Whether you are a professional or amateur gardener, you can always encounter problems with your lawnmower. So, what should you do if your lawnmower splutters to a stop or worse still, won’t start at all? Before you give us a call or rush to buy lawnmower parts from our online shop, check out our simple guide to the common reasons that may cause your lawnmower to not start.


One of the most common reasons that may cause your lawnmower to not start is a lack of fuel. To ensure you don’t make unnecessary trips to our workshop, make sure you regularly check your fuel levels. If your lawnmower has plenty of fuel, some models are fitted with a fuel switch which allows the fuel supply to the engine to be turned on and off. Make sure this switch is on because if it is not, your lawnmower will not start.

Pull Cord

If you are struggling to pull the starting cord, or it has given you a painful jolt, it may be because the lawnmower has gotten itself clogged up with grass, twigs or other debris. Move the lawnmower away from the area you are cutting to an area of hard standing or an area of clear of grass and give the pull cord a gentle tug. This should remove any blockages. If you are still experiencing problems, then carefully check the blades and grass outlet. Ensure that engine is completely off and disconnect the spark plug if possible, before accessing the blade area or any moving parts of your lawnmower.


The carburettor is another of the most common reasons that your lawnmower won’t start. Internal corrosion in the carburettor can be caused by fuel that has passed its sell-by date. This means that fuel has been sat in the tank or carburettor for a few weeks. Fuel only has a shelf life of about a month before it breaks down and the ethanol content causes corrosion, which can clog up the carburettor.

In addition to this impurities and debris, including that caused by older fuel left in the machine, can contribute to fuel filter blockages. Generally, if this is the problem, you’ll need to completely replace the fuel filter.

The air filter is also another common source of carburettor related issues. If your air filter is blocked, this will mean that the engine is getting insufficient air and will most likely cause regular stalling. The easiest fix is to simply replace the air filter, which are available from our parts department.

Spark Plugs

Dirty, faulty or damaged spark plugs can affect your lawnmower at the best of times but will most likely prove to be more of a problem as time passes or at the beginning of the season if you have not kept up with a regular maintenance schedule. The easiest way to solve this problem is to purchase a new spark plug, which are available from our parts department.


Cutting long, very wet or tough grass can cause your lawnmower to start pouting, spluttering and stalling. If you’re facing long grass, you will need to raise the cutting height of the lawnmower to the highest setting possible. If this still doesn’t work, your best option is to use a brushcutter or strimmer. This will allow you to reduce the height of the grass to a more manageable height before using your lawnmower to cut the grass to your desired height.


Lawnmowers are generally easy to repair and maintain and parts are readily available. However, before starting work on your machine always refer to the manufacturer’s instructions, ensure that the machine is not in operation and never access the blades when it is.

If you are fed up having to solve problems with your petrol lawnmower, why not look at our range of electric, battery, robotic or even ride on lawnmowers which can make lawn maintenance much easier and enjoyable.