Allett Kensington 20 Petrol Cylinder Mower (Honda or Briggs Engine)
Designed for keen home gardeners with medium to large lawns, the Kensington Petrol Garden Mower is the ultimate cartridge machine in the Allett Homeowner Range. It is one of our most popular cylinder mowers and takes all the cartridges in the Allett range allowing for a range of lawn-care tasks using just one machine.
The Kensington 20 has a number of special features giving it an unbeatable cutting performance. The spring tine comb attached to the Kensington lifts the grass prior to cutting to ensure an even cut, and a zinc plated steel front roller and heavy steel rear roller help produce those beautiful, classic stripes that are the hallmark of an Allett lawn.
Equipped with a six-bladed precision cutting cylinder delivering 79 cuts per metre, the Allett Kensington 20 has a 20”(51cm) cut and can be supplied with either a 127cc XR550 Briggs + Stratton or 122cc GX120 Honda petrol engine. It also features an infinitely variable micro cutting height adjustment from ¼ to 1 ¼ inch (6mm-32mm).
For enhanced lawn care, a range of optional additional cartridges can be fitted in place of the standard cutting unit. These include; the 10 bladed cutting cylinder, Aerator, Lawn Brush, Dethatcher, Scarifier and a Verticut cartridge.
Height of Cut - 6mm-32mm. Variable micro-set adjuster
S=6mm
1=13mm
2=19mm
3=26mm
4=32mm
1 click= 0.75mm
Cutting System
- Cylinder cutting system
- 51cm / 20” / 508mm cutting width
- Six-blade (Quick Cartridge) cylinder
- 79 cuts per metre
- Height of cut: 6mm–32mm (¼“ to 1 ¼”)
- Micro-set adjuster – incremental height of cut
Cartridge Compatibility
- Takes ALL the cartridges in the Allett range
- Listed: 10-blade cylinder, scarifier, aerator, lawn brush, dethatcher, verticutter
Engine & Power
- 127cc XR550 Briggs & Stratton / 122cc GX120 Honda petrol engine – Recoil start
- 2-litre fuel tank
Weight & Dimensions
- Overall width 68cm (27”)
- Weight: 56.6 kg with grassbox (Kensington 20B)
Grass Management
- Fixed grass rake – adjustable
- 70-litre grassbox
Rollers & Stripe Quality
- Zinc-plated steel front roller
- Double-section steel rear roller with differential – no wheel marks
User Comfort & Storage
- 3 handlebar height positions plus folding for storage/transport
Extras
- Suitable for lawns up to 900m²
- 2 years (24 months) for homeowner use or 3 months for Sports Pro setting
Double Section Rear Roller
The Allett Kensington 20 features a robust double-section steel rear roller with differential, enabling smooth, effortless turns without damaging turf. This design enhances durability, traction, and control while producing sharp, professional stripes and a flawless lawn finish.
Interchangeable Cartridges
The Allett Kensington 20 works with six interchangeable lawn care cartridges, letting you quickly switch from mowing to tasks like scarifying, aerating, dethatching, or brushing. This flexibility transforms it into a full lawn care system, offering far more than a mower alone.
Height of cut 6-32mm
The Allett Kensington 20 includes a micrometric height-of-cut adjuster, offering a precise range between 6mm and 32mm. This fine-tuned control allows you to tailor the mowing height to suit lawn conditions, ensuring accuracy and delivering a consistently clean, professional finish.
Fitted Grass Rake
The Allett Kensington 20 is fitted with a spring tine grass rake positioned in front of the cutting cylinder. This feature lifts lateral grasses and clears debris before the blades cut, improving precision and encouraging a healthier, more upright lawn with a superior finish.
User-Friendly Design
Equipped with a self-propelled drive, the Allett Kensington 20 reduces effort for the operator, while folding handlebars and three adjustable handle height positions ensure comfort and convenience. A large 70L grassbox adds efficiency, making operation and storage simple.
Precision Cutting
The Kensington 20 comes equipped with a 6-blade Quick Cartridge™ cylinder, engineered for high-quality, clean cuts that promote a healthier lawn. With 79 cuts per metre, the mower delivers a scissor-like cut that avoids tearing or bruising the grass — ideal for formal lawns where finish quality matters.
Compatible with:
Allett Kensington Range
Take a closer look at the Kensington 20 in action as we demonstrate its key features, including the 6-bladed cutting cylinder, adjustable height settings, and Quick Cartridge System. See how this petrol-powered mower delivers a precise, striped finish—perfect for creating a professional-looking lawn at home.
Watch nowHOW THEY COMPARE
Our comparison table provides a detailed breakdown of the Kensington 14B, 17 & 20 models. Allowing you to easily compare their technical specifications side by side. From cutting widths and engine power to weight and height adjustments, this table helps you find the perfect mower for your needs.
Expert Petrol
Expert Petrol
Expert Petrol
Small-Medium sized gardens up to 400m2
Small-Medium sized gardens up to 700m2
Small-Medium sized gardens up to 900m2
35cm (14")
43cm (17")
51cm (20")
Six-blade 'Quick Cartridge' cylinder
Six-blade 'Quick Cartridge' cylinder
Six-blade 'Quick Cartridge' cylinder
Aerator, Lawn Brush, Dethatcher, Scarifier, Verticutter and 10 bladed cylinder
Aerator, Lawn Brush, Dethatcher, Scarifier, Verticutter and 10 bladed cylinder
Aerator, Lawn Brush, Dethatcher, Scarifier, Verticutter and 10 bladed cylinder
Briggs and Stratton 127cc XR550 petrol engine (2L fuel tank)
Briggs and Stratton 127cc XR550 petrol engine OR Honda (2L fuel tank)
Briggs and Stratton 127cc XR550 petrol engine OR Honda (2L fuel tank)
Engine power engaged via handle bale-bar to rear roller
Engine power engaged via handle bale-bar to rear roller
Engine power engaged via handle bale-bar to rear roller
Recoil start
Recoil start
Recoil start
Standard six-blade 79 (73)
Optional 10- blade cartridge 131 (119)
Standard six-blade 79 (73)
Optional 10- blade cartridge 131 (119)
Standard six-blade 79 (73)
Optional 10- blade cartridge 131 (119)
Variable micro-set adjuster with 1-4 Pre-Set heights plus S (Scarifying)
Variable micro-set adjuster with 1-4 Pre-Set heights plus S (Scarifying)
variable micro-set adjuster with 1-4 Pre-Set heights plus S (Scarifying)
6-32mm (¼-1¼") height-of-cut
S=6.5mm
1=13mm
2=19mm
3=26mm
4=32mm
1 click= 0.75mm
6-32mm (¼-1¼") height-of-cut
S=6.5mm
1=13mm
2=19mm
3=26mm
4=32mm
1 click= 0.75mm
6-32mm (¼-1¼") height-of-cut
S=6.5mm
1=13mm
2=19mm
3=26mm
4=32mm
1 click= 0.75mm
Three height positions plus folding
Three height positions plus folding
Three height positions plus folding
Twin split bale bar for cylinder and/or roller drive
Twin split bale bar for cylinder and/or roller drive
Twin split bale bar for cylinder and/or roller drive
Steel rear roller
Split twin section steel roller with geared differential
Split twin section roller with geared differential
Zinc Plated Steel front roller with bearings
Zinc Plated Steel front roller with bearings
Zinc Plated Steel front roller with bearings
Grass rake behind front roller to stand grass upright before mowing. Depth adjustable.
Grass rake behind front roller to stand grass upright before mowing. Depth adjustable.
Grass rake behind front roller to stand grass upright before mowing. Depth adjustable.
Polypropylene impact resistant grassbox (52L)
Polypropylene impact resistant grassbox (62L)
Polypropylene impact resistant grassbox (70L)
51cm (20")
60cm (23")
68cm (27")
47.5kg (with grassbox)
53.5kg (with grassbox)
56.6kg (with grassbox)
Operator noise level 96dB(A)
Operator noise level 96dB(A)
Operator noise level 96dB(A)
Two years (24 months) parts and labour warranty for homeowner mowers (Lawn sizes up to 400m2)
3 months warranty for Sports Pro Use.
Two years (24 months) parts and labour warranty for homeowner mowers (Lawn sizes up to 700m2)
3 months warranty for Sports Pro Use.
Two years (24 months) parts and labour warranty for homeowner mowers (Lawn sizes up to 900m2)
3 months warranty for Sports Pro Use.
Kensington in Action
Explore the power, precision, and performance of the Kensington 20 through our curated video playlist. Watch in-depth demos, detailed unboxings, and insightful comparisons to see how the Kensington 20 stacks up against other mowers. Whether you're a lawn care enthusiast or a first-time buyer, these videos will give you a closer look at what makes the Kensington a standout choice for achieving a professional-quality finish at home.
FAQ
In our FAQs for the Allett Kensington, you'll find answers to common questions about the mower's features, maintenance, and performance. We’ve gathered insights on everything from how to adjust cutting heights and maintain the mower, to recommendations for the best usage on different types of turf.
What engines are available for the Kensington 20 Petrol Cylinder Mower?
The Kensington 20 is available with two engine options: a 127cc XR550 Briggs & Stratton petrol engine and a 122cc GX120 Honda petrol engine.
Can the Kensington 20 be used for lawns of all sizes?
The Kensington 20 is designed for lawns up to 900m², making it suitable for medium to large gardens.
What optional cartridges are available for the Kensington 20?
The Kensington 20 can be fitted with various optional cartridges, including a 5/6/10-bladed cutting cylinder, aerator, lawn brush, dethatcher, scarifier, and verticut cartridge.
Is the Kensington 20 self-propelled?
Yes, the Kensington 20 is a self-propelled mower, making it easier to use on larger lawns
Does the Kensington 20 leave wheel marks when mowing?
No, the Kensington 20 features a double section steel rear roller with differential that helps produce strong, beautiful stripes without leaving wheel marks.
READY TO MOW?
Allett Kensington Honda Cylinder Lawnmowers Available For UK Sale
We have been manufacturing the Kensington models with the Briggs + Stratton engine on for a few years now in the UK market with the Honda engines also fitted on models abroad. We are now happy to a...