Lawn mower carburetor assembly. How to Clean a Craftsman Lawn Mower Carburetor: Step-By-Step

Where is the Carburetor on a Lawn Mower? (Every Mower)

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I’ve always enjoyed using my cordless walk-behind push mower – no pesky cord to haul around and no gas to fill in the tank. But when I need a surge of power to complete larger jobs with ease, my go-to choice undoubtedly is my robust 140cc Briggs Stratton gas push lawn mower.

The downside however of using a gas-powered lawn mower is maintaining the many different parts like the air filter, spark plugs, hoses, and several other parts under the hood including the lawn mower carburetor.

lawn, mower, carburetor, assembly

Of all these aforementioned parts, the lawnmower carburetor is often the most overlooked but is in fact one of the most important parts of a mower just like a lawn mower engine that requires a fair bit of maintenance including annual maintenance.

What is a LawnMower Carburetor?

All gasoline-powered lawnmower engines are fitted with a carburetor. Similar to your car or truck engine, a carburetor helps run the small engine of a push lawn mower, self-propelled lawnmower, or riding lawnmower.

What Does a Lawnmower Carburetor Do?

The only goal of a lawnmower carburetor is to ensure that the right mixture of fuel and air enters the engine cylinder to trigger combustion.

This component of a lawnmower adjusts the balance of air and fuel based on myriad different factors including the amount of time the engine has been running, your speed, and the type of terrain you’re mowing.

Unlike automobile systems, a carburetor of a lawnmower doesn’t contain any throttle butterflies (a pivoting flat valve controlled by the gas pedal) but contains a rubber-type push bulb, through which fuel is primed when the bulb is depressed several times on a push-type lawnmower.

The fuel from the fuel tank flows through the bulb via a hose into the carburetor, which typically allows gas to drip into the carburetor bowl.

The engine creates a suction on the carburetor which mixes the gasoline with air at a specific ratio. After the carburetor has been primed, you can use the pull rope to start the engine.

What Does a Lawnmower Carburetor Look Like?

Most lawnmower carburetors look similar, with a small metal component complete with levers and springs and a distinct bowl shape under the carburetor body.

The carburetor float bowl accommodates the fuel and provides a continuous supply of fuel to the carburetor mixture as required.

The float bowl of a lawnmower carburetor can be drained with either the onsite drain bolt or screw without dismantling the whole system.

Where is the Carburetor on a Lawnmower?

This depends on the type of lawnmower you’re using, whether push, self-propelled, or riding lawnmower.

Where is the Carburetor on a Push Lawnmower?

Just as the name suggests, a push mower is any type of mower that you walk behind and push. The carburetor of a push mower is tucked away neatly behind the air filter at the side of the machine.

If you can locate the air intake filter or air filter of a push lawn mower, you’re one step closer to finding its carburetor. Depending on the machine, the air filter of a push mower is typically encased within a metal or plastic shroud and secured by a screw or with snap fittings.

Where is the Carburetor on a Riding Lawnmower?

The carburetor of a riding lawnmower is located just beneath the hood under the engine blower assembly so you’ll have to undo the hood latches of the engine hood to access it.

Similar to walk-behind mowers, the carburetor of a riding lawnmower is located behind or below the air filter, so once you remove the filter, you can spot it easily.

Signs a Lawnmower Carburetor is Dirty or Damaged

Old Gasoline

Old gasoline is the biggest enemy of a lawnmower carburetor regardless of the type of engine whether Briggs Stratton or brands including John Deere.

Your lawnmower will still run on old gasoline but it won’t offer the same top-notch performance that you’re used to.

This is why it’s highly important to empty the lawnmower gas tank when storing the machine for the off-season because old gasoline creates what is known as shellac in the fuel system.

This shellac blocks the inner workings and the air and fuel jets in the carburetor, which further prevents the fuel and air from passing through it.

A clogged gas line can be detrimental to the entire fuel system including the fuel filter, and mower air filter, and may even emit black smoke, which indicates that the machine is “running rich,” or burning too much gasoline.

The only solution for a gummed-up carburetor is a thorough cleaning, which involves removing the carburetor – a task you can do at home rather than visiting a lawn mower engine repair shop.

How to Get Rid of Old Gas in Lawnmower?

Before getting rid of the old gasoline from the lawnmower, check to see if it’s contaminated by pouring some in a glass container, pouring some fresh gasoline in another container, and then comparing them alongside.

If the old gasoline is darker or has a sour smell than the fresh gas, it is probably losing or has lost its efficacy.

Ideally, it’s best to get rid of the old gasoline from the lawnmower completely, but you can try diluting it with fresh gasoline to see if the performance improves.

You can transfer the old gasoline from the machine with a funnel into a jerry can or plastic can jug.

Engine Won’t Start

There could be several reasons why your lawnmower engine won’t start, most notably a dirty air filter, loose, dirty, or disconnected spark plug, and/or fuel not reaching the engine, which may be caused by a faulty carburetor or fuel filter.

lawn, mower, carburetor, assembly

If you’ve cleaned the air filter and checked that the spark plug and spark plug cable are connected securely, and you’re still facing the issue, making a few adjustments to the carburetor may help.

There may be many issues with the carburetor such as it’s dirty, the diaphragm is cracked or distorted, and/or it’s simply not getting the proper mixture of air and gasoline.

Your lawnmower’s carburetor and engine are protected against debris, dirt, and grass clippings by air filter guards. It is always a good idea to ensure they are clean and in perfect working condition:

  • Check and clean the air filters and reinstall them in the machine.
  • Next take a look at the vented fuel cap, which is designed to release pressure, allowing fuel to flow from the tank to the carburetor. Remove the gas cap to break the vacuum, then reattach it to see if this resolves the issue.

Engine Hunts at Idle or High-Speed

If your mower revs erratically, also dubbed as hunting or surging, the most likely cause is an incorrectly adjusted carburetor.

lawn, mower, carburetor, assembly

The good news is that most lawnmowers including John Deere have two screws that allow you to make adjustments to the carburetor yourself.

One screw adjusts the idle mixture while the other controls the idle speed. Since every lawnmower is different, refer to your owner’s manual for the location of the idle adjustment screws, start the mower and allow it to run for roughly 5 minutes, and make the screws looser or tighter until the machine runs and idles smoothly.

Lawn Mower Leaking Gas

A lawn mower leaking gas could mean several maintenance issues such as an open carburetor cover, carburetor housing, or carburetor float.

Another reason for carburetor fuel overflow is a stuck carburetor float, which is engineered to regulate the flow of fuel into the carburetor bowl through a simple mechanism.

There are a few potential fixes for this issue including adding a carburetor cleaner to your fuel, tapping the carburetor bowl light with the rear end of a screwdriver, and blowing compressed air through the carburetor bowl drain hole.

Engine Lacks Power at High Speed

Apart from old, bad fuel, another reason why the engine of your lawnmower may lack power at high speed is a dirty carburetor. In most cases, cleaning your lawnmower’s carburetor should resolve the issue.

How to Clean Lawn Mower Carburetor?

Experts say that you should check and clean your lawnmower’s carburetor at least a few times a year. The reason for this is simple – as you use your mower, grass, twigs, and other debris can make their way into the lawnmower’s carburetor, and eventually into the engine.

However, your carburetor will suffer breathing issues if the air filter is dirty, so the first thing to do is check the air filter to ensure it is free from any dirt and debris.

How to Find Your Lawmmower’s Carburetor?

Since every lawnmower isn’t built the same, the best way to find your mower’s carburetor is by referring to the user guide that came along with the machine. But here are a few simple steps to locate the carburetor of your lawnmower.

Before getting started, it’s important to ensure that the mower is in a stable position and safe location and will not roll off.

  • Place the mower on a flat surface and make sure it is turned off completely. If you’re trying to locate the carburetor of a riding lawnmower, set it in a gear or engage the parking brake just like you would when parking a vehicle on a slope.
  • Next, release anything that is making the mower’s internal components inaccessible such as hood latches. Most, if not all push lawn mowers don’t have a hood so can skip this step. This step applies to riding lawnmowers.
  • Locate the air intake and the air filter, which are usually found on the side or top of the engine. The air intake and filter are set within a housing, which is either square or round shaped and has slits or holes in the top.
  • Detach the filter housing which is attached to the carburetor via latches or screws.
  • Locate the fuel line that comes from the gas tank to the carburetor. Undo the small clamp to detach the fuel line from the carburetor.

How to Remove a Lawnmower Carburetor?

To clean a lawnmower carburetor, you’ll have to completely remove it from the machine. You can usually do so with tools such as an adjustable wrench and/or a pair of needle-nose pliers. You may have to remove the engine cover as well depending on your lawn mower model.

  • Turn off the fuel valve or make a crimp in the fuel line, and remove it from the carburetor. A little fuel may spill out at this time so you should dress appropriately for the job.
  • Detach the choke and throttle linkages from the carburetor throttle lever, and remove the carburetor from the mounting bolts using a sliding motion.
  • Unthread the screw to remove the carburetor bowl.
  • Release the float pin and carburetor inlet needle.

How to Clean a Lawnmower Carburetor?

Once you’ve removed the carburetor from the lawnmower, you can use a carburetor cleaner to remove grime and fuel, and a dry rag to clean the external parts of the carburetor.

If you notice any signs of rust, get rid of them with sandpaper or a rust remover. Allow all the parts to dry and reinstall them and the carburetor back on the lawn mower.

If your carburetor is showing signs of physical damage, you may have to replace it with a new one instead of reinstalling the old one back on the machine.

How to Clean Lawn Mower Air Filter?

If you keep your lawnmower’s air filter clean, you will have less dirt and debris getting into the carburetor.

Your lawn mower’s air filter is in fact the first line of defense against dirt and debris that stems from the mowing process and prevents dirt from entering the engine via the carburetor.

It’s a good practice to clean your lawn mower’s air filter every 25 working hours or whenever you notice a dip in performance. Replace the air filter if damaged or after 300 hours of operation.

  • Shut down the mower before getting started with the cleaning process, and make sure all the parts have come to a complete stop and have cooled down. Note: You should never operate a mower without an air filter as doing so will cause serious damage to the machine and yourself.
  • Disconnect the spark plug wire and remove the protective screw that secures the mower’s shroud (covering) over the air filter. The exact location of the air filter could vary by model but most commonly is located near the top of the engine, and is protected by a shroud.
  • Remove the air filter and take a closer look at it. Your lawnmower could be fitted with one of three different types of air filters:
  • Foam air filter
  • Paper air filter
  • Dual-element air filter.

If you have a paper air filter, gently tap it on a flat surface to knock off any loose dirt and debris. Next, hold it up to a bright light source and if the paper blocks a considerable amount of light, then it’s time to replace it but don’t try and clean it further.

A foam lawn mower air filter should be replaced if there are any signs of crumbling or visible brown or yellow staining. If it’s in good condition, you can go ahead and clean it.

For a hybrid air filter, refer to the manufacturers cleaning guidelines. But usually needs to be replaced if it’s become stiff, brittle, or significantly stained.

Cleaning a Lawnmower’s Foam Air Filter:

  • Washing: You can wash your lawnmower’s foam filter in the wash sink or with a garden hose to get rid of stubborn dirt. If it’s extremely dirty, use dish detergent to remove the dirt but be sure to rinse the soap out thoroughly.
  • Drying: Let the filter air dry under the sun, after which you can oil it. You can apply oil with your hands or directly pour it over the foam filter. But don’t get carried away as you don’t want the oil dripping into the mower.
  • Re-installing: Before reinstalling the air filter, clean the housing and the shroud with a dry cloth and not with a compressor because it could force dirt and debris into the carburetor and engine. Reinsert the air filter and make sure it fits snuggly into its dedicated slot. Lastly, replace the shroud but be careful not to tear the filter. Don’t forget to reconnect the spark plug, so you can start your lawnmower.

How to Perform Lawn Mower Maintenance?

Maintaining your lawn mower will improve both its performance and service life. Lawnmower maintenance can be carried out at any time of year but the two best times are before the first mow of the season and at the end of the season when it’s time to retire the mower.

Many people choose to take their mower to a professional repair shop for maintenance but these simple checks and fixes can be performed in the comfort of your home.

Since every lawnmower model is different than the other, it’s best to refer to your owner’s manual for maintenance instructions but here are some common tips to keep your mower in tip-top shape.

Replace the spark plug

Removing the spark plug ensures that the mower doesn’t accidentally start. A lawnmower spark plug should be changed every mowing season, after 25 hours of use, or if the mower won’t start.

  • Start by disconnecting the spark plug lead.
  • Clean the area to prevent any debris from seeping into the combustion chamber when you remove the plug.
  • Use an appropriate spark plug socket to remove the spark plug.
  • If there are any light deposits on the plug, clean them with a soft cloth.
  • Replace the plug if there are any damaged electrodes.

Change the oil

You should ideally change the oil in your mower every 50 hours of operation or after every mowing season. Most mowers come with a drain plug that allows you to drain the oil from the mower. If your mower didn’t come with a drain plug, simply flip the mower over on its side and allow it to drain via its fill hole.

Make sure to replace the oil with the right type of lawnmower oil, but 10W30 is the grade suitable for most lawnmowers.

Drain the fuel tank

If your lawnmower won’t start, the common culprit is old gas. Lawnmower gas can go stale and lose its volatility in as little as 30 days and leaving gas in the tank when not in use can eventually corrode the fuel tank.

Remember to drain the fuel tank at the end of each season and refill it in the spring, and take all the necessary precautions while performing this task.

Clean the mowing deck

The mowing deck is perhaps the most used component of a mower but is also the most overlooked when it comes to cleaning and maintenance.

It’s a good practice to clean the mowing deck every time you finish cutting the lawn. Dirt, cut grass, and debris can accumulate onto the area above the blades, aka the mowing deck, and once it dries, becomes incredibly hard and difficult to remove.

You should perform a thorough mower deck cleaning at the end of the growing season, which entails removing the spark plug and cleaning the mowing deck and blades thoroughly.

Check the tires

Regardless of the type of mower, whether walk-behind mowers or riding lawn mowers, it’s important to check the tires to ensure they’re in good condition and are free from chips and damage.

Here’s an informative video on how to remove a lawnmower carburetor and the steps to maintain and repair a lawn mower:

How to Clean a Craftsman Lawn Mower Carburetor: Step-By-Step

It’s not unusual for a carburetor to stop functioning correctly because it has gummed up causing the fuel jet to become clogged or the float to become stuck.

Old fuel can be the main cause of a carburetor not working. Making sure you’re running the right gas through your Craftsman mower and only using fresh gas will help minimize the negative effects on the carburetor.

Symptoms of a Bad Craftsman Mower Carburetor

When your carburetor is acting up, it is no longer able to correctly regulate the fuel-to-air mixture required by your Craftsman’s engine. You could experience these symptoms:

  • Mower won’t start
  • Engine backfires from running lean
  • Engine sputters and runs rough
  • Engine surges
  • Consumes too much fuel

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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.

Steps to Clean a Craftsman Lawn Mower Carburetor

If you have a fuel system problem and have confirmed you are getting a good supply of fuel to the carburetor, perform one more step to confirm you need to disassemble and clean your carburetor.

Remove the air filter from the air filter housing. Spray carburetor cleaner into the air intake and start your Craftsman mower. If your mower starts, runs, and then dies, you should disassemble your carburetor and clean it.

Gather Tools Supplies

  • Pliers
  • Screwdriver
  • Socket/ratchet set
  • Carburetor Cleaner
  • Thick wire
  • Needle nose pliers

Take Photos

Most people have a cell phone available nearby. It probably has a camera on it making photo-taking a quick easy process. If you have one of these, you should use it to document steps.

Even if you have a great memory, I highly recommend you take multiple photos of your carburetor before and during the tear-down process.

You will be working with many small parts. It will be good to have photos to reference to make sure you put your carburetor back together the correct way. You’re better off taking these photos and not needing them over not having photos at all.

Shut off the Fuel Supply

Stop the fuel flow on your Craftsman lawn mower. Use the fuel shut-off valve located on the bottom of your fuel tank. If you don’t have a valve on your mower, crimp the fuel line.

Remove the Throttle Choke Cable

Detach the throttle and choke cables from your carburetor.

Remove the Air Filter Housing

Remove the hardware that attaches the carburetor to the air filter housing so it is detached.

Remove the Craftsman Mower Carburetor

Slowly remove the springs from the carburetor. Do not stretch the springs or you’ll have to replace them. You may have to twist the carburetor a bit to get the springs to come off the carb.

Be careful not to rip the gasket between the engine block and the carburetor or you will have to replace it with a new gasket.

Remove the Carburetor Bowl

Now locate the bowl on the bottom of your carburetor. This is the place a small amount of fuel is collected once it leaves the fuel tank. Have a rag available to soak up any remaining fuel in the bowl.

lawn, mower, carburetor, assembly

Remove the screw located at the bottom of the bowl and lower the bowl to remove it from the carburetor. You will find a gasket located around the bowl. It looks like a rubber Band.

Do not get any carburetor cleaner or other substance on the gasket as it will ruin it. If you do, the gasket must be replaced before the bowl is reattached.

Check the Stem for Clogged Holes

You will find a stem that hangs down in the center of your Craftsman’s carburetor. The holes in the stem can become clogged with the gumming of old fuel. With a flashlight to better see the holes, use a thick wire to unclog them.

Remove White Crusty Buildup and Gumming

Check the other component in your carburetor along with the carburetor itself for additional gumming and a white crusty buildup.

Remove the gummy deposits along with as much of the crusty material as possible using a carburetor cleaner. Note: It is almost impossible to remove all the crusty material.

Reassemble the Carburetor

Once you have finished cleaning the carburetor in your Craftsman lawn mower and ensured all the components are in good working order including your float needle and float, go ahead and reassemble the carburetor.

Reverse the steps you went through when you removed your carburetor. Use the photos you took earlier for reference.

Add Fresh Fuel Allow It to Fill the Fuel Bowl

Make sure you aren’t running old fuel through your Craftsman or you may soon run into the same problems with your carburetor. Use the right type of fuel and allow your fuel bowl to fill with fuel.

Replace or Rebuild Your Craftsman Carburetor When Cleaning is Unsuccessful

Sometimes cleaning your carburetor doesn’t make it carburetor function correctly. You may have small components in your carburetor that must be replaced or old fuel has caused so much damage you need to replace the carburetor.

Rebuild or replace your carburetor. You will need to have your engine model and spec available to ensure you order the correct part(s). Craftsman uses other manufacturers’ small engines in their mowers.

You can order a replacement carburetor or rebuild kit online, at your local Craftsman dealership, or at an authorized engine dealership.

Fill Your Fuel Tank with Fresh Gas and a Fuel Additive

Run a good supply of fresh gasoline through your gas-powered Craftsman lawn mower. Don’t let it sit in your mower for long periods of time. Use a fuel additive to stabilize like Sea Foam Motor Treatment in your fuel to minimize future fuel issues.

Read more about using Sea Foam as a fuel stabilizer and why it is what I use in my lawn mower.

Cleaning Your Craftsman Carburetor Didn’t Solve Your Problem

If cleaning your carburetor didn’t solve your problem and you still have problems in your fuel system. Check out my article, This is Why Your Craftsman Lawn Mower Isn’t Getting Fuel.

If you aren’t sure it is a fuel system problem, I have put together a list of common Craftsman mower problems and solutions where I address starting, fuel system, smoking, overheating, cutting problems, and more. You can find it at Common Craftsman Lawn Mower Problems.

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How to Clean a Lawn Mower Carburetor

It’s 9:00 AM on a beautiful Saturday morning this summer. Your daughter has a soccer game at 11:00 AM and you are ready to get a little lawn mowing done before the game.

You pop open the garage door, head on over to your lawn mower, and give the pull string a swift tug to fire it up. And. nothing happens!

We feel your pain because we have been there too. There is a really good chance you need to clean your mower’s carburetor before it will ever start again.

We are going to get you familiar with carburetors and teach you how to clean them in this iGoPro Blog Post.

Introduction to Carburetors

A lawn mower is an essential tool for maintaining a beautiful lawn. Like any piece of lawn equipment, it must be properly maintained to ensure it does not fail while in use.

Battery-powered mowers are gaining popularity, but the majority of lawn mowers still run on gas engines which means they have a carburetor.

Gas engine mower’s runs by gas mixing with air and being ignited by a spark like other combustion engines. Air passes through an air filter in the carburetor and mixing with the fuel before the spark plug ignites the gas/air mix.

The purpose of a lawn mower air filter is to prevent dust and dirt from clogging up in the carburetor and engine. Most fuel lines also have a filter, in this case, a fuel filter, to keep any debris in the gas from entering and damaging the engine’s internal parts. Even if the debris in your engine doesn’t immediately cause noticeable problems, the result is energy loss and increased gas consumption.

The carburetor is one of the most essential components of a lawn mower. The carburetor ensures the proper mix-up of gasoline and air in the engine to keep the engine running properly.

The Importance of Keeping Your Mower’s Carburetor Clean

Cleaning your carburetor ensures it will continue to work properly. If not, its ability to regulate combustion will be seriously compromised. Air should flow into the carburetor, mix with the gas, and start the engine.

Everyone knows lawn mowers cut grass. When the blades are actively engaged, the engine is put under more stress and this is when it is even more imperative that your lawn mower carburetor is clean. Over the years we have run into situations where the engine operates as expected until put under the additional stress of having the blades engaged.

Therefore, regular maintenance of the engine is necessary. First, check if your mower is working properly and clean it. As there are different models of engines, when disassembling, you should look carefully or always refer to the assembly manual and take pictures as you go.

Make sure the fuel line is shut off before removing the carburetor. Most have a knob you can turn to shut off the flow of fuel through the line to the carburetor. If yours does not, you can pinch the line to temporarily cease the flow of fuel.

Craftsman 6.5 Briggs Mower Carburetor Replacement

After removing the carburetor, clean it thoroughly so that its floating valve can move freely. Then replace the carburetor and open the fuel line back up.

Items Needed to Clean a Carburetor

You will need a handful of items you can find at any auto parts store to clean the carburetor on your lawn mower.

Carburetor Cleaning Material List:

  • Carb Cleaner
  • Shop Towels
  • Oil
  • Screwdriver
  • Ratchet Sockets
  • Pressurized Air is Recommended
  • Possibly a Carbuteror Repair Kit for your Specific Carburetor

Steps for Cleaning the lawnmower carburetor

Cleaning a lawn mower carburetor is something anyone that is slightly mechanically inclined can do on their own. It is important to pay attention as you disassemble the carburetor so you know how to reassemble it! Once again, we recommend you take many pictures to document the disassembly to assist with reassembly.

Here are the steps to clean your air filter carburetor:

The first step to cleaning carburetor is to remove it from the engine. Once you have done this, disassemble, clean it, and maintain it. Make sure you have shut off the flow of fuel prior to removing the carburetor.

  • Prepare to Remove the Carburetor From Your Lawn Mower: Remove the spark plug by pulling on the spark plug wire to disconnect. Shut off the flow of fuel to the carburetor by turning the shut-off valve or pinching the line. Then identify the bolts or screws attaching your carburetor to your mower’s engine and remove them. Sometimes you will need to remove or loosen additional engine components to fully remove the carburetor.
  • Remove the cap screws holding the carburetor from the engine and be very careful not to damage the diaphragm between them.
  • Carefully remove the rubber gasket from your carburetor. If you don’t see it, it may be stuck to the engine. You don’t want carb cleaner touching your gasket as it can corrode it. If your gasket is damaged at all, it must be replaced with a new gasket before reinstalling or fuel will leak.
  • Remove the bowl, metal bulb from the bottom of the carburetor using your tools. Clean it with an aerosol cleaner and a clean shop towel.
  • Remove the 0 ring that sticks to the bottom of the bowl. Check for cracks or wear, replace, and set aside.
  • Get a carb cleaner, or carburetor cleaner, then inject the fluid into each port and make sure it comes out at the other end of the port. These ports are very narrow and easily clog. That is why the air filter and fuel filter are so important!
  • If you are not noticing the carb cleaner successfully traveling through the ports, try using compressed air with a needle tip air gun to blast out any blockage. If that doesn’t work, try soaking the carburetor in carb cleaner and trying again hours or days later if needed.
  • Reassemble any internal parts of the carburetor you may have removed in the process. Once complete you can start reattaching the carburetor to your engine.
  • It is recommended to put a small amount of oil on the gasket before sealing it back to the engine when tightening the bolts that connect it.
  • Turn your fuel line back on.

Pro Tips For Cleaning Carburetors

You’ve just learned about the importance of the air filter and fuel filter. They are probably the reason you needed to clean your carburetor in the first place! Why not replace these inexpensive items while you are working on your carburetor?

Do not use wire brushes or thin pieces of wire to clean a carburetor. Carburetors are calibrated to achieve the perfect air to fuel mix and must be 100% sealed. Using any type of hard material to clean a carburetor is a great way to compromise your carburetor.

Additional Lawn Mower Maintenance Tips

  • Use only fresh fuel for your lawn mower. Old or stale gasoline will thicken and reduce flow to the carburetor. This is actually one of the problems that keep your mower from starting.
  • Check the oil level regularly and change the oil at least once a year or per your mower manufacturer’s recommendations. Dirty oil is another great way to ruin an engine quickly.
  • Make sure your lawnmower blades are kept sharp as dull blades will tear your grass instead of cutting it. Learn more about sharpening mower blades.
  • Check the mower’s spark plug at least once a year. If it is dirty, you can clean it or replace it.
  • Make sure your lawnmower wheels are inflated, rotating freely, and haven’t been damaged.
  • After each use, clean the bottom of the mower to remove accumulated grass. If grass collects under your mower’s deck, you will notice a dramatic drop in ‘cut quality.’ The space above your mower‘s blades under the deck most remain open for the blades to create lift and provide a flush cut of the turf.
  • Check wires, wire connections, belts, and lines on your mower to ensure they are fully connected, not pinched, and have not been cut or melted.
  • Always prepare your lawnmower correctly for winter, even if it will only be out of use for a month. To do this, siphon the fuel out of the gas tank and run the engine until it completely drains the carburetor of fuel.

By ensuring that your lawnmower is in good condition, you will be rewarded with several years of exceptional use. Follow the maintenance tips above on a regular basis to ensure that the mower always starts on the first start and mows the lawn as you would expect.


Proper care of your lawn mower parts will keep them in top shape, and most importantly, reliable and safe. There is nothing more frustrating than going to mow the lawn to realize your lawn mower will not start. If this happens you to, we hope this article helps and remember, there is a good chance it has something to do with your carburetor.

Ryan Sciamanna

Ryan is the owner and founder of Lawn Crack, LLC the parent company of iGoPro Lawn Supply. He has worked in almost every capacity within the lawn and landscape industry for small local companies, nationwide companies, and of course, owning his own lawn landscape business which he sold in 2018 before starting selling lawn and garden products online. Learn more about Ryan by subscribing to the LawnCrack YouTube Channel.

Understanding the Briggs and Stratton Carburetor Diagram

The carburetor, which powers lawnmowers, is a crucial part of tiny engines. It is critical to comprehend how Briggs and Stratton carburetors function in order to maximize engine performance.

The Briggs and Stratton carburetor’s core parts will be discussed in this post. Also, a thorough schematic will be shown that reveals all the parts that make up this crucial engine component.

This in-depth analysis of the Briggs and Stratton carburetor will assist you in troubleshooting problems and improving overall performance.

Location and Application of Important Briggs and Stratton Carburetor Parts (Included)

The Briggs and Stratton Carburetor needs some parts to work properly. The Carburetor’s location is depicted below, along with a short description of each component:

Gasket Intakes

The gaskets intakes (51, 51A) are an essential part of the carburetor assembly. These act as seals between the intake manifold and the carburetor. Air leaks are stopped by these gaskets.

Additionally, they guarantee that the engine gets the right air-fuel ratio for combustion. These gaskets are made of high-quality materials like rubber. The gaskets control the engine’s air intake as a result. They cost 3.55.


Metal rods with threads called studs (53) are used to fix and place parts inside the carburetor assembly. The vibrations and strains that occur during engine operation are intended to be tolerated by these studs.

Usually, they are constructed from strong materials like steel or brass. Stable connections between various carburetor components are made possible via studs.

Additionally, they guarantee perfect alignment and stop undesired movement. The studs cost 5.71.

Pin Float Hinge

A relatively small but crucial component of the carburetor’s float system is the pin float hinge (104B). The float can gently rotate thanks to this hinge. It controls the amount of fuel in the carburetor bowl.

It is made up of a pin that serves as the hinge. The pin float makes it possible for the float to oscillate in reaction to fuel levels. A continuous fuel flow to the engine is ensured by the pin float hinge’s good operation.

Furthermore, it avoids floods or a fuel shortage. It costs 3.99.

Main Jet

The main jet (standard – 117, high altitude – 118), a properly regulated aperture, regulates the volume of fuel entering the mixing chamber of the carburetor.

The fuel to air ratio may be adjusted to perfection to enhance engine performance under circumstances. fuel may enter the chamber due to the bigger primary jet.

Additionally, it improves the combination for conditions of high demand. A smaller jet, however, inhibits fuel flow for leaner mixes when the load is lower. The main jets cost 15.54 and 7.55.

Carburetor Overhaul Kit

A kit for overhauling a carburetor is made up of various gaskets and other parts. These kits frequently include components like pin float hinges, gasket air filters, and intake gaskets. Carburetors may clog or wear out over time. Performance and fuel economy suffer as a result. You may get the carburetor back to working properly by using a carburetor overhaul kit (121B). It costs 35.63.


The spacer (122) is a part that is positioned between the intake manifold and the carburetor. The distance between the carburetor and the engine is widened. As a result, it enhances fuel atomization and airflow.

A carburetor spacer can also serve as a heat insulator. It lessens the engine’s ability to transmit heat to the carburetor. Vapor lock and fuel percolation problems may be avoided as a result. It costs 10.57.


The most important part is the carburetor (125A). It is in charge of combining the fuel and air for combustion. It comprises of the main jets, gasket air cleaner, drain carburetor bowl, and gasket intakes.

The float mechanism controls the fuel level while the bowl stores fuel. The amount of air entering the engine is managed by the throttle valve. Fuel is drawn into the vacuum by the components. The price is 52.91.

Air Cleaner Gasket

The air cleaner gasket (163) is a seal that makes sure the air cleaner assembly and the carburetor are tightly connected. The carburetor cannot get unfiltered air thanks to this gasket.

It shields the engine from dangerous pollutants and debris. It is constructed of sturdy materials like foam or rubber. Effective barriers against dust and other particles are provided by the materials. It costs 4.74.

Drain Carburetor Bowl

At the base of the carburetor float bowl is a little stopper or valve known as the drain carburetor bowl (254). It offers a practical way to empty the bowl and get rid of any water or stale fuel that has collected.

The carburetor bowl should be drained to avoid blockages. Additionally, it enhances fuel purity and guarantees efficient engine operation. It costs 3.55.


The carburetor assembly’s numerous parts are fastened together using nuts (654). Studs and bolts are fastened together by nuts. Each of these costs 2.58.

Lever Choke

The lever choke (951) is a device that regulates the carburetor’s choke plate’s opening and closing. When an engine starts, the choke plate limits airflow. The air-fuel combination is enriched for simpler cold starting.

The operator may manually adjust the choke’s position using the lever choke. Additionally, it modifies the mixture to fit various starting and operating circumstances. It costs 9.06.

What are Some Symptoms of Damaged Briggs and Stratton Carburetor?

A Briggs Stratton mower’s broken carburetor can cause a variety of performance problems. Here are some typical signs of a carburetor issue that might include:

Carburetor Cleaning

  • An incorrect fuel-air mixture might be the result of a broken carburetor. It may take a long time to start the engine or it may not start at all.
  • The engine may idle unevenly or harshly due to a carburetor malfunction. At idle, the engine can spike rather than operate smoothly and regularly.
  • Fuel supply may become erratic if the carburetor is damaged. It will affect the engine’s overall performance or power output.
  • The engine could have trouble reaching its typical RPM range.
  • When the engine is under load or accelerating, it might cause it to stall or hesitate.
  • Excessive fuel usage may result from a broken carburetor.
  • It may result in the engine producing deposits of black soot on the spark plugs.
  • Fuel leaks might be present in a carburetor with broken seals, gaskets, or other parts.

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