES engines combine powerful performance with new levels of easy operation. Easy to use, easy to maintain, easy to start - the EXi SERIES delivers a new engine experience for the most demanding of users. It is the lightest engine in its class, making it easy to use, manoeuvre and store. Easy features are everywhere, including ReadyStart® and simple maintenance features like tool-less filters and air cleaners. 

AL-KO overhead valve  

OHV Technology

The advanced, powerful OHV platform for more performance, less consumption through optimal valve location and design of chamber.

DR powered by Briggs and Stratton

Just Check & Add™

The precision engineering means the Briggs & Stratton EXi SERIES needs no regular oil change - just an occasional top-up.


The mower is equipped with a clutch which, when engaged, propels the mower forward, reducing the amount of effort expended by the operator.


4-IN-ONE Function

A multi-purpose machine, AL-KO's prized 4-in-1 function features mowing, collecting, mulching and side discharge capabilities.

AL-KO Highline MaxAirflow technology


Extra tall, extra large – that's the basis for MaxAirflow technology. This is because the extra tall steel plate deck and extra large discharge channel increase the airflow by 42 per cent. As a result, the grass clippings are not transported at a low level into the grass catcher as in the case of most standard lawnmowers, but are instead thrown backwards in a high arc and remain at the back. This means the grass catcher is effectively filled from the back, without the discharge channel becoming blocked. Another bonus: The removable service flap for convenient mower maintenance.

Full Catcher, Fewer Interruptions

MaxAirflow technology means that the lawn clippings are thrown to the back of the grass catcher, as a result of which it is filled to the top and does not have to be emptied so often.

No Green Fingers

MaxAirflow technology means that it is even possible to mow long, damp grass without leaving clumps behind on the ground or blocking the discharge channel. This means your hands stay cleaner.

AL-KO mower efficient controls

Efficient Controls 

The Highline lawn mower range features efficient controls including a sculpted drive lever to avoid trapping fingers.


AL-KO Service Position

An innovative AL-KO concept, this mower features a unique Service Position which enables the mower to stand on end when the fuel tank is empty.  This allows easy cleaning and maintenance of the underside of the mower deck.

Other Key Features

Large EasyClick grass box with level indicator.

Comfortable, seven stage cutting height is simple to adjust using a single lever.

Extra high drive wheels for added traction and easier turning in long grass.

Ball bearing wheels won't stiffen up over time.

Mulch plug is included.

Main lawn mower body comes fully assembled in the box.


AL-KO petrol lawn mowers are now backed by a five year warranty for domestic use.

Alko lawnmower


Founder Alko Founded in 1931 by Alois Kober as a small metalworking shop in southern Germany, AL-KO has become a global player comprising of more than 50 sites in 30 countries. The AL-KO Group today employs over 4,200 people worldwide covering three business divisions - Vehicle Technology, Garden + Hobby, and Air Technology. All AL-KO employees take great pride in the quality products they manufacture. 

For greater enjoyment in the garden

For more than 50 years, AL-KO has been developing and designing innovative garden tools for an extremely wide range of requirements and applications. Not only do AL-KO tools reflect its many years of expertise in technology and function, they also set new standards in terms of design. 

When the best is expected

With Germany efficiency, AL-KO's research and development engineers create pioneering garden tools from hundreds of individual parts. Materials of the highest quality, ingenious technology, perfect ergonomics and a sure feel for form and deteail make AL-KO's garden tools unmistakable.

The rigourous quality requirement that characterises the AL-KO band is guaranteed through its comprehensive technology programme that is consistently planned and implemented by AL-KO development engineers, designers and technicias - from the first design, to prototype construction and the end product.

Why not take the plunge into the world of AL-KO and get to know its high-quality products - without doubt you will find just the right implement for your requirements. AL-KO has everything you need for the garden, whether you are mowing, trimming, shredding, mulching, scarifying, lawn raking, cultivating, splitting or clearing ... 


All machines come with a two year warranty, following this machines have an extended warranty depending on the range and annual servicing by an authorised AL-KO dealer.

AL-KO Warranty

Solo by AL-KO

AL-KO has recently acquired Sindelfingen-based SOLO Kleinmotoren GmbH to strengthen its range of garden machinery. The existing AL-KO range is being expanded with petrol chainsaws and trimmers, providing customers with expertise and strong, tradition-rich brands in one product range.

 AL-KO factory


Click to view AL-KO Garden Technology brochure

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