Honda lawn mower exhaust. Honda Aiming For 150 MPH To Reclaim Fastest Lawn Mower Record

Why Is My Lawnmower Shooting Flames? Expert’s Interview

Lawnmowers are sensitive machines, and every part plays an important role in running the engine smoothly. If anything happens to any of the components, it may prevent you run the machine smoothly.

Why is my lawnmower shooting flames?

One of the main reasons could be that the exhaust system is filled with unburnt fuel, ultimately causing firing issues. Since it is a serious issue, you want to address it soonest to prevent damaging the exhaust manifold and other components.

  • Why Is My Lawnmower Shooting Flames?
  • Giving Pressure
  • Cutting Tall And Thick Grasses
  • Fuel Hazards
  • Excessive Fuel
  • Poor Performance Of Spark Plugs
  • Using Old Fuel
  • Imperfect Air/Fuel Mixture
  • Bent Valve Or Valves
  • Wrong Ignition Timing
  • Older Lawnmower
  • High Engine Temperature
  • Adequate Oxygen
  • Air leakage
  • Replace Spark Plugs
  • Maintaining A Healthy Exhaust

Why Is My Lawnmower Shooting Flames?

There could be several reasons your lawnmower is shooting flames. Since it could lead to dangerous accidents, you want to address it soonest. Here are all possible reasons when you want to know about “Why is my lawnmower shooting flames?”

Giving Pressure

Are you giving more pressure to the lawnmower? When you mow grass for several hours without any single break, the engine becomes excessively hot.

As a result, the piston moves slowly, and it fails to comply with the firing cycle of the spark plug. Some portion of fuel fails to burn and moves to the exhaust system without burning.

Finally, when the ignition system starts, your lawnmower is likely to shoot flames. The earlier you stop the machine, the better it is.

Cutting Tall And Thick Grasses

Do you cut tall and thick grasses often? Have you checked whether the mower deck doesn’t stick anything?

If the blazing hot muffler is completely filled with grasses, your lawnmower has a probability of shooting flames. At worst, this may burn out the lawn too.

Fuel Hazards

The normal stability of a lawnmower motor is compromised if fuel leaks in the engine. This can lead to flame. In addition, if a hot muffler is surrounded by fuel vapors, it can also cause a flame.

Excessive Fuel

Initially, if excessive fuel exits inside the combustion chamber, your mower may shoot flames. So, why it occurs? It occurs when the air-fuel mixture becomes excessively rich from the adjustability of the carburetor.

Poor Performance Of Spark Plugs

Are the spark plugs performing the way they should be? If there is a lack of oxygen, incomplete combustion occurs, making the spark plug weak or misfiring.

At first, this will lead to smoking. Then extra heat is generated, making the exhaust hotter. At last, flames will come out from the exhaust pipe.

Using Old Fuel

Are you using too old fuel for your mower? Changing fuel is necessary once a month. Old fuel may lose its quality when it sits idle for a long time. Using this old fuel can cause smoking issues and ultimately shoot flames.

So, these are the possible causes you want to check out if you wonder, “Why is my lawnmower shooting flames?”

What Does It Mean When Your Lawnmower Backfires?

Is your lawnmower backfiring? Not taking immediate action will lead to heavy damage to your mower.

What does it mean when your lawnmower backfires?

When your lawnmower engine backfires, it is failing to generate the same amount of power it used to do. As a result, fuel inefficiency occurs, and the machine uses more fuel to produce energy. You may also hear loud popping noise coming out from the mower.

So, what are the signs of misfiring a lawnmower? You can understand whether your lawnmower is misfiring or not by checking out these symptoms:

  • The unpleasing smell coming from the mower
  • The mower makes unusual sounds when it runs on
  • The engine is losing its power
  • You may struggle to start it
  • the exhaust pipe is releasing an excessive amount of smoke

You have already learned about “What does it mean when your lawnmower backfires?” and “What are the symptoms of misfiring lawnmower?”

Here are the possible reasons you should check to learn to find the reason behind misfiring issues in your lawnmower.

Imperfect Air/Fuel Mixture

You should neither have a high or low air/fuel mixture. The ratio should be stable — not too low or too rich.

If there is a low air/fuel mixture, the engine has less fuel but high air. Imbalanced ratio. This may happen due to low fuel pressure. It is also known as “lean mixture.”

When it happens, some fuel and air fail to reach inside the exhaust valves at the right time as they burn slowly. As a result, backfiring occurs.

Bent Valve Or Valves

A lawnmower has several cylinders, and each cylinder includes one exhaust valve and one intake valve. The job of an exhaust valve is to pass burned gases from the cylinder.

On the contrary, the intake valve enables an ideal air-fuel combination to enter the cylinder.

However, when a valve vent, it doesn’t have a perfect close or opening. As a result, the fuel fails to pass through the exhaust or intake valve to combust. This leads to backfiring issues.

Wrong Ignition Timing

This is the best ignition coil for a lawnmower available in the market.

When wrong ignition timing occurs, the spark will fire either too late or too late. In both cases, the intake or exhaust valve may combust, causing backfiring. You can’t diagnose this problem unless you are a professional mechanic.

Older Lawnmower

Are you using an older lawnmower? Latest lawnmowers are tuned up finely through computer systems. That’s why they can constantly adjust their internal system to make the mower run smoothly.

However, the older lawnmower may not do this like the latest models. They often fail to control the sparks when it is fired and the perfect air-fuel ratio.

High Engine Temperature

Commonly, your lawnmower temperature will rise when you use it. But if the temperature increases unusually, there is something concerned.

When this happens, you may notice the engine is backfiring and automatically shut down after running for several minutes.

Can A Backfire Damage An Engine?

The backfiring issue occurs for several reasons, which we have already discussed above. It will prevent you from running the machine normally.

Can a backfire damage an engine?

A backfire can damage the engine heavily if neglecting the issue for a prolonged time. You want to address the problem as early as possible to prevent damaging it completely.

How to stop backfiring issues for your lawnmower? Here are a few points you want to apply if your lawnmower is backfiring and save from extra damage.

Adequate Oxygen

Does your lawnmower have the perfect amount of oxygen? An ideal amount of air fuel is required to run the mower smoothly. It should be neither too rich nor too low.

When the oxygen level drops, excessive fuel will enter the system. Also, a high level of oxygen (air) will prevent entering an adequate amount of fuel.

Air leakage

Is Your Mower Has Air Leakage? If there is any leakage issue, you want to solve it soonest.

Replace Spark Plugs

Replacing spark plugs after a certain time is necessary. Over time, its construction weakens due to long-time use.

Using new spark plugs ensure perfect spark firing at the right time, also preventing backfiring issues.

Maintaining A Healthy Exhaust

The exhaust system is one of the most common parts where backfire occurs. This mainly happens when the exhaust system is unhealthy.

Proper functioning will be carried out because of this. That’s why maintaining a healthy exhaust system for your lawnmower is necessary.

Hopefully, you have learned about “Can a backfire damage an engine?” and how to stop this issue.

Can A Lawn Mower Explode?

Explosion for any engine can damage it and even make the owner heavily injured.

Can a lawnmower explode?

Yes! A Lawnmower can explode if it is a gas-powered rotary mower. If a leakage issue is seen in the gas tank, it may fire and create a small explosion.

While filling the gas tank, you want to make sure no spelling issues. Being uncareful, you may splash it on the hot muffler, causing firing issues and explosion.

Replace your muffler with the Best muffler for lawnmowers.

The tall grass is one of the primary reasons that could lead to a fire in the lawnmower. That’s why it is better to mow your lawn regularly, ensuring good conditions for your lawn and mower.

So, why do tall grasses cause firing and explosion issues?

The taller the grasses, the bigger the grass clippings. As a result, bigger grass clippings will stick inside the deck and enter the hot motor, muffler, or exposed parts.

When the clippings contact with the hot parts, they start to burn. After a certain time, they will catch fire and may result in an explosion.

Weather condition is another important thing you should note down. You need to choose a perfect time to mow your lawn, especially in the summer season.

During the season, the temperature becomes excessively hot, especially in the afternoon hours. That’s why you want to either mow the lawn in the early morning or evening hours to prevent excessive heat.


Everyone wants to run their machine without any issues. Sometimes unwanted problems pop up from the engine. Resolving it soonest is what we are supposed to do. Hopefully, you have learned everything about “Why is my lawnmower shooting flames?” and how to deal with the problem.

Last update on 2023-01-28 / Affiliate links / Images from Amazon Product Advertising API

Lee Safin was born near Sacramento, California on a prune growing farm. His parents were immigrants from Russia who had fled the Bolshevik Revolution. They were determined to give their children a better life than they had known. Education was the key for Lee and his siblings, so they could make their own way in the world. Lee attended five universities, where he studied plant sciences and soil technologies. He also has many years of experience in the U.S. Department of Agriculture as a commercial fertilizer formulator.

Thoughts on Why Is My Lawnmower Shooting Flames? Expert’s Interview

It’s powered by a 999cc engine from the CBR Fireblade.

Honda is keen to remind the world that it doesn’t just build cars. Or rather, the message here is that it doesn’t just build lawn mowers. It builds fast lawn mowers, though you won’t be able to buy one at your local hardware store. Once upon a time, Honda held the Guinness World Record for the fastest lawn mower. Now, the manufacturer wants the title back. and then some.

The Lawnmower Man:

The original record-setting machine from Honda was aptly named the Mean Mower.Back in 2014 it managed an average speed of 116.57 mph (187.6 km/h) and could reach a top speed of 130 mph (209 km/h) with the gas pedal throttle lever pegged wide open. It used a 1,000cc engine lifted from a Honda superbike, and it provided more than enough motivation to easily claim the record.

A couple of years later, a Norwegian team significantly one-upped the Honda crew by LS-swapping (yes, LS-swapping) a VIKING/STIHL lawn mower. With a thumping American V8 popping up front, the mighty mower managed a thrilling 134 mph (215.6 km/h) to steal the title from Honda.

At this point, you might still be pondering how lawn mowers going triple-digit speeds are even a thing, but that’s not important right now. What matters is Honda’s three-years-in-the-making response, and the plan involves another motorcycle engine – this time a 999cc mill sourced from a Fireblade SP superbike. It’s not a Corvette engine, but the 190-horsepower, high-revving screamer should still be enough to send this second Mean Machine mower to an eye-watering 150 mph (241.4 km/h), the target speed for this crazy creation.

If that’s not bonkers enough, there’s another interesting aspect to setting an official Guinness speed record on a lawn mower. It still must function as a lawn mower, so while this contraption is barreling through the air at speeds fast enough for airliners to take off, a set of carbon fiber blades will be spinning underneath. That’s not the least bit terrifying.

Would you have the guts to climb on this crazy mower and go a buck fifty with sharp blades spinning beneath you? Give us your best and worst case scenarios in the Комментарии и мнения владельцев below.

Source: Honda

Oil Coming Out of My Lawn Mower Exhaust: Why How to Fix

When it comes to engine oil, once you put it in, you never really want to see it again unless you’re refilling it or changing it out. The exhaust system in particular is separated from where your fuel and oil live so if you happen to notice oil leaking from the exhaust, you have plenty of reasons to be concerned.

That being said, it isn’t as difficult as you might think for some engine oil to get displaced. Figuring out how oil got into the exhaust of your lawn mower in the first place is a good way to begin tackling the problem.

Oil Coming Out of Lawn Mower Exhaust

If there is oil coming out of the lawn mower’s exhaust it is usually due to oil spillage from the lawn mower being tilted incorrectly, putting in too much oil, carburetor imbalance, a clogged air filter, or damage within the engine. Most of these issues aren’t too challenging to fix, but finding the correct cause can be tricky.

Potential Causes of Oil Coming Out of Your Lawn Mower Exhaust

If you’re asking yourself why is oil coming out of my lawn mower exhaust, you need to do two things: look closely at the telltale signs of each of these symptoms, and check that they apply to your type of lawn mower.

Oil Spillage from Incorrectly Tilting the Lawn Mower

There are quite a few things that can go wrong when you tip your lawn mower the wrong way. One of those things is oil spilling from your engine’s crankcase and leaking into the cylinders. From there, the oil will get pushed out through the exhaust valve. If oil has also leaked onto your air filter this is likely the culprit.

Solution: Be wary of steep slopes, and tilt your mower the right way when servicing it.

The safest way to tilt your mower is to always make sure the carburetor and air filter are facing up to prevent oil and gas from using gravity to escape. If you accidentally tip your mower over the wrong way, you’ll need to check your carburetor (and possibly clean it), check/replace your air filter, and wipe off any excess oil/gas. Anything leftover that you can’t reach will burn off as the engine runs.

Overfilling your Lawn Mower’s Oil

Putting too much oil in your lawn mower is a surefire way to end up with some leakage. Showing the same symptoms as tilting your mower incorrectly, oil can make its way through your engine and out your lawn mower’s exhaust when there is too much oil in the crankcase.

Solution: Add oil slowly to prevent overfilling, and drain any excess oil if you add too much.

Honda’s Mean Mower V2 mows the Duke’s lawn for Goodwood Festival of Speed

If you’ve leaked oil from putting too much in your mower, you’ll need to measure the oil level with your dipstick, make sure it is correct, and check your carburetor and air filter. Again, if they are soiled you’ll need to clean the carburetor and replace the air filter.

Carburetor Imbalance

If your carburetor is out of balance, the air and fuel mix entering your engine will be flawed and can lead to oil and gas leaking from your exhaust. Whatever fuel doesn’t get burned will be forced out via the exhaust. This leads to increased fuel consumption as the fuel gets wasted if it can’t all burn. If this is the case for you and there is a gas and oil mix leaking from your exhaust, it’s a good idea to consider this issue.

Solution: Adjust and clean the carburetor.

Cleaning and adjusting the carburetor will help your mower perform better in general, and once back in balance, you shouldn’t have any more leaking due to excess fuel. To clean the carburetor you should start by spraying some aerosol carb cleaner into it. If this doesn’t solve the problem you may have to disassemble the carburetor to clean it which is a fairly tricky job.

Clogged Air Filter

There are a bunch of dirty air filter symptoms, and as you probably guessed, oil and gas leaking from your mower’s exhaust is one of them (though usually just in extreme cases). If you have a super clogged air filter, your engine might not be able to get enough oxygen to burn all the gas it draws in. Just like an imbalanced carburetor, you’ll end up wasting fuel and could notice the excess leaking out.

Solution: Replace your air filter.

You’d have to have a pretty nasty filter on your mower to run into this issue, but luckily all you have to do is toss a new filter on. You might have to replace your filter if you run into some of these other issues anyways.

Engine Damage

While nobody wants this to be the case for their mower, engine damage can certainly be the reason for oil leaking out of your exhaust. Worn valves, damaged piston rings, blown head gaskets, and cracks in the engine block can all allow oil to leak out. If you’ve checked everything else and you also happen to have an older mower, things could be looking a bit more serious.

Solution: Gear up to do some internal engine repairs or seek help from a small engine professional.

If you have a good amount of small engine knowledge and tools at hand, you can certainly start poking around your engine to look for damage or faulty parts. I’m lucky enough to have a friend who knows a ton and could help me out, but if you can’t do it yourself or call in some friendly help, going to a pro is your best bet. If your lawn mower has a ton of seasons under its belt already, it might be nice to have somebody look it over anyways.

Oil Coming Out of Exhaust on a Four-Stroke Lawn Mower

Four-stroke mowers hold engine oil in their crankcase separately from the gas. like the style of a car, you add gas and oil separately. This means that oil isn’t the only liquid that can leak from the exhaust. Sometimes unburned gas will leak and it can look deceivingly like oil as it collects carbon and blackens on its way out. If you have a four-stroke mower, be sure to double-check what the leaking liquid is if you’re trying to get to the bottom of the problem.

For instance, if you end up having gas leaking out, you will want to look into the air filter and the carburetor first.

Oil Coming Out of Exhaust on a Two-Stroke Lawn Mower

Two-stroke mowers require engine oil to be mixed into their gasoline for lubrication while operating. As two-stroke motors burn fuel, the oil additive helps lubricate the engine. Because the oil and gas are stored together, you won’t be able to measure your oil level after you fuel up. Unfortunately, this could complicate your process of diagnosing any liquids leaking from the exhaust a little bit. Even though they use a gas and oil mix, tilting two-stroke mowers the wrong way will cause the same problems.

Oil Coming Out of Exhaust on Riding Lawn Mower

Riding lawn mowers have engines that are a bit more complicated but oil coming from the exhaust can happen for some of the same reasons as push mowers. Adding too much oil is probably the most common culprit when it comes to riding lawn mowers (partly because you’re not as likely to tilt your riding mower on its side).

However, if that isn’t the case and you have oil coming out of your riding mower/lawn tractor’s exhaust, there is a good chance you’re looking at the same internal engine problems as you would with a push mower. If you aren’t equipped to deal with push mower engines, you likely will struggle with your riding mower and are probably looking at a visit to your local mechanic.

The only other thing to take note of is that there is yet another liquid that could leak from a riding mower’s exhaust: engine coolant. This is usually pretty easy to distinguish and it is good to be aware of if you’re doing some investigating. Bad gaskets usually cause coolant leaks but so can cracks in the engine block.

Why This Problem Needs to Be Resolved Urgently

If you notice any liquid dripping out of your exhaust you should definitely take action. Having oil or fuel leaking from your lawn mower can result in:

  • Worsening Problems – If you do have internal engine problems, leaving them unattended will make them worse and lower the chances of repairing the parts. Oil getting around where it isn’t supposed to can also have a compounding effect as it will damage other parts like spark plugs and air filters. Plus, leaking oil means your engine doesn’t have as much oil as it needs to operate.
  • Dead Grass – Your lawn will not be very happy if your mower repeatedly drips oil or gas all over it and you could create some yellowed patches by ignoring this problem.
  • White/Bluish Smoke – I’m no stranger to starting my mower and having this type of smoke billowing out of the exhaust. Bottom line is that you don’t want to breathe it in and it’s hazardous to the environment.
  • Fire Hazard – Anytime you’ve got flammable liquids dripping onto the floor of your garage or shed, you’re asking for trouble. Even if you’ve got concrete floors it’s not good. A lawn mower on fire is a problem nobody needs. Plus, who likes oil stains!

About Tom Greene

I’ve always had a keen interest in lawn care as long as I can remember. Friends used to call me the lawn mower guru (hence the site name), but I’m anything but. I just enjoy cutting my lawn and spending time outdoors. I also love the well-deserved doughnuts and coffee afterward!

Комментарии и мнения владельцев

Thanks Tom – this article was helpful. I have oil spraying out of exhaust on my riding lawnmower. Now I have a place to start.

Hi Bret, Hopefully, the cause of your lawn mower spitting out the oil can be fixed with one of the easier fixes. Typically, if you have never made any adjustments to the valves, then this is a good place to start. Good luck with your diagnosis. Tom.

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A smoking lawn mower is never a good sign. Whether the smoke is blue, white, or black, here’s how to identity and address the issue without the help of a professional.

By Glenda Taylor and Bob Vila | Updated Sep 24, 2020 1:40 PM

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Q: Recently, my mower started billowing smoke when I powered it up, so I shut it off immediately. Why is my lawn mower smoking? And is it a fire hazard? I want to know how to proceed so I don’t harm the machine.

A: Your lawn mower can emit smoke for numerous reasons—many of which don’t require the services of an expert. A homeowner can usually identify the reason for a smoking lawn mower by gauging the color of the Cloud coming around the engine, then fix it accordingly before lasting damage occurs. Keep in mind that all mowers with internal combustion engines contain the same basic parts, but the configuration of those parts varies widely, depending on manufacturer and model. Consult your owner’s manual if you’re unsure how to access a specific part of your lawn mower’s engine.

White or blue smoke may indicate an oil spill on the engine.

If you’ve recently changed the oil in your mower and the engine is emitting white or blue smoke, it’s possible that some of the oil spilled onto the engine. Similarly, you could’ve spilled oil on the engine by mowing on a slope greater than 15 degrees or tipping the mower on its side. The smoke may look disconcerting, but it’s completely harmless. Solve the problem by restarting the mower and allowing the spilled oil to burn off. If you tip the mower often for cleaning or maintenance, check your owner’s manual to determine the best way to reduce the risk of oil leaks.

An overfull oil reservoir may also cause white or blue smoke.

Ensure you didn’t overfill the mower by checking the oil level with the dipstick located on the reservoir. To do this, remove the dipstick cap, wipe off the stick with a rag, and reinsert it into the reservoir. Then remove the dipstick once again and determine the oil level in comparison to the recommended “fill” line on the stick. If the level is too high, drain the oil (consult your owner’s manual for instructions), then refill the reservoir with it. Start checking the oil level with the dipstick after you’ve added about ¾ of the amount recommended in the manual. Continue to add small amounts of oil until the level matches the recommended “fill” line. Also note that using the wrong grade of engine oil may cause blue or white smoke. Consult the owner’s manual for the exact type of oil recommended for your mower.

Black smoke may indicate that the mower is “running rich,” or burning too much gasoline.

Your lawn mower’s carburetor regulates the ratio of gasoline to air mixture. If the carburetor isn’t getting enough air, the mixture has a higher percentage of gasoline, which can create black exhaust smoke. It’s possible that a dirty or clogged air filter is preventing sufficient airflow into the carburetor. Try replacing the air filter. (Note: air filters vary by mower model; view example air filter on Amazon.) Next, run your lawn mower for a few minutes. If the black smoke still appears, the carburetor might need to be adjusted in order to increase airflow. Either take the mower to a professional or adjust the carburetor yourself with instructions in your owner’s manual.

Take your mower to a repair shop if necessary.

If the previous steps don’t correct blue or white smoke, your mower could have a more serious problem, such as an air leak in the crankshaft (the cast iron or cast aluminum case that protects the moving parts of a mower’s engine). Continuing blue or white smoke could also indicate that some of the engine’s components or seals are worn out and need replacement. Similarly, if black smoking still persists after you’ve replaced the air filter and adjusted the carburetor, you could be facing a more serious mechanical issue. All of these problems require the help of a professional. If your mower is still under warranty, check with the manufacturer for the location of the nearest servicing dealer; problems stemming from a factory defect or poor workmanship may garner free repairs. If your mower is not covered under warranty, a reputable small-engine repair shop should also be sufficient to get the job done.

Why Does My Honda Lawn Mower Backfire?

This post may contain affiliate links. As an affiliate of retailers(like Amazon), we earn from qualifying purchases.

When it comes to lawn mowers, Honda is among the most popular brands in the business. Occasionally during use, you might find that your Honda lawn mower backfires. A backfire is a pop or loud boom that occurs when gasoline ignites outside the engine’s combustion chamber; so, what causes a Honda lawn mower to backfire?

A lawn mower backfires when burning fuel enters the exhaust or the engine. This happens when s of unspent gasoline enter the engine or exhaust system before the valves close. Backfires occur due to Rapid deceleration, faulty components, and even incorrect fuel blend, among other causes.

Want to know more about why your Honda lawn mower is backfiring? Read on as we discuss proven ways to fix a backfiring lawn mower.

Causes of Engine Backfires in Lawn Mowers

Below are some of the leading causes of backfiring in Honda lawn mowers.

Decelerating Too Fast

Lawn mower backfires mostly occur during Rapid deceleration when the engine attempts to align its timing with the lowered throttle. In most cases, this tends to lead to excessive air in the mix, which in turn creates a lean blend. The lean blend is consequently forced into the lawn mower’s exhaust system, where it makes the infamous pop sound when it combusts.

Slowing down a small engine should be gradual. Therefore, if your Honda lawn mower is backfiring when you’re looking to shut it off, chances are you’re decelerating too fast. The engine speed increases when using a lawn mower, and shutting it abruptly means the engine could pump some stray gas into the muffler, which could lead to combustion.

To prevent backfires when turning off your Honda lawn mower, reduce the mowing speed gradually, and allow the motor to idle for roughly 20 seconds before turning it off.

Fuel Blend

Fuel blend is a crucial aspect to consider when dealing with small engines. You’ll find that some gasoline contains ethanol or alcohol as part of the fuel blend, which can prove troublesome over time. Most Honda lawn mowers struggle to burn this blend effectively, which often results in power loss and occasional backfires.

Since lawn mowers are designed to handle specific blends of gasoline, using a wrong blend can lead to system imbalances. Due to this, it is advisable to use gas containing zero alcohol levels. If zero-alcohol blends are hard to come by, go for blends that contain low levels of alcohol.

Water Contamination

Water is another major cause of backfiring and loss of power in mowers. To remove water from your Honda lawn mower, you’ll need to start by removing the spark plug. Afterward, carefully remove the carburetor and clean it thoroughly. You should also check on the combustion chamber’s moisture levels before adding some fresh engine oil to coat the walls of the piston chamber.

The fastest lawnmower | 0.100mph in 6.285s!!!

Water contamination is a serious problem that, if not addressed early enough, can lead to long term damage to fuel lines, the tank, and carburetor.

Lean Carburetor

The carburetor is crucial to the functioning of a lawn mower as it regulates the volume of gas and air required for combustion. The balance must be perfect for proper combustion. While some Honda carburetors come with an electrical solenoid to control fuel flow, most come with two adjustment screws that are usually mounted on the exterior. One screw is for controlling the mix, while the other is for idle adjustments.

If the carburetor produces a lean mix, chances as the lawn mower will backfire during deceleration or even during normal operation. The good news is that carburetors are easily adjustable. However, consulting with a professional is advisable if it’s your first time attempting to adjust your Honda lawn mower’s carburetor.

Dysfunctional Valves

Valves are essential parts of a lawn mower that need to function correctly for successful outcomes. The valves help to seal off the firing chamber or cylinder of a small engine. One valve allows air and gas to make way to the cylinder while the other opens to allow the exit of exhaust gases from the cylinder.

Copyright protected content owner: and was initially posted on 2020-08-14.

If one of the valves malfunctions (even for a second), then the lawn mower will backfire. But fixing valves on your own isn’t recommended since they are internal parts of your Honda mower. Consider outsourcing the valve repair job to experienced service professionals.

Damaged Spark Plug

A damaged or worn out spark plug will create a weak spark that might fail to ignite the cylinder. This means that instead of igniting in the cylinder, the fuel might ignite once it reaches the exhaust muffler, which results in a backfire.

Also, an incorrectly set gap between the spark plug’s electrodes tends to result in weak sparks that make the mower unreliable. Replacing the spark is necessary if your Honda lawn mower is backfiring as a result of weak sparks.

Poor Airflow in the Engine Area

When the engine runs at a higher than normal temperature, your Honda lawn mower might gradually start to backfire. This explains why most lawn mowers require enough space in the engine housing to allow for adequate airflow.

Your engine needs enough air circulation for it to cool. Therefore, besides turning off the engine and allowing it to rest, you can consider modifying the engine’s housing to improve air circulation inside the mower.

Damage to Internal Components

Your Honda lawn mower shouldn’t backfire when starting, and if it does, then one or two components are not functioning correctly. You’ll find that a broken flywheel often leads to stuttering or backfiring when attempting to start a mower.

Luckily, the more sensitive areas of a lawn mower, such as the crankshaft, are usually surrounded by their inexpensive counterparts that cost a lot less to repair. Therefore, if your Honda lawn mower is backfiring when starting, you’ll need to call in a professional to identify and repair the damaged components.

How to Keep Your Honda Lawn Mower From Backfiring

Avoid Cutting Wet or Damp Grass

Mowing the lawn when the grass is wet or damp can damage your mower, consequently leading to long term problems. As mentioned earlier, you should remove water once you suspect either the tank or carburetor has been contaminated.

Read the User Manual Before Use

Lawn mowers function differently. Take enough time to read the instructions before putting your new Honda lawn mower to good use. Generalizing the function of different brands of lawn mowers can lead to backfiring or malfunctioning when wrongly used.

Clear Debris Before Mowing

Large stones, toys, twigs, and branches might damage your Honda lawn mower. Although most mowers come with adequate safety-enhancing features, exposing them to extra hard surfaces and conditions might lead to backfiring and even total damage.

Copyright article owner is for this article. This post was first published on 2020-08-14.

Check the Fuel Blend

Gasoline with high alcohol concentration is more likely to lead to backfiring compared to using pure gasoline. Go for fuels with little to no alcohol concentrations to eliminate the chances of backfiring due to fuel.

Final Thoughts

While it’s normal for lawn mowers to backfire every once in a while, you should always take your time to determine the cause of backfiring. Factors such as fuel blend and water contamination can gradually damage your yard-maintenance device, leading to serious defects.

Although backfires aren’t dangerous to the engine or users, the large pop noises can be annoying. And to prevent a backfire when you’re done mowing, be sure to turn off the mower gradually, specifically 15-20 seconds after the blades have come to a halt.

Remember, since backfires tend to indicate underlying issues with your mower, you should consider reaching out to an expert if you can’t determine the cause(s) of backfires.

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ReadyToDIY is the owner of this article. This post was published on 2020-08-14.

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