If your mower is an older model, it may be using a 40 to 1 fuel mix , but many newer models use a 50 to 1 oil mix. You can also get an entire repair kit if this happens very often.
You might also want to check if there is a need to replace components like gaskets, springs and needles in the carburetor.
If you suspect that the spark plug is the problem, you need to confirm it first. You can use an ignition tester for this job or conduct a test visually. So, if they are not clean, your mower might start and die right away.
That is if it starts at all. It is also possible because of a weak electrode. Spark plugs are placed in front of the mower and are wrapped inside a black cable. Remove it manually with a socket wrench and check them for the carbon coating. Use a wire brush to clean the residue.
Never use a shot-blasting cleaner. But if it looks beyond repair, consider replacing the plug. Check for the size and get a new one. These are pretty cheap. In any case, you must replace spark plugs every one or two years as part of your regular mower maintenance. Use a feeler gauge to measure the space between the two electrodes. Note down the specifications of your model and get the replacement.
When you place the new plug, the feeler gauge is expected to drag a little. Just make sure it is not overly tight and you should be fine. It is not unheard of for a lawnmower to act up because of a clogged carburetor. Here are a few telltale signs. But there is more than one way to fix a blocked carburetor. If it is beyond repair, you must consider replacing the whole unit. Below you'll find several necessary troubleshooting steps that may fix over most common types of issues in the engine.
You need access to a few essential tools such as a screwdriver and spare parts if required. A faulty carburetor is the most common reason for a gas engine to start then stall. The primary function of a carburetor is to mix air and gas in the right proportion. The air mix fuel then passes through the compression chamber, where the steady flow of gasoline burns under high pressure and moves the crankshaft to keep the engine running.
Sometimes the contaminated fuel or dirt gets inside, and the carburetor fuel bowl gets clogged. It causes the contaminated fuel to pass through the compressor where fuel doesn't burn properly and the engine stalls. Needless to say, the clogged and dirty carburetor doesn't supply the proper gas flow to the engine that stalls it.
There are several different products available in the market to clean dirty or clogged carburetor fuel bowl. It removes dirt and residue that affect the performance of the carburetor. The high-pressure nozzle allows deep cleaning and removes residue from the carburetor bowl for the smooth flow of gas.
It's easy to use, and you can use it at any angle or even upside down. You can also buy the nylon cleaning brush that I find super useful in cleaning the carburetor. It allows you to clean small openings and hard-to-reach places. Depending on your lawnmower model, you can unscrew the carburetor float bowl's bottom part and clean it thoroughly.
Keep screws at the clean spot, so it doesn't get dirty; otherwise, it will be hard to screw it back on. For proper cleaning, it's best to open the metal flap of the carburetor and give it a thorough cleaning. But if you don't want to open the carburetor, I recommend using Berryman Chemtool Carburetor cleaner. It's a solvent that you add in the fuel, which quickly disperses moisture and other residues from the carburetor. This is the easiest and quick way to clean your carburetor without needing to open it.
The Berryman Chemtool should only be used in gasoline engines. If you need a cleaner for gas and diesel engine lawnmower, you can choose Seam Foam SF You can use an aerosol spray cleaner to clean it from outside and the fuel pipes without opening the carburetor. The high-pressure aerosol can help remove leaked engine oil and dirt outside the carburetor. You can wipe it with a clean cloth and remove any dirt or grease from the engine. You will be very limited in cleaning this way as you will have to open it to clean it from inside.
You need to spray the carb cleaner to the intake valve of the carburetor. Before you start spraying, make sure you're in a clean area and there is no dust flying around. You don't want the dirt or dust to get inside the exposed intake valve. You have to start the engine before spraying and spray two or three times the carb cleaner while the engine runs. Don't rush it too much as it will stall the engine. You will see the engine slowing when you spray the carb cleaner.
Wait for a few moments, and then respray a couple of times. The spark plug ignites the fuel mixture in the engine chamber. A dirty or worn out spark plug generates intermittent sparks that cause the lawnmower engine to either not start or die quickly. You can use a wire brush and cleaning solvent to remove the carbon deposits or dirt. Most often, the carbon buildup on the tip makes it difficult to get a proper spark inside the ignition chamber.
You can remove the spark plug and clean any carbon deposits or oil residues from the tip of the spark plug wire. Also, check for any worn-out signs or cracks. You can remove the spark plug from the lawnmower and attach it to the inlet and try to crank the engine.
You should be able to see a tiny spark from the tip near the bent electrode and bottom pin. If you don't see the flash, it means you need to replace the it. A bad spark plus reduces engine fuel efficiency. You will find that your lawnmower needs more fill-ups to do the job.
This is because of a missing spark flash when the fuel is injected, and the unburned fuel produces white smoke. Another sign of a bad spark plug is trouble in the engine start. Even if you can turn on the machine, the mower quickly dies whenever you throttle the engine.
This is because the worn-out spark plug has difficulty creating sufficient sparks to keep the engine running at a higher speed. Spark plugs in a lawn mower last 12 to 24 months. Engine manufacturers have their replacement and maintenance schedules. You can refer to your lawn mower manual for more information. You don't need to replace the spark plug socket if you don't have any problem starting your mower. You can check and clean it at the start of the season to ensure everything is clean inside and no dirt or residue present.
A clogged or dirty air filter obstructs the airflow to mix with the fuel. Poor airflow causes the lawnmower engine to die in a few minutes after the start. Since the mower often catches dirt and debris from the yard, the filter quickly gets clogged that needs to be cleaned.
Air filters are made of sturdy porous material that can be cleaned with compressed air. If it's too dirty, you can remove it and wash it in lukewarm water with dish soap. These bowls are supported by a screw that goes into a hole underneath the carburetor. This hole might get clogged up, which will keep the gas from moving freely to and from the bowl. To clean the bowl, you need to remove it using an appropriate plug wrench and then clean the bowl and the hole for the screw.
You can use carb cleaner for the bowl and screw, and a thin wire for the hole. These holes are responsible for maintaining the air pressure so that gas can move freely into the carburetor. You can try cleaning these holes with a thin wire. If you see that the cap is worn out or falling apart, then replace it and get a new one. Whether you live in a temperate region where your mower is needed year-around, or in northern areas where it has to sit for the entire winter, the carburetor will always need a little kindness and attention.
Make sure to look at the manual and tutorial videos for assistance. A choke is just a metal flap which prevents air from entering the carburetor.
This helps a cold engine warm-up by creating a richer fuel mix. When the engine has warmed up, the choke is turned off which opens the flap again. It will cause the engine to stall. It also depends whether your engine has a manual flap, automatic flap or no choke and a primer bulb instead. Now that you know about all the common causes and their solutions, you might be asking yourself — What can I do to prevent it? Note: If after your Lawnmower does not work after all of these steps, you might need to buy a new lawnmower.
You can check out some of the best push lawnmowers and riding lawnmowers on our website. Or better yet,. Fixing a mower that at least starts is not as hard as it may seem. Over time, grease and dirt cause them to clog, which curtails the power supplied to keep the mower running.
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