Why buy the Cobra RM433SPBI 17″ Petrol Rear Roller Lawnmower?
- Powered by a reliable 150cc Briggs & Stratton 575IS InStart engine
- Effortless push-button starting with advanced Lithium-ion battery technology
- Self-propelled drive with a versatile 3-speed gearbox for optimal control
- Full-width rear roller creates a classic, professional striped finish
- 43cm (17″) cutting width and 6 cutting heights (17-75mm)
- Efficient collection with a high-lift blade and 50-litre grass bag
Award-Winning Performance with Push-Button Start
The Cobra RM433SPBI is a premium petrol lawnmower designed for homeowners who demand both convenience and a high-quality finish. Recognised with a Gardener’s World award, this model stands out with its innovative Briggs & Stratton 575IS Series engine. This 150cc powerhouse features InStart® technology, replacing the traditional recoil pull-cord with a simple, reliable push-button start powered by a Lithium-ion battery. A single full charge provides over 50 starts, and the battery recharges quickly, ensuring the mower is always ready for work.
Versatile Control with 3-Speed Drive
Tackling different lawn conditions is effortless thanks to the mower’s self-propelled drive system, which features a 3-speed gearbox. The handlebar-mounted controls allow the operator to easily select the ideal pace: a slower speed for navigating complex areas and borders, or a faster speed for covering long, open stretches of lawn more quickly. This adaptability ensures a comfortable and efficient mowing experience every time.
A Classic Striped Finish with Superior Collection
At the heart of the RM433SPBI’s cutting performance is its durable 43cm (17″) steel deck and full-width rear roller. The roller not only creates beautiful, sharp stripes but also provides stability, allowing for precise mowing right up to the edge of flowerbeds. A single lever adjusts the cutting height through 6 stages, from a low 17mm to 75mm for longer grass. Cobra’s ‘high lift’ blade design creates powerful airflow, lifting grass for a cleaner cut and packing clippings more effectively into the generous 50-litre fabric grass bag. A handy grass bag full indicator prevents overfilling and blockages.
As an established, authorised UK dealer for Cobra, Sims Garden Machinery offers more than just a machine in a box. With over 100 years of experience, our trained sales staff are available to offer expert advice at our Stratford-upon-Avon showroom. For local customers, this lawnmower includes a free Pre-Delivery Inspection (PDI) by our trained mechanics, ensuring it is built, fuelled, and tested before it leaves us. We also offer complimentary local delivery and a full handover demonstration, so you can be confident in operating your new mower from day one. This level of aftersales support is central to the service we provide.
Our team is here to help. Contact us today for expert advice.
Technical Specification
| Engine | Briggs & Stratton 575IS InStart |
| Displacement | 150cc |
| Power Type | Petrol |
| Drive | Self Propelled, 3 Speed |
| Forward Speed | Speed 1: 3.1km/h, Speed 2: 3.7km/h, Speed 3: 4.2km/h |
| Starting Method | Push-Button InStart |
| Cutting Width | 43cm / 17″ |
| Cutting Height | 17mm – 75mm (6 Stages) |
| Height Adjustment | Single Lever |
| Deck Material | Steel |
| Rear Roller | Yes |
| Collection System | Direct Collection |
| Grass Bag Capacity | 50 Litres |
| Grass Bag Full Indicator | Yes |
| Handles | Folding with Cam Lock |
| Weight | 32kg |
| Domestic Warranty | 2 Years |
Why buy from Sims Garden Machinery?
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 support
No call centres. No ticket systems. Just a knowledgeable local team you can speak to when you need help.
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.
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
Who is the Cobra RM433SPBI lawnmower suitable for?
This lawnmower is ideal for homeowners with small to medium-sized lawns (up to around 600m²) who desire a classic, striped finish. Its push-button start makes it perfect for those who dislike or struggle with traditional pull-cord engines, and the self-propelled, 3-speed drive is excellent for lawns with gentle slopes or for users who prefer not to push a mower.
How does the Briggs & Stratton InStart engine work?
The InStart system uses a removable, rechargeable Lithium-ion battery that clips onto the engine. Instead of pulling a recoil cord, you simply press a button. The battery powers a small motor that turns the engine over to start it instantly and reliably. A full charge provides over 50 starts, and the battery can be fully recharged in about an hour.
What are the benefits of a 3-speed gearbox on a lawnmower?
A 3-speed gearbox gives you greater control over your mowing pace. You can select a slower speed for careful manoeuvring around obstacles like flowerbeds, trees, and garden furniture. A medium speed is great for general mowing, while the highest speed allows you to cover long, straight sections of your lawn more quickly and efficiently.
Does the rear roller allow me to mow right to the edge of the lawn?
Yes, the full-width rear roller provides stability and allows the mower to run right along the edge of a lawn or border without the wheels dropping off the side. This results in a much neater, more defined edge and reduces the need for extensive trimming afterwards.
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