Running year after a year through high grass and coarse weeds, hitting against the rocks, dirt mounds, doggy bones, and similar obstacles certainly take its toll on the mower's well-being. In addition to this beating, a lot of owners skip maintenance actions and improperly store their machines leaving them at the mercy of rain, humidity, or heat.
Here's something you DON'T want to hear:
Lawn Mower Sputtering is mostly just the indicator of improper maintenance and can be easily avoided by following the instructions and performing regular checks.
To run smoothly, the engine needs:
- Fresh fuel
- A flow of clean air
- And the ignition spark.
So, if your lawn mower sputters, the culprit can usually be found within these three processes.
Sputtering Lawn Mower? Check These 3 Things
If you let your guard down and allow dirt or bad fluids into the system, your engine will not only sputter but in time it may fail to even start or eventually die completely.
At that point, you'll have to turn to experts, or pony up the cash for the new engine.
1.) Check the Fuel System
This is good news since it's also the easiest issue to solve.
Try to remember when the last time was you filled the gas tank. If it was more than thirty days ago or even at the end of the previous mowing season, then the old gas is the probable suspect for your troubles. Here's Why:
- Organic components within gasoline can quickly evaporate, making the old gasoline burn faster and rendering it useless. Your mower's engine probably has only one cylinder making it more sensitive to these issues than the ones found in cars with four or six cylinders.
- The speed at which gas goes stale has a lot to do with the ethanol percentage it contains.
Always look to buy gas with less than 10 percent of ethanol, or, in the best case, completely ethanol-free.
- Ethanol burns so hot that it can even damage some of the plastic parts. It also helps create water residue within the reservoir and that is definitely not good for the engine.
- Water in the tanks can also come from condensation, or faulty and loose gas cap, especially if the lawn mower isn't properly stored and protected from rain and humidity. If the water enters the cylinder it hinders its functioning.
- If you determine that you have faulty gasoline in your tank, drain it and dispose of it responsibly.
- Before you pour in the fresh batch of gas, shake your tank a little. Sometimes, an outside object can make its way to the tank and restrict the fuel flow by clogging the exit hose.
If the engine experiences gas flow stoppages, it will struggle and sputter. Another issue that can influence the proper gas flow is clogged fuel filter. Remember to check it and replace it if needed.
Besides the one on the tank exit, the fuel system contains at least one more filter and a network of hoses and openings.
If any of them is clogged, the supply of fuel for combustion will not function in a way needed for the engine to run steadily.
So,make sure to also check the lines connecting tank, carburetor, and cylinder, as well as the fuel pump which is usually mounted on the carburetor. If they are dirty, try to clean them or, if that doesn't work, replace them.
2.) Inspect the Ignition
Here's What You Should Do:
By the way, you can get Lawn Mower Spark Plugs and just about anything else you need on Amazon.com!
3.) Adjust or Clean the Carburetor
Once it receives the supplies of air and fuel from other components, the carburetor's job is to mix them properly to make the engine run. If the mixture is a bit off, the engine will sputter and struggle to maintain operating efficiency. Eventually, it may even die.
Although the carburetor usually performed poorly because it's clogged and dirty, it is possible that it just needs some adjustments:
- Adjusting the idle and low-speed setting on a carburetor is fairly simple. Each setting is controlled by a dedicated screw, usually clearly marked.
- Opening these screws just a tiny bit increases the fuel flow to the carburetor and helps the engine run smoothly at these speeds (or at idle).
Bear in mind, if the carburetor is dirty, this is just a quick and temporary fix.
The body of a carburetor contains jets, springs, floats, and needle valves, all of which are extremely minuscule and sensitive.
Sticky by-products of the combustion and fuel residue can create gunky buildup over these components preventing them from performing their function to the fullest.
If one of these gunky deposits breaks off, it can float through the system, clogging it and causing the whole engine to sputter. The sensitivity of carburetor parts is the reason why the tinkering with the carburetor is usually best left to the professionals.
Still, there's some cleaning you can try on your own to see if you can make your lawn mower stop sputtering.
Carburetor cleaner sprays can be bought at any better-equipped store and you can use it for regular preventive maintenance.
Spraying it directly into the intake helps dissolve the deposits and frees up the flow inside the carburetor.
Here's a GREAT Video explaining how to clean it yourself, in just a few minutes:
What to Do if the Lawn Mower is Still Sputtering?
If none of the above methods work, consider your mowing practices. Letting your grass grow too high before mowing or cutting it while still wet can also burden the engine and cause it to stutter.
See how your mower works when faced with less challenging assignments. And if the problem persists, then there's no other option than taking your machine to a mechanic. If the engine sputter is still present after you've performed all of the steps on our list, then probably have a serious engine issue on your hands.
Whether you try to take care of it yourself or leave it to a professional, the most important thing is to react as soon as you notice your engine sputtering. Continuing to work your lawn mower in that condition can lead to irreversible damage and leave you with no other option other than buying a new one.