Mowers Guide makes you fixing things easy and helps you to which thing is best to work for you with our user guides, buyers guide, tips and tricks for your lawn or garden healthier. If your lawn mower won’t start, here are the top 6 most probable causes.

1. Defective Spark Plug

Due to carbon buildup and a weakened electrode, the spark plug will degrade over time which can prevent the engine from starting. You should inspect the spark plug for damage or wear, you can also use an ignition tester to help determine. If the spark plug is defective as a general guideline we recommend replacing the spark plug with a new one once a year.

2. Restricted Carbeutartor

The residue that results from old fuel being left in the tank, can create a restriction in the carburetor. This is why you should always use fresh fuel when filling the tank and a fuel stabilizer to help maintain the quality of the fuel. You can try cleaning the carburetor with carburetor cleaner to eliminate the clog. If cleaning is not effective you can often purchase a carburetor repair kit to replace some of the components or install a new carburetor altogether.

3. Clogged Fuel Filter

Old or bad fuel can also create a clog in the fuel filter, which can prevent the engine from starting. We recommend replacing the filter with a new one.

4. Malfunctioning Ignition Coil

The ignition coil sends voltage to the spark plug while the engine is running. If the ignition coil is malfunctioning the engine may not start as with the spark plug you can use an ignition tester to determine. If the ignition coil has failed and will need to be replaced.

5. Broken Flywheel Key

The flywheel key is a small metal piece, which fits into the crankshaft and engages with the flywheel. The engine may suddenly stop if the mower blades hit a hard object and the flywheel key will break in half. To prevent damage to the engine if this happens you will need to replace the broken flywheel key with a new one before the engine can be restarted.

6. Defective Recoil Starter

If the starters recoil spring is broken the rope won’t be able to recoil on to the pulley, resulting in the engine not starting. Many recoil springs can be replaced individually but it may be easier to replace the whole recoil starter assembly.

The information provided in this lawn mower troubleshooting article is fit to all lawn mower brands such as Ariens, Bolens, Craftsman, Cub Cadet, Dixon, Echo, Exmark, Green Machine, Homelite, Honda, Huskee, Husqvarna, John Deere, Lawn-Boy, MasterCut, Montgomery Wards, MTD, Murray, Poulan, Poulan Pro, Ryobi, Simplicity, Toro, Snapper, Troy-Bilt, Turf King, Weed Eater, Wheel Horse, Worx, Yard Machines, Yard-Man.

All of the parts shown in this article are easily available on Amazon and Homedepot website for additional troubleshooting information enter the full model number of your lawn mower or the mower engine in our comment section bar. We will help you why your lawn mower won’t start! 

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