Lawn mower not working. 16 Reasons Why Your Electric Lawn Mower Won’t Start
How To Fix A Lawnmower That Will Not Start
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The two basic requirements that allow a lawnmower’s engine to startup are fuel and a spark. If you are experiencing fuel starvations (when fuel is not getting to your engine), or if you are not getting a spark at the plug, your engine will not be able to startup.
Bad compression can also be a reason for experiencing difficulty while trying to start the lawnmower’s engine. If you pack the lawnmower away for the winter with fuel still in the tank, the seals, valves, and pumps in the lawnmower’s carburetor can become blocked up with varnish deposits. Along with this, dirt and dust can get collected and end up blocking the fuel system or clog filters.
Before You Start Troubleshooting On Your Mower You Should:
Proceed with caution when working with your mower. You should first start by removing any sources of ignition. This includes cigarettes, naked flames, sparks, stoves, or other hot objects that are in the same area that you intend on working on the tank or fuel lines.
Be sure to do this if you need to remove any clumps of grass that may be jammed under the deck.
This is to avoid the oils in the mower from spilling, as this is likely to happen if left on its side.
This can be avoided if there is a small amount of gas in the tank, or if you do not think that it will reach the tank cap. However, if you are unsure of this then it would be best to just drain the tank. Another trick is to open the cap and then place a plastic bag over the opening and then put the cap back on.
You are likely to cause premature engine wear if the oil level is low. Added to this, an engine can seize quickly if there is no oil present in the lawnmower.
Checking On The Oil Level Of Your Lawnmower:
Before starting the process of troubleshooting, you should make sure that the oil level in the lawnmower is deemed acceptable. You can do this by:
- Move the lawnmower to a surface that is level.
- Remove the dipstick and wipe it clean.
- Place it back in the lawnmower and then remove it again.
- Check to see where the marking is. If it is relatively low, top it up to the necessary level.
You should make a mental note that the oil in the tank should be changed after every 25 to 50 hours of run time or as advised in your engine manual.
Tips To How To Get Your Lawnmower Started:
How Do You Start A Lawnmower With Old Gas?
Although, it is recommended to drain the lawnmower’s gas tank before it sits for a long period of time without any use. However, most people do not do this. The result of not draining the gas tank causes residue build-up. If this occurs, you should refer to your lawnmower’s manual for information on how to remove this build-up from the fuel tank effectively, as well as for service procedures. Or see our guide on this problem.
As soon as the build-up has been cleaned out, gather all the old gasoline and put it in a container to dispose of it properly. This can be done by running a siphon hose from the gas tank to the container and then pumping the bulb a few times. In doing this, you are moving the gas from the fuel tank and draining it into the container, which thereby cleans out the lawnmower’s fuel tank.
If your lawnmower still is not working after you have cleaned out the fuel tank and adding new gasoline to the mower, you should make sure that your spark plug is working. There is a large possibility that the spark plug wire will become loose after being stored for long periods at a time.
A common problem found when trying to restart a lawnmower that has been stored in that the carburetor gets flooded. Be sure to note the smells and sounds of the lawnmower while you are trying to start it. A strong gasoline smell could mean that the carburetor has been flooded, and as a result, the lawnmower will not start. In this case, you should wait a few minutes before you try to start the mower again.
How Do You Dispose Of Your Lawnmower’s Oil?
When cleaning out the oil in your mower, be sure to collect in a bottle-like container that screws shut. This is to prevent any spilling. Your local mechanic or oil change shop should usually take your used motor oil to dispose of properly. However, if this is not possible, there may be disposal programs for motor oil at your local dump.
If smoke is coming out of your mower, this could be a sign that the oil needs to be checked and changed. However, a lawnmower that will not start obviously will not smoke. Nonetheless, this is a good sign to look out for as it will allow you to stay on top of your lawnmower maintenance. Added to this, smoke coming from a mower could show that there is a leak somewhere. The leak causes the oil to burn when it lands on hot surfaces such as hot metal. Along with this, smoke can also indicate that there is not enough oil in the lawnmower. Not enough oil has the potential to cause permanent damage to the engine of the mower.
What Are The Options For No-Hassle Gas?
One form of no-hassle gas is a product called TruFuel and it is available in most hardware stores. Known to be “old school” gasoline that has no added ethanol. What is so great about this product is that you do not have to add any fuel stabilizers. It runs clean and can sit in storage all winter and will still start up very easily.
However, it is more expensive than regular gas. Nonetheless, when you weigh in that while using no-hassle gas you will not need to pay to replace your lawnmower or carburetor every few years.
So after reading my post on how to start a lawnmower that won’t start and you decide that it’s easier just to buy a new one, then be sure to check out my post on the best mowers that are under 300.
Hi, Alex Kuritz here. Growing up I remember that my family had one of the best lawns in the neighborhood. Richly green and lush. I did a lot as I grew up in terms of caring and tending for not only my family’s lawn but also my neighbors. I can say I have years of experience, and I am here to share it with you.
Reasons Why Your Electric Lawn Mower Won’t Start
Do you have an electric lawn mower that will not start? You are not alone. Most people who own these lawn care machines experience this problem at some point in time, and it is frustrating, to say the least.
Fortunately, there are a handful of common causes for this issue, many of which you can troubleshoot and solve yourself somewhat easily.
An electric mower may not start due to the key not being fully engaged, the plug connections being loose, safety handles are not engaged, or an insufficient power source.
A lawn mower filled with debris, debris restricting the blade rotation, damaged components, and clogged vents can also cause your lawn mower to not start.
Because it is such a common issue for mowers to have trouble starting, we have put together a full list of what you should check the next time it doesn’t start.
Follow all safety instructions provided in your equipment operator’s manual before diagnosing, repairing, or operating. Consult a professional if you don’t have the skills, or knowledge or are not in the condition to perform the repair safely.
This is Why Your Electric Mower Won’t Start
Mower Key or Safety Button Is Not Fully Engaged
Most mowers require a safety key or a button to be depressed to turn on the mower. This safety feature is an added step to the starting procedure to ensure the mower doesn’t unintentionally start.
In the event this occurs, all you need to do is push the key in further or remove it and reinsert it. If it still doesn’t work, you may have a problem with a bad switch that doesn’t recognize the safety device.
Push Mower Handle Side Rails Are Not Set Up Correctly
There are safety switches in place to prevent you from starting your mower if the handle is not set up correctly. The foldable handle must be unfolded and secured in the operating position.
If your model mower has side rails on the handle, they must be extended to their maximum length. The clamps to hold the side rails in this position must be locked.
There is the possibility the side rails can move out of position causing your lawn mower not to start.
If this happens to you, release the clamps, check that the handle is in the correct extended position, and secure the clamps.
Incorrect Starting Procedure
Whenever you get a new mower or one that is just new to you, make sure you check its user manual to know all of your mower’s safety features and safety recommendations.
The safety button or safety key is a safety mechanism meant to prevent children from accidentally depressing the safety bar and starting your mower. Not following this procedure will prevent your mower from starting.
Here is the starting procedure for most battery-powered mowers:
- Securely insert the battery.
- Insert the safety key and press the safety button. (Not all models have a safety key).
- While your safety button is depressed, pull the safety bar to meet the handle. This will start the mower.
- Release the safety button.
- The mower will shut off when you release the safety bar.
Insufficient Power Source
Without sufficient power, your lawn mower will not start.
If you’re certain that the issue doesn’t lie with your initial starting step (i.e., key/safety button and safety bar engagement) then it’s time to turn to the next likely culprit, which is your lawn mower’s source of power.
The first place you should start on a cordless mower is with the battery connection and then take a glance at the battery and charger.
Check the extension cord and electric supply for a corded mower.
Battery is Not Correctly Installed
The battery must be inserted correctly and make a good connection with the battery holder. Follow these steps to check battery installation:
- Wipe around the battery cover before opening it so loose dirt doesn’t fall into the battery compartment.
- Remove the battery.
- Wipe the battery contacts and remove any dirt from the compartment.
- Slide the battery into the guides. On most models, you’ll hear a click when the battery snaps into place and the battery-release button springs into place.
- Close the battery compartment cover.
Battery is Excessively Hot
When the battery gets excessively hot, your mower will shut down and not start. You will need to let the battery cool before you attempt to restart it.
Battery Is Dead
Many mowers don’t rely on power from an electrical outlet to run, but rather, they draw it from a battery. Therefore, it comes as no surprise that your lawn mower won’t start if your battery is dead.
Some mowers have a display showing you the charged level of the battery. If your mower doesn’t have a display on the mower, the battery charger may use an LED lighting system to indicate your battery charging status.
You can tell your battery is going bad when you fully charge the battery and it is not holding a charge as long as it once did.
Losing the ability to hold a charge is a sign the battery is dying. Another sign your battery is going bad is when it becomes very hot.
You will want to buy a replacement battery if you begin to notice your battery can’t hold a charge, is charging very slowly, or is getting extremely hot.
Batteries begin to fail because they become old, are exposed to extreme temperatures, or fail mechanically.
Power Supply Is Not Connected or Properly Paired (Corded Models)
Some mowers, especially push models, need to be plugged into an electrical outlet to have sufficient power to run.
Because the average U.S. lawn is approximately a 1/4 acre, it is highly unlikely you’ll be able to mow your entire lawn using just the cord length your lawn mower provides.
As a result, most owners will pair their mower with an extension cord which is where a common issue derives.
Sometimes, an electric lawn mower won’t start because it is either improperly connected or paired. The connection part is simple.
Check your outlet and other electrical cord connections to ensure they are all fully plugged in. You might also want to ensure the outlet you are using is capable of providing the amount of power you need for this hefty machine.
If your connections are all correct and you know your outlet is capable of powering your lawn mower, then you should check your extension cord.
The average corded push mower will need an extension cord that can supply somewhere between 13 – 15 amps to run smoothly without risking the machine or cord’s longevity.
If you’re using an extension cord that only supplies, perhaps, 6-10 amps, you might find that your lawn mower is having trouble turning or staying on.
Improperly pairing your mower with an extension cord also increases your chances of overheating both components, resulting in potential damage and creating a fire hazard.
Therefore, it is best to make sure whatever cord you are using is rated for your electric lawn mower and capable of powering it safely.
Tripped the Power Supply (Corded Models)
If you are running a corded mower, make sure you haven’t tripped a power supply. Make sure you are running a good extension cord. One that is able to handle the power of the mower.
Once you’re sure your extension cord is working properly, check the breakers within your home to see if anything has shut off or appears damaged. If everything appears to be in working order, you can test your outlet by plugging in a simple appliance, like a lamp.
Bad Safety Switch
If any of your safety switches fail, your mower may fail to start. You can test each switch by temporarily bypassing them with a jumper wire.
Lawn Mower Repair : Electric Lawn Mower Troubleshooting
Replace any bad switch. For your safety and the safety of others, never operate your mower without all of the safety switches in working order.
- Switch for the foldable handle.
- Switch to ensure side rails are fully extended. (if your model has sliding side rails).
- Switch for the safety bar. The bar must be pulled into the handle to operate the mower. When the bar is released, the mower will shut off.
- Switch for the safety button.
Read your owner’s manual for any additional safety switches that may be installed on your EGO lawn mower.
Loose or Pinched Wires
There are many electrical wires running through your lawn mower. Some of these wires may develop a short because they become loose or pinched.
Wiggle wires to check for a short. You can also use a multimeter to identify a short.
Push mowers are known to develop pinched wires that can prevent your mower from starting. A common place for a pinched wire happens to be in the area where the handle is folded into the machine for storage.
You can repair these loose or pinched connections using a wire nut. Before beginning the repair, remove the battery.
Also, check if you are still covered by its manufacturer’s warranty. Repairing a damaged wire yourself can void the warranty.
Plug-Ins Are Not All Connected
There is a vast network of electrical wires running through your lawn mower, especially if you have a large riding mower. Amidst all of these connections, it isn’t uncommon for a plug-in or two to come loose.
This will disrupt your lawn mower’s power supply and prevent it from starting. A great way to check this potential cause off your list is to open up your lawn mower, particularly around the battery, and check to make sure all of your plug-ins are connected.
Do this when the mower is off with the safety mode engaged if your mower has a safety.
Excess Grass Debris on Mowers with a Bagger
The primary purpose of a lawn mower is to cut grass and lots of it. While your mower may cut well, it can take a toll on the lawn mower as it collects excess amounts of cut grass, twigs, leaves, and other trimmings in its cutting bag.
Emptying the cutting bag on your lawn mower is something you should do routinely as regular maintenance. If your lawn mower isn’t turning on and you realize you haven’t emptied it in a while, it’s probably the cause of the issue.
When your electric lawn mower’s cutting bag reaches its full capacity, it will prevent your lawn mower from turning on since it cannot collect any more trimmings. To ensure this isn’t the case, simply remove the detached bag from your lawn mower to check its status.
If it’s full, empty the bag, reconnect it to your mower, and see if the issue is resolved. If not, you’ll have to keep troubleshooting.
Debris is Restricting Blade Rotation
Not all lawn mowers are equipped with a cutting bag, but that doesn’t mean it can’t still be clogged with trimmings preventing it from turning on. It is not uncommon for excess grass and other debris to get lodged or stuck in the mower deck.
Whether you have a riding or push mower, you’ll want to check underneath the deck near the blades to ensure there aren’t any trimmings built up that need to be cleared.
Large amounts of grass in the mower deck might be inhibiting your blade’s ability to rotate which can be the root cause of the lawn mower refusing to start.
If the blades on your lawn mower can’t turn properly, the machine will use safety features to prevent itself from turning on. This is to prevent motor damage.
So, make sure you check and clean your lawn mower’s deck after every use. Keep the mower blades sharp. Dull blades can magnify the problem and put more strain on the motor.
The Vents Are Clogged
Similar to a gas-fueled lawn mower’s air filters, your lawn mower is built with vents that are an essential component of your machine.
These vents help keep your motor cool and maintain an optimal temperature during use.
Clogged vents will increase the risk of overheating your motor. This is why most mowers won’t turn on when the battery is hot.
You will want to be extremely cautious when cleaning or unclogging your lawn mower’s vents, as you could potentially damage your motor in the process, which will definitely prevent the machine from starting.
Try to use a clean, dry cloth to wipe off anything that might be on the vent, and refrain from using any liquids as they disintegrate your motor’s lubrication.
In the event that you can’t clean or unclog your vent with a rag, opt for an air-related tool, like a compressed air can, to spray inside and dislodge any remaining debris.
Damaged Components
Hopefully, your lawn mower starting troubleshooting doesn’t come to this point, but if it does, you might have a pricy solution on your hands.
While it certainly is not ideal it’s inevitable that, at some point or other, components on your lawn mower are going to wear down and will need to be replaced.
Many pieces need to be replaced routinely and come at a minimal cost, but the most problematic pieces might cost you more than the lawn mower is worth after purchasing the replacement and any professional help required to fix it.
Therefore, you will want to check the components on your lawn mower and make a judgment call about whether it’s worth fixing depending on what is damaged.
Some common pieces that often need replacing on an electric lawn mower include:
We’ve already discussed most of these components and detailed how they can prevent your lawn mower from starting if they are damaged or out of place.
However, a few components we haven’t mentioned in detail that are relevant here are its start switch and motor.
If you discover that either of these pieces is damaged and likely the cause behind your lawn mower not starting, you’re probably better off taking your mower to a professional repair shop instead of fixing it yourself.
Not only are these components usually pricy, but they are best handled by individuals with extensive mechanical and electrical knowledge who can safely remove the damaged parts and reinstall new ones.
Electric Mower Still Not Starting- Do I Need a Professional?
So your mower is putting up a fight again and won’t start. Hopefully, this isn’t a pattern, but if it is, you might be wondering if the issue is something beyond your abilities and requires a professional. Unfortunately, you might.
Whether you need a professional to get your lawn mower to start truly depends on the root cause of the issue. Thankfully, the majority of common reasons we listed previously can all be fixed by yourself and are likely to be the reason behind your problem.
We recommend you receive professional help for damaged components such as the motor and starter switch.
These components are much trickier to remove and install without proper knowledge and could result in personal injury or damage to your lawn mower if done improperly.
Electrical Diagnosis of Riding Lawnmower that Won’t Start
You might want to also seek professional help if nothing on this list appears to be the issue and you are at a loss for what is preventing your lawn mower from starting.
The best thing to do is contact your mower manufacturer for the procedure to have your mower looked at, especially if you are still under warranty. You may have to drop your mower off at a local location or you may have to ship it to a repair facility.
Here are common electric mower manufacturers’ contact information:
| EGO | EGO locator | 855-346-5656 |
| Greenworks | Greenworks locator | 888-909-6757 |
| RYOBI | RYOBI locator | 800-525-2579 |
| STIHL | STIHL locator | 800-467-8445 |
| Toro | Toro locator | 888-384-9939 |
| Sun Joe | 866-766-9563 | |
| SKIL | SKIL locator | 877-754-5999 |
How to Prevent Issues with An Electric Lawn Mower Not Starting
It happens to everyone. Your lawn mower was running perfectly fine, and then today, when you took it out, it just refused to start, and you’re now in need of a replacement.
Replacing lawn mowers can be a vicious cycle if you’re doing so frequently, especially considering how pricy they are.
So, if you find that you have trouble getting your lawn mower to start more often than you’d like and are wondering what you can do, the best advice we can give is maintenance.
Regularly maintaining your electric lawn mower will do wonders in preventing common issues, such as the inability to start. A lot of the reasons listed above are just part of general maintenance that you can incorporate into your weekly, monthly, or seasonal use.
For instance, you should always empty the cutting bag and clear the deck of trimmings after every use, so it is clean and ready to go the next time you use it.
You can also keep track of your battery’s age and charge, so you know when it will likely need to be replaced in the future.
If you have a rechargeable battery, try to charge it an hour or two before you intend to use the lawn mower so it is at full power. If you leave a fully charged battery to sit in your lawn mower, it will often lose some of the charges over time.
Simple steps like these, in addition to regularly checking your lawn mower for wear and tear, will prevent most of the reasons listed above that prevent it from starting.
It will also increase your lawn mower’s longevity drastically, so you aren’t constantly purchasing replacements every few years, which of course, is beneficial for your wallet as much as your mental sanity.
So, check and maintain your lawn mower regularly and remember that in the event that where it doesn’t start, the reason is usually something simple and easy you can solve yourself.
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Electric Lawn Mower Not Starting? It’s One Of 12 Issues
Well, wouldn’t you know it? You’ve got the time finally to attack the lawn you’ve been meaning to get to and what happens? Nothing.
Not because of anything you’ve done. No, you’ve planned to get this done.
Yet, regardless of all your planning, your trusty electric mower just won’t start.
Okay, maybe that’s all a bit dramatic. Perhaps you just figured it was as good a time as any to hit the lawn with a well-deserved trim. Or maybe there’s a storm coming through and you wanted to get the mowing done before the grass became saturated for a few days.
Regardless of the circumstances, the main thing is your mower isn’t cooperating, so there’s not going to be any mowing until you figure out what the issue is. That’s the dramatic part.
Just remember, when it comes to an electric mower not starting, whether it’s a corded or battery-powered mower, it will probably be an issue with the power supply (outlet/breaker or battery charger), power transmission (cord or battery), or the mower itself (breakers, connections, motor control switches, etc).
Before you start tearing anything apart in a desperate attempt to get your mower, well, mowing, below are some things to troubleshoot and things to consider that might fix the problem before you have to get a technician or service center involved.
Safety First
First, let’s go ahead and get this out of the way. Always remember safety first when it comes to troubleshooting any kind of equipment that can either cut off fingers or electrocute you or both. That’s a bad day that should be avoided at all costs.
Second, have your manufacturer’s manual (or owner’s manual, whichever you prefer) available. If you don’t have a hard copy, you can probably find it online by doing a Google search that looks like, “[Your Brand] [Model Number] Manual PDF.”
Once you have that ready, you’re ready to start troubleshooting.
Troubleshooting Processfor a Corded or Battery-Powered Mower
Before we get to the specific electric mower you have, the troubleshooting process will follow essentially the same path in this general order:
- Inspect the power transmitter (the cord for a corded mower and the battery for the battery mower).
- Insect the power supply (the outlet and circuit breaker for a corded mower and the battery charger for the battery mower).
- Inspect the power receiving end on the mower.
- Consult your warranty information and contact service center if necessary.
A Corded Electric Mower
Before we determine what the power issue with your electric mower may be, first it helps to know the type of electric mower you have. In this case, let’s assume you have a corded mower.
Let’s also assume that, until this moment, you’ve had zero issues with the mower when it comes to starting and stopping it or anything related to sources of power.
Now, let’s troubleshoot.
Inspect the Cord
If it is a corded electric mower then the first thing you’re going to want to do is to inspect your cord. As most corded mowers do not come with a manufacturer’s provided cord, you have to provide your own extension cord. It should be a standard 16-gauge grounded cord and free of any cuts or other visible damage. Also, check the prongs on the male end and the female end for damage. Lastly, check the male end on the mower itself.
Inspect the Outlet and Breaker
If you’re satisfied the cord is good, try plugging it into another item from the same wall outlet. If there’s no power at the outlet, then you’ve probably identified the issue. It could be a loose wire, a bad outlet, or a tripped breaker. Check one after another until you find the problem.
Check the Breaker and Motor Control Switch
If there isn’t a problem at the outlet or breaker and the cord successfully powers something other than the mower, then the issue is probably at the mower itself.
At this point, check the connection at the mower again to make sure it’s tight and holding firm.
From here, go to the breaker on the mower itself. Push RESET and see if the mower has power now. If it does, there was your problem. If it doesn’t then you may have a bad motor control switch. At this point, unless you know how to repair or replace such a switch, you’ll probably need to consult a service center or repair technician.
Warranty and Corded MowerTroubleshooting Review
One thing to check that’s not on the mower but applies to it is how old it is and if you still have a warranty on it, whether it’s a manufacturer’s or from the store it was purchased at. If you still have a warranty, don’t do any more work on the mower and place that warranty-issue call to get it fixed.
That pretty much sums it up for a corded electric motor. If it isn’t starting, check the power supply at the plug and main breaker, the power transmission at the cord, and final the power receiving at the mower itself. Do that in that order. From there, if you can’t identify the problem, time to call for help.
A Battery-Powered Electric Mower
Okay, now if you don’t have a corded electric mower but a battery-operated model, then this section is for you. However, you should still read through the corded mower section because you might pick up on something there that might help someone you know down the road.
Like the corded mower, let’s assume your mower has functioned normally until this moment and, unexpectedly, it’s just not starting.
Well, clearly there’s a power issue of some sort. So, let’s get to troubleshooting.
Inspect the Battery
With inspecting the battery, you should be looking for any kind of visual damages or leaks. Also, check the battery light to ensure it does indicate a charge. It might not be true but check all the same.
While inspecting, also make sure the battery is dry. A damp or wet battery can cause a short, lead to overheating, and cause a breakdown. If you believe this happened, you shouldn’t have a solid charge on the battery at all.
Speaking of charges, if everything looks good, and you have a battery tester, this would be an ideal time to test it. That way, if it’s not showing a charge even though the indicator lights up green, then you know the battery is probably bad and needs replacement.
Inspect the Battery Charger
If your battery is charged and you’ve tested it and you’re confident it is, then your battery charger should be operating properly. However, if you’ve got no charge on the battery after testing it, check the charger to see if there’s an issue there.
One way to test the charger is, of course, to put another battery on it and see if it charges. However, not everyone has extra lawn mower batteries. Really, the only thing you can do here is to inspect the charger for damage, check the outlet, and inspect the breaker as you would do with a corded mower.
Another thing you can do is use a volt meter. A positive result would indicate that a charger is at least supplying energy but the battery probably can’t hold a charge for long. A negative result would indicate that the charger itself is bad.
Store Your Mower in a Dry Place
Another tip that sounds obvious but one that’s very important when it comes to electric mowers. Remember, water can seriously damage an electric mower, especially a battery-operated one.
Store Your Cord and Battery After Use
Don’t leave the cord with the mower where it can get damaged. Store it somewhere it is easy to get to but won’t be affected by things like sharp blades or wheels. You get it.
For batteries, remove them after use and charge them but don’t leave them on the charger all the time. Also, don’t run the battery completely dead all the time. Running a battery to both extremes can diminish its service life quicker than normal.
Visually Inspect the Mower Before Use
Again, it sounds obvious but it’s good advice, especially if you haven’t taken a look at the blades in a while.
Conclusion
When you use equipment that runs on electricity or gas, eventually you’ll have an issue that needs some special troubleshooting attention. The good news is, with electric mowers, it doesn’t take much time to figure out what the issue might be and when you’ll need to call for assistance.
Just remember to always be safe, walk through the steps, and be patient. Electricity is a wonderful thing but it isn’t magic. Be safe and remember to call for help if you need it.
I’ve been helping homeowners with appliance repair since 2016. Starting out as an enthusiastic amateur, I’ve since worked with many Appliance, HVAC, and DIY experts over the last 7 years. My mission is to help your fix your appliances and systems. saving you money and lowering your energy bills. Visit my author page to learn more! Read more
Hi there! My name’s Craig, and I started Appliance Analysts back in 2017.
My mission is to help our readers solve appliance-related issues without paying through the nose for contractors or a whole new model. I’m joining up with experts from across the HVAC, Appliance Repair, DIY industries to share free expert advice that will save you time, stress, and money.
My mower won’t start
Starting problems with your lawn mower fall into 2 basic causes: fuel problems and ignition problems. The following is a simple checklist you can follow to help isolate a possible cause. This is not an exhaustive guide and certainly not a repair manual. However, there a few steps you can take before taking it to the repair shop for a thorough fix.
Fuel
This is the first and most obvious thing to check, especially if you weren’t having startup problems last year. Be sure that the machine has an ample supply of fresh fuel. It’s amazing how often people will get their mower out of cold storage the first warm day in spring and find their mower just won’t start. Forgetting that they left the fuel in the tank from the previous year. Today’s fuels don’t age well. In fact today’s gasoline is much like milk and starts to go bad quickly, often in as short a period as 60 days.
Ignition
Make sure that the ignition switch is on, that all attachments are disengaged and that the transmission is in neutral. Most machines have safety mechanisms that will not allow them to start otherwise. Consult your owner’s manual for the starting procedure for your machine.
Make sure the spark plug wire is firmly attached to the spark plug.
If it still doesn’t start, check for a spark by removing the spark plug and grounding the hex part of the spark plug to a bare metal part of the engine. Remove any spilled gasoline that is nearby first, then spin the engine by pulling the rope or turning the key. You should see a blue spark jump across the plug gap. If you have a good hot spark, skip to the carburetor section.
lf the spark is yellow and weak, or there is no spark then the first thing to do is try a new spark plug. Don’t try cleaning the old one. Set the new plug gap to the proper spec (usually 0.030) and check for spark again. If you do see a spark, install the new plug and try to start the machine.
If there’s still no spark, try cleaning and setting the points on older machines, or replacing the electronic ignition module on newer machines. Before replacing the old module test it by disconnecting all the wires from the module terminal that connect to the kill switches and recheck for spark, if you do see a spark then a wire or switch is probably defective. Also check the flywheel key. That affects the spark timing, usually the key will need replacing if you strike something while mowing and the engine stops.
Checking the carburetor and fuel system
If the fuel is fresh, you have a good spark and still won’t start, you must make sure that fresh gasoline is getting to the carburetor. Make sure that the fuel shutoff valve (if present) is opened, and that the fuel line is not plugged or kinked.
Also be sure the fuel cap vent is open and any screens in the tank are clear of debris. If fuel can flow to the carburetor, carefully place 1 teaspoon of gasoline down the spark plug hole (or a add shot of starting fluid into the carburetor throat). Re-tighten the plug and try to start the machine. If it runs for a second or two, then quits, chances are the carburetor needs to be serviced (disassembled and cleaned inspected, then rebuilt) or you have an air leak somewhere.
Make sure all mounting screws or bolts are snug and gaskets are not missing sections. If the carburetor is a bowl-type check for water in the bottom of the bowl (but do not let the float swing all the way down or the float needle will fall out!).
Hopefully, this will give you a little insight in what to look for if your mower won’t start. Most starting problems are fuel related because the previous year’s fuel wasn’t removed. You may have gone years without removing the fuel at the end of the year without having any starting problems. There is a chemical process called varnishing that puts a coating on the inside workings of your fuel system. Over time this process continually worsens until your system becomes inoperable.
Precautions
Gasoline can ignite very easily. Work only in well-ventilated areas and away from sources of heat, sparks, and flames. Always wear safety glasses, and be careful of sharp blades. Keep a fire extinguisher nearby.
Why Is My Lawn Mower Turning Over But Not Starting: Easy Fix
“Why is my lawn mower turning over but not starting?” is a question we get a lot from lawn owners. This is a common problem that may arise for a number of reasons.
The good news is that it is very easy to figure out why a mower is not starting despite it turning over. Read our comprehensive list of all these lawn mower faults and their easy solutions in this guide.
- Why Is Your Lawn Mower Turning Over But Not Starting?
- – Problematic Spark Plug
- – Wire Not Connected to Spark Plug
- – The Air Filter Might Be Dirty
- – An Empty or Contaminated Fuel Tank
- – A Faulty Carburetor Filter
- – The Mower Deck Might Need Cleaning
- – The Flywheel Brake Might Not Be Working
- – Fix Your Spark Plug
- – Connect the Spark Plug Wire Properly
- – Clean the Dirty Air Filter
- – Clean Your Fuel Tank
- – Fix the Carburetor Fuel Filter
- – Clean the Mower Deck
- – Repair the Flywheel Brake
- – How Do You Clean a Lawn Mower Carburetor Without Removing It?
- – How Do You Know if Your Lawn Mower Fuel Line Is Clogged?
- – How Do You Get Your Lawn Mower To Start After Sitting All Winter?
Why Is Your Lawn Mower Turning Over But Not Starting?
Your lawn mower turning over but not starting due to several reasons, such as a faulty or disconnected plug, a disconnected spark plug wire, a clogged air filter, or a contaminated fuel tank. A faulty carburetor, a dirty cutting deck, or a dysfunctional flywheel brake can also cause this.
– Problematic Spark Plug
The most probable cause of a mower not starting properly might lie in a problematic spark plug. This plug is responsible for producing the spark that ignites the fuel in the engine.
This plug usually stops working when it becomes loosened or disconnected and cannot generate a spark. Over time, it can become coated with carbon or water residue and stop working properly. It is very easy to fix a faulty plug – you simply have to take it out and visually figure out where the problem lies.
– Wire Not Connected to Spark Plug
If the spark wire is not in close contact with the plug, the lawn mower naturally will not start, regardless of how hard you try. If the rubber cover over the plug is not placed properly, then this will also prevent the wire from contacting the plug. You will need to check the plug and the wire without removing either of them to see if this is where the problem lies.
– The Air Filter Might Be Dirty
The purpose of an air filter is to let air inside the engine so that the oxygen in it can help combust the gas and start the engine. Over time the airflow into the engine gets compromised because of a dirty filter.
The filter naturally collects things like dirt, dust, and other impurities. Eventually, it becomes so clogged that it stops all but a little air from entering the engine.
Usually, this filter is located near the top of the filter and is covered by a plastic or metal coating. You will have to unscrew the coating to get access to it.
– An Empty or Contaminated Fuel Tank
An empty gas tank can commonly cause this problem. Also, if the gas in the fuel tank has been left standing for too long without changing, then such a fuel tank will not catch a spark either. Even if the gas is just one month old but is being used without a fuel stabilizer, you will face this problem.
Similarly, a gas that has somehow been contaminated with dirt or moisture is useless and will not work.
– A Faulty Carburetor Filter
Another common reason why push-type or riding lawn mowers do not start despite turning is a carburetor that’s filled with too much residue. That is why it is recommended that carburetors be cleaned up at least once a year as part of regular maintenance.
This is not such a common problem. That is why you must first check that the ignition switch, air filter, etc., are working properly.
Another common sign of a clogged carburetor is that the engine might turn and start stalling. There might be black smoke emitting from the muffler. There will also be increased fuel consumption by the machine or weird noises from the engine.
Weird sounds like something splashing in the engine also means something is wrong with the carburetor. Other signs are the engine backfiring or being unable to accelerate.
– The Mower Deck Might Need Cleaning
The concept of a cutting deck is that it collects grass clippings and prevents them from spraying into the air. However, these clippings eventually clog up the mower and prevent the blade from cutting grass.
This especially happens when you habitually mow wet grass because such grass clumps together. That is why mowing dry grass is better for the lawn and the lawn mower over the long run.
– The Flywheel Brake Might Not Be Working
The purpose of a flywheel brake is to keep the engine running smoothly. They also help cool the engine and maintain the speed of the power strokes.
When the riding mower hits a hard spot, the brakes help absorb some of the damage. If your flywheel has been damaged, the mower won’t start but will, in fact, turn.
How To Fix a Lawn Mower That Is Turning Over But Not Starting?
To fix a lawn mower that is turning over but not starting, you can fix your spark plug. clean the airway filter, clean the fuel tank, fix the carburetor fuel filter, clean the mower deck, and repair the flywheel brake.
– Fix Your Spark Plug
First of all, find where the faulty plug is located. Usually, it is present at the front of the mower. Disconnect the plug wire to reveal the plug present underneath. You will likely need a wrench to unscrew the plug and take it out for observation, especially the insulator and the electrode on the plug.
If it is dirty with residue build-up, then only an easy clean-up is needed. Use a brake cleaner spray on this build-up, let it stay there for a few minutes – so the dirt gets dissolved – and then wipe it off with a clean cloth. Reinstall the plug in the machine and see if the problem has been resolved.
In some cases, you will need to change the plug with a new one. See if the electrode is missing or burnt or if the plug coating has been compromised. You can easily find new spark plugs at a reasonable price at any hardware shop.
– Connect the Spark Plug Wire Properly
If the problem lies in the wire not contacting the plug properly, then all you need is to connect the two. See if the rubber coating on the plug appears loose and pushes down in that case.
Tighten the rubber covering and also make sure that the wire is exposed enough to make adequate contact. If the rubber covering has been burnt, torn, or damaged in any way, then order a new one and replace the old one.
– Clean the Dirty Air Filter
If your machine won’t start because of a clogged air filter, then all you have to do is to clean it. Before unscrewing and removing the covering to the filter. you must disconnect the spark plug first. Then remove the metal or plastic encasing protecting the filter.
Take the filter out and inspect it carefully before cleaning. In the case of a paper filter, tap it gently on a flat surface to remove dust and dirt. Hold the filter up to a light source and see if it is blocking light from it. If so, replacing the filter with a new one is best.
In the case of a foam filter, use water and any dishwashing soap to cut grease and remove dirt. Squeeze it to remove all extra water, and then dry it thoroughly. Apply oil to your hands and use it to lubricate the filter thoroughly. Ensure that the oil is not dripping off the filter but only lightly wetting its surface.
Before reapplying for a clean filter, you should also cover the fitting with which the filter will be attached. Only use dry cloth because using compressed air or solvents might damage it. Replace it carefully and then cover it with its covering that has been cleaned as well.
– Clean Your Fuel Tank
If the problem lies in bad gas within the fuel tank, then you need to take it out. Use an oil siphon pump to drain the old gasoline out. Use the good old gravity method if you do not have a pump. Disconnect the carburetor from the fuel tank and place a container underneath to collect the gas.
Be careful not to spill the gasoline anywhere because this can lead to several problems. After your tank is emptied, it is time to clean any impurities. First, use only boiling water to wash the inside of the tank. and then use water mixed with a good quality fuel detergent.
Use a brush to scrub the inner walls if impurities are stuck. Give a final wash using clean water, dry the tank, and then refill it with fresh gas. This time add a fuel stabilizer to the gas to keep it from going bad.
– Fix the Carburetor Fuel Filter
Before cleaning the dirty carburetor, it is better to clean the outside of the mower beforehand. In most riding mowers, the carburetor lies on top of the air filter. and you will need to disassemble it and take it out in order to gain access to the carburetor. For other mower types, use the instructions manual to find out where and how to gain access to it.
You can use a carburetor cleaner to clean the insides of the carburetor bowl while it is still attached to the mower. To clean it thoroughly, however, you must take the carburetor out. Unscrew the nuts first and then disconnect the cables attached to them.
Before disconnecting the fuel cable, put something underneath to collect the draining fuel. Notice the carburetor’s position so you know where to put it back.
One way is to spray carburetor cleaner all over it and allow it to soak for a while. Give it an hour until all the grime and grease get dissolved, and then rinse off with clean water. You can then allow the carburetor to dry in the air or speed up the process using a blow drier.
Please do not put the carburetor back until all its parts are completely bone dry. Make sure that everything is back exactly how it was beforehand.
– Clean the Mower Deck
If your blades seem unable to rotate and cut properly, it might be time to clean them. In fact, the deck needs to be cleaned at least twice during each regular mowing season. Cleaning the deck is a piece of cake, but you must do it properly.
Either run the mower or the lawn tractor for as long as it takes for the fuel to run out. Otherwise, you can drain the fuel yourself by collecting it into a can. Disconnect the plug that starts the engine because you should not risk the lawn mower starting accidentally while cleaning the blades.
Tip the mower on a flat surface over its side, making its blades easily accessible. The easiest method is to use a hose to blast the blades at full speed. Most of the grass clippings and dirt will be forced off by this alone. Then use water, soap, and a sponge to scrub off all the rest of the dirt stuck on the deck and the blades.
Wash everything off using clean water and allow the deck to dry. A clever hack we employ is to spray some vegetable oil all over the deck lightly. Move the mower back into the standing position and reattach the ignition plug. Start the mower to see if it has started working now.
– Repair the Flywheel Brake
First, check the brake pad to see if it makes adequate contact with the flywheel. Also, check if something is blocking the cutting blade and preventing the flywheel lever from moving freely.
Sometimes the flywheel brake’s covering gets torn when something particularly hard gets tangled in the cutting blades. You will need to change the brake in this case. In order to do that, the entire mower will need to be taken apart.
Frequently Asked Questions
– How Do You Clean a Lawn Mower Carburetor Without Removing It?
You clean a lawn mower carburetor without removing it by getting a commercial mower carburetor cleaning solution. However, in order to gain access to the carburetor, the filter that cleans the air going into the engine must be unscrewed first.
Make sure you have removed the gasoline from the fuel tank beforehand and disconnected the ignition plug. After gaining access to the carburetor, spray the cleaning solution into it. Allow at least an hour, so the cleaning solution dissolves all the grease.
Use a sponge or a brush to scrub the insides of the bowl as thoroughly as you can. Then use hot water to clean off the cleaning solution and all the dirt.
– How Do You Know if Your Lawn Mower Fuel Line Is Clogged?
You know if your lawn mower fuel line is clogged if the engine will take a long time to start after significant spluttering. The overall performance of the mower engine will drop drastically, and you will experience a lot of random stopping or braking while using the mower.
Especially while driving at low speeds, your mower will frequently come to a halt by itself. This naturally happens when the fuel line randomly blocks the fuel supply to the engine.
– How Do You Get Your Lawn Mower To Start After Sitting All Winter?
You get your lawn mower to start after sitting all winter by charging your battery. If the battery has rusted over the winter, use hot water to clean it up first and then charge it. You’ll also need to empty the gas tank if you haven’t done it before winter.
So if your gas tank still contains fuel, the new spring season is the time to empty it. The carburetor will need to be unscrewed first. and then you need to disconnect the line connecting it to the fuel tank. Collect the old gasoline dripping down from the carburetor into a container.
Next, you must fill the fuel tank with fresh and clean gas. Smelling carefully is one of the easiest hacks to check if the gas is fresh. Check the oil in the mower and refill it with clean oil. Lastly, we suggest you clean the mower thoroughly before starting it after a long break.
Conclusion
Congratulations, this marks the end of our complete article regarding why your mower might not be starting properly.
Here is a summary of all the reasons and their quick fixes:
- A faulty or disconnected spark plug is the number one reason why lawnmowers might not start. All you have to do is to fix it or have it exchanged in case it is beyond repair.
- If the air or fuel filter is not working properly because it has clogged over, it will also need to be cleaned or changed.
- A mower deck with wet grass clippings and grime should be washed off regularly to keep the mower going.
- If your blades seem unable to rotate and cut properly, it might be time to clean them.
We have discussed all the common reasons that stop a mower from starting despite turning over. If your mower is giving you problems, our guide will help you find out the problem and solve them in no time.