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Cobra RM433SPBI petrol lawn mower - BBC Gardeners' World

Cobra RM433SPBI petrol mower review

A light, easy to use mower for small to medium lawns.

Our rating 
4.8 out of 5 star rating 4.8

In a nutshell

With an easy push button start, three speeds and a rear roller, this was awarded a BBC Gardeners' World magazine Best Buy award. It's easy to use and comes with a two year warranty.
Ease of Handling
5.0 out of 5 rating 5.0
Cutting Performance
4.0 out of 5 rating 4.0
Setting up / Storage
5.0 out of 5 rating 5.0
Value for money
5.0 out of 5 rating 5.0
Pros: Push-button start

Battery charges separately

Light and easy to handle

Simple to adjust cutting height

Rear roller for stripes

Variable speed
Cons: Comparatively small collection bag
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What are the main features of the Cobra RM433 SPBI petrol mower?

This cut and collect petrol mower has a cutting width of 43cm and six heights of cut, ranging from 17 – 75mm, which are easily adjusted with a simple, single lever. It has a push button start powered by a lithium ion battery, which will power over 50 starts on a full charge and it has a charge level indicator so you know when it’s running low and needs charging. the battery also acts as a good safety feature – remove the battery when the mower’s not in use and it will stop children, or anyone else, accidentally starting the mower. The Cobra is self propelled and has three speeds to choose from depending on where you’re mowing. A plastic rear roller creates a good stripe and it comes with a 50 litre collection bag with an indicator flap so you know when it’s full and ready to empty into the compost heap.

What is the Cobra RM433 SPBI petrol mower like to use?

The push button start on this mower is very welcome and means the end of struggling with a pull cord to get things moving. It has three speeds and the top speed is fast, which helps you mow larger areas quickly. The mower feels light and nice to handle and the lowest speed helps you manoeuvre around detailed areas like borders, paths and trees with ease. The plastic roller also adds weight and stability to the mower helping you get right over the edge of borders for a neat cut. It’s also easy to use and adjust the speed as well as the height of cut. Only the collection bag feels a bit small, especially compared to the other mowers in the test.

Is the Cobra RM433 SPBI petrol mower easy to store?

Light and easy to manoeuvre in an out of the shed this mower also has quick release levers on the handle so it’s fast and simple to fold them down for storage. The fabric grass collection bag can also be removed and packed flat on top of the deck to take up less room.

Is the Cobra RM433 SPBI petrol mower good value for money?

This is a simple, quality mower with three speeds and a rear roller and it’s easy and light to use. It comes with a two-year warranty and is one of the cheapest petrol mowers in our test. We think it’s excellent value for money.


For more reviews, read our round-up of the best electric lawn mowers.

Product Specifications


Name Cobra RM433SPBI petrol mower
Model RM433SPBI
Price £520.00
Lawn mower type Petrol


Powered by Petrol
Engine capacity 150cm³
Cutting height 17-75mm
Number of cutting height settings 6
Cutting width 43cm
Collection capacity 50l
Roller Yes
Propelled Yes
Noise 96dB
Weight 32kg
Warranty 2YEAR