Husqvarna mower carburetor adjustment. How to Adjust a Carburetor to a Husqvarna 125r Trimmer

How to Adjust a Carburetor to a Husqvarna 125r Trimmer

Self-adjusting carburetor lawn mowers do it yourself impossible without preliminary work, knowledge of the theory, awareness of the fuel system. Carburetor repair annotation.

Do-it-yourself carburetor adjustment for lawn mowing

Lawn mowers, like all gasoline powered tools for the garden, are not difficult to maintain. It is possible and necessary to repair, configure without the help of others. For example, carburetor adjustment lawn mowing hands. A matter of 5 minutes.

Lawn mowing carburetor is a unit in the power system. In it, like all carburetors, there is a process of mixing air and fuel (gasoline) for the upcoming supply to the engine cylinders.

The main thing in this process is the correct proportion of fuel and air, which is why the carburetor is regulated.

The main problems and malfunctions of the carburetor.

Strainer There are only two tasks with this element:

In order to find out the cause of the breakdown, the fuel filter cover is unscrewed to remove the strainer. If it just accumulated dirt, then washing with gasoline or blowing will help.

With visible damage to the strainer, it is imperative to install a new one. There may also be damage on the fuel supply pipe (during repair, check this element).

The carburetor starting device almost always does not work due to blockages. Use acetone or the same gasoline for flushing.

Blowing off carburetor parts with a blockage of compressed air is an acceptable and comfortable repair practice.

The throttle body, the bundles of carburetor parts, the intake or exhaust pipe. All of these parts are subject to depressurization. Probably you can check with a simple method. Smear the problem area with soap suds.

The device of the carburetor lawn mowers

The diffuser is equipped with fuel channels. Fuel is drawn from them by an air stream.

Outside the carburetor is installed:

Husqvarna 125R carburetor tuning without tachometer (temporary solution)

How to adjust carburetor,if you need to work, and the service with a tachometer is far away.

Principle of operation carburetor lawn mowers

The throttle valve determines the amount of air for supply, and engine power directly depends on this.

Fuel is sucked into the carburetor system by a pump (its membrane). Then it passes through the fitting in the carburetor. Further, the fluid moves through the inlet and outlet valves of the pump. Filtered by mesh. The needle valve moves into the membrane chamber.

Phased operation of the device:

  • Air supply to the tube with an air baffle (damper). The partition controls the intensity of the air flow.
  • The fuel supply system must be narrowed by a diffuser to increase the flow rate.
  • Gasoline through the float chamber and nozzle tube with narrowing. A camera with a float adjusts the temporary volume of gasoline. In the float chamber, the pressure level is neutral, and in the tube with narrowing is already low. Due to the pressure drop, fuel enters through the nozzle.
  • The acceleration of the air flow contributes to the transfer of fuel (gasoline) and its atomization. As a result, an air-fuel mixture of the necessary proportion or density is formed.
  • The air-fuel mixture enters the engine cylinder through the fuel pipe.

The level of air density in the system depends on the area of ​​the open air damper. The wider the flap is open, the greater the fuel consumption and power.

Simply put, adjusting the carburetor on the lawn mower is creating the optimal fuel mixture due to the correct air supply.

How to adjust a carburetor on a lawn mower

Further carb adjustment do-it-yourself lawn mowers performed by adjusting screws. There are three of them:

Right (L). Adjustment of the fuel mixture for low revs.

Need to find the maximum idle speed. To do this, slowly turn the screw (L) to the right and left.

To adjust, turn the screw a quarter of a turn necessarily counterclockwise.

Bottom (T). Is responsible for adjusting the engine at idle.

For proper adjustment of idling, it is typical:

  • Steady work of the cold engine;
  • Not overestimated speed of the hot engine;
  • A large headroom for the trimmer head;
  • Stable operation of the engine when changing position (sharp rise or descent of the knife).

Left (N). Adjustment of the mixture at high speeds. (The screw is configured last).

The left-hand screw (N) determines the general adjustment of the maximum speed, engine power, temperature and gas mileage.

Customization carburetor lawn mowers with the last screw is performed as follows:

  • Open the throttle to full, while giving out full throttle. Turn the screw clockwise until the speed drops (in this case, they are oriented by ear).
  • Turn the screw as slowly as possible counterclockwise until the engine runs unevenly.
  • Then turn back quite a bit, barely hearing a stable, smooth operation.
  • For a more visual application of skills, it is more convenient to consider the work of an experienced user:

It is interesting that from the point of view of the author of the, the setting (its correctness) is determined by the color of the candle, and not just by the speed and stability of the engine.

The correct setting of the carburetor with your own hands in this case is the combustion of the fuel mixture without residue, the color of the candle should be light brown.

Carburetor Adjustment Lawnmowers Husqvarna 128r

Adjustment Summary carburetor lawn mowers.

Carburetor Adjustment and Repair lawn mowers

The trimmer does not belong to complex household appliances, so most of its breakdowns are mechanical in nature and can be successfully repaired with their own hands. Cleaning the carburetor of the Honda izy lawnmower. Even if the engine fails for serious reasons. Damage to the piston ring, for example, repair comes down to replacing the part.

But even with a relatively simple design, such a part of the device as a carburetor needs to be adjusted.

Principle of operation

A carburetor is a power system module in which liquid fuel and air are mixed before being fed into the engine cylinders. Depending on the tool and its operating mode, mixing and feeding are adjusted accordingly.

The carburetor device for lawn mowers is the same for almost all cases. It belongs to the category of float devices. The latter provide stable parameters of the finished mixtures.

The principle of operation of the module is as follows.

  • Air enters the body of the tube with an air damper. The latter enhances or reduces air flow depending on its position.
  • In the area where the hole for supplying gasoline is formed, the tube has a constriction. A diffuser. Here the flow rate increases.
  • Fuel from the float chamber through the nozzle is fed into the tube. The carburetor device for lawn mowers. Setting the carburetor lawn mowers Kraft. The float level determines the amount of fuel supplied. Since the pressure in the chamber is normal and low in the tube due to the greater dilution of air, gasoline is sucked through the nozzle.
  • Accelerated airflow picks up fuel and atomizes it, forming an air-fuel mixture of the desired density.
  • The mixture is sucked into the cylinder through a pipe.

The more open the air damper in the tube, the higher the density of the air flow, which means that more fuel enters the cylinder. Setting the carburetor of the lawn mowers is reduced to setting such a ratio of dampers at which the density of the fuel mixture becomes optimal.

Signs of imbalance

Carburetor debugging is necessarily carried out in the manufacture of the apparatus. As a rule, the owners will only learn about the need to adjust the fuel supply with their own hands after sufficiently serious breakdowns, during the correction of which the module was removed and, for example, cleaned.

Signs of a failure in the settings are as follows:

husqvarna, mower, carburetor, adjustment, adjust
  • It starts, but the engine stalls right away. Since the engine can only work when a certain amount of gasoline is supplied, if the fuel is too “poor”, that is, when the feed channel is blocked, the motor will stop;
  • Too much fuel consumption, a lot of exhaust gases. The result of incomplete combustion of the mixture. In this case, on the contrary, there is too much fuel and the mixture turns out to be excessively dense.

Husqvarna 125R carburetor tuning without tachometer (temporary solution)

How to adjust carburetor,if you need to work, and the service with a tachometer is far away.

Carburetor Lawn mowers STIHL, Makita, Husqvarna and others are adjusted using the adjusting screws. Sometimes the reason for the disorder of the work is a violation of fixation. Due to vibration or damage to the protective cap. Such a breakdown can be detected simply by trying to turn the screw a little: if the fixation is not rigid, it is worth checking the setting.

husqvarna, mower, carburetor, adjustment, adjust

DIY carburetor adjustment

The configuration of the module does not apply to repair and replacement of spare parts is not required. Cleaning the Honda Lawnmower Carburetor. In this case, the repair kit for the carburetor lawn mowers will not be needed.

There are three screws for debugging:

  • L. Is regulated first, since it is responsible for supplying fuel at low speeds;
  • H. He is responsible for the supply of gasoline at high speeds, as well as for fuel consumption and temperature;
  • T. With its help idle debugging is carried out.

There are options, as a rule, this is a Chinese lawn mowing carburetor, when there is only one screw left for debugging on the case. To adjust the idle speed. This does not mean that the module is automatically configured. It means that it will be difficult to carry out even a type of repair such as debugging. In the photo. Carburetor adjustment of the Chinese lawn mowers.

  • Setting up the module is carried out only when the engine is warm: for this, the device is first turned on for 10 minutes. Carburetor adjustment Cedar lawn mowers. If the mowing head rotates at idle, then proceed with debugging immediately: turn screw T counterclockwise until the rotation stops.
  • Adjustment starts with screw L. The screw rotates left and right until it finds its position at which idle speed does not become maximum.
  • Then turn the screw ¼ turn counter-clockwise. This will be his working position.
  • Idling must be adjusted by turning counterclockwise to increase the speed and clockwise to decrease. Its debugging consists in the achievement of such a mode in which a sufficient number of revolutions is made before the mowing head begins to rotate. In this case, the engine must work stably in different positions.
  • The position of the screw L is determined last. At maximum speeds the trimmer should not work for more than 10 seconds. The throttle opens, the screw turns clockwise, very slowly, until a decrease in the number of revolutions is established by ear.
  • Then, the screw also rotates slowly counterclockwise until the motor starts to malfunction. Then the screw is turned back clockwise until the engine starts working again normally.

If there is a tanometer, and if the recommended revolutions are indicated in the product passport, the correction can be made more accurate, focusing not on the ear, but on the readings of the device.

6 post Комментарии и мнения владельцев Adjustment and carburetor repair

Please clarify. In the adjustment section of clause 5, screw L error? Should I read screw A? Thank you

Tell me the initial position of the screws H L LA

Tell me the initial position of the screws H L LA

Husqvarna Chainsaw Carb Adjustment

Modern chainsaws have a complex system and consist of several main components, which periodically require maintenance and adjustment. In this article, we’ll talk about how to adjust the carburetor on a Husqvarna chainsaw.

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When does the Husqvarna chainsaw carburetor require adjustment

There are many problems that can be solved by adjusting the carburetor. Husqvarna chainsaw carburetor adjustment is necessary when a malfunction occurs such as:

  • Increased idle;
  • Heavy smoke during tool operation;
  • Difficulty starting a cold or hot engine;
  • Lack of traction and lower maximum revs.

This is by no means a complete list of problems that can be solved by tuning the Husqvarna carburetor. In some cases, adjusting the quality and quantity of the fuel mixture is carried out after an overhaul of the engine or in the process of scheduled maintenance of the chainsaw.

The manufacturer Husqvarna AB recommends adjusting the carburetor before and after the break-in.

The device and principle of operation of the Husqvarna carburetor

To successfully set up a Husqvarna chainsaw carburetor, you need to know its device and understand how it works. In fact, everything is not as complicated as it seems at first glance.

The saw carburetor has a built-in fuel pump, which is responsible for transporting a mixture of gasoline with oil, as well as a diaphragm, a needle valve with a rocker. Their joint work allows metering the fuel supply to the main chamber and two shutters.

One of the dampers is designed to adjust the fuel supply to the cylinder when pressing the gas, it is called the throttle, the second is responsible for restricting the air supply from the air filter to facilitate the start of the Husqvarna cold chainsaw. At that moment, when the operator shuts off the air supply to the carburetor with the help of an air damper, the fuel mixture is depleted and its supply to the cylinder is increased, due to which the chainsaw starts up much easier than when the cold start is carried out in normal mode.

An injector valve is involved in the operation of the Husqvarna carburetor, which atomizes the fuel and prevents air from entering the main chamber. Often problems when working with a saw can be caused by defects in this particular element. For example, a valve, if the chainsaw is not stored properly, can stick, fuel supply will stop, which will make the engine impossible. Also, malfunctions of the nozzle can cause air to leak into the main fuel chamber of the carburetor. In such cases, adjusting the position of the adjusting screws will not correct the situation; repairs or replacement of the assembly will be required.

For adjusting the quality and quantity of the mixture, as well as the number of revolutions of the crankshaft in idle mode, there are three adjusting screws installed in the carburetor body:

  • Screw (L). Adjusts the amount of fuel in low and medium speed mode;
  • (H). Responsible for traction at high speeds and their number;
  • (T). Changes the position of the throttle valve, thereby regulating the amount of fuel mixture entering the cylinder and the engine’s engine idling.

Screws (L) and (H) cannot be adjusted without specific knowledge and experience. Incorrect adjustment of the quality and quantity of the fuel mixture can cause the engine to stop working or malfunction, which will lead to its Rapid deterioration or even jamming.

Tools necessary for work

Before setting up the Husqvarna carburetor, you need to take care of the availability of all the tools that may come in handy. To carry out this type of work yourself, you will need:

An ordinary slotted screwdriver is not suitable for adjustment, because the adjustment screws on Husqvarna chainsaws can have a different cross-section. You have to purchase a special one, this is the peculiarity of repairing Husqvarna chainsaws, they did everything so that the saw could be repaired only in a specialized Husqvarna service.

Husqvarna carburetor algorithm and description

Husqvarna carburetor, is regulated similarly to how carburetors are adjusted on chainsaws from other manufacturers.

Immediately before the adjustment, it is necessary to conduct a complete diagnosis of the saw and make sure that there is no difficulty in supplying fuel and air intake into the crankcase of the chainsaw. You must also make sure the air filter is clean and replace it with a new one if necessary.

The procedure for the work is as follows:

  • Husqvarna carburettor factory settings are set on the muffled saw.
  • The engine starts and the saw warms up for several minutes.
  • By turning the screw (L) clockwise, there is a position at which the engine develops maximum speed, after which the screw must be turned back 1⁄4. If at the same time the chain of the chainsaw rotates, then it is necessary to reduce the idle speed by adjusting the position of the screw (T).
  • The next stage is the adjustment of the power of Husqvarna at maximum speed and the adjustment of their number. To do this, the tachometer is connected to the wound chainsaw, the throttle stick is squeezed to full, after which the tachometer readings are checked. If the maximum speed value differs from the maximum quantity recommended by the manufacturer, then by changing the position of the screw (H), the tachometer readings are normalized.

Adjustment nuances

After adjustment, the chainsaw should easily gain and lose speed, work stably at low and high speeds. If the saw chain rotates at idle after adjusting the carburetor control screws, this is a sign that the setting is incorrect and that the position of the screw (T) needs to be adjusted.

Also, when adjusting the Husqvarna carburetor, it is worth considering the response time of the chainsaw to the rotation of the screws. Settings do not change immediately, but within five, ten seconds.

One of the indicators of incorrect adjustment is a strong smoke during the operation of the saw, which indicates a large amount of fuel entering the combustion chamber. If this situation arises, adjust the position of the screw (L).

Factory settings

The factory default settings for the Husqvarna carburetor are the position of the screws (H) and (L), in which a working chainsaw must be guaranteed to start. For Husqvarna tools, this is one and a half turns from fully tightened screws (H) and (L). In the process of adjustment, you must first set the screws in the standard position, then start the chainsaw and make an accurate adjustment of power, the number of maximum revolutions and idle revolutions.

DIY carburetor repair

If during the complete diagnosis of the Husqvarna chainsaw, carburetor defects were detected, some of them can be eliminated without contacting the Husqvarna AB service center. For example, you can independently:

  • Change gaskets under the covers of the main chamber and fuel pump;
  • Clean or replace the strainer;
  • Replace the diaphragm or needle valve of the main chamber;
  • Repair the diaphragm of the fuel pump.

Gaskets, diaphragms and a needle valve with a rocker arm can be found in the repair kit that is available for each model of Husqvarna chainsaw carburetors.

Also, if you have some experience, you can try to restore the faulty valve-nozzle, but you cannot guarantee a positive result when trying to restore the nozzle, if it is faulty, manufacturers recommend changing the carburetor completely.

The first thing to do before removing the carburetor from Husqvarna is to clean the saw with a compressor, since dirt can interfere with a quality repair. Next, you need to open the top cover of the chainsaw, remove the air filter, disconnect the rods from the control levers of the air and throttle valves. After that, unscrew the screws securing the carburetor.

Dismantling the carburetor body for repairs is quite simple. The cover of the main chamber is held by four screws, which can be removed using a conventional screw, the cover of the fuel pump is fixed with one wide screw.

Below is a, watching which it becomes clear how it is possible to repair a carburetor without contacting a Husqvarna service center.


Work on setting up or repairing a carburetor on Husqvarna chainsaws can be completed without any specific experience. In order to do everything right, you must follow the algorithm and have a minimal set of tools. It is also worthwhile to evaluate your strengths in advance and not risk it if you do not understand anything at all in technology. Believe me, sometimes it’s better to pay a small amount to the master than to spoil the instrument by self-regulation.

Page 3

ContentINTERPRETATION OF CONDITIONSNOTATIONLegend. 2CONTENTContent. 3Before starting, make sureas follows. 3WHAT IS WHAT?What is what. 4GENERAL REGULATIONS FORSECURITYImportant information. 5Protective equipment for the operator. 5Protective devicestool. 6Cutting equipment. TenASSEMBLYHandle assembly. 13Shoulder Strap MountShoulder holder mountbelt. 13Mounting knives and headstrimmers. FourteenFastening of a guard, a knife and a disk forclearing. FifteenInstallation of protection and trimheads. FifteenRULES FOR HANDLING WITHFUELSafety Rules forrefueling. 16Fuel mixture preparation. 16Gas station. 18STARTING AND STOPPINGCheck before starting. 19Start and stop. 19WORK METHODGeneral work instructions. 21MAINTENANCECarburetor. 25Muffler. 26Spark plug. 27Air filter. 28Angular gearbox. 28Sharpening knives and discs. 28Maintenance Schedule. 29th

SpecificationsSpecifications. 31EC Compliance Warranty(

Before starting, make sureas follows:

husqvarna, mower, carburetor, adjustment, adjust

Please read carefullyinstruction manual.

Circumstances should not be madechanges to the originalmachine design withoutmanufacturer’s permission. Alwaysuse only original onesspare parts. Applicationunauthorized changesand / or accessories maycause serious injury orfatal operator orother people.

Brush cutter or trimmer thatuse carelessly orwrong can become dangerous andcause serious injuryoperator or others. Youmust know andunderstand the content of thisinstructions.

Long exposure to noiseleads to incurablehearing impairment. Therefore alwaysuse recommendednoise protection.Husqvarna AB constantlyworking on improving anddevelopment of their products and thereforereserves the right to makechanges in form and design withoutadvance warning.

We repair a lawn-mower of Husqvarna 128R

I decided to write a couple of lines about the Husqvarna 128R braid. I bought this tool 2 years ago. Well, I think the tool is eminent, I will mow and mow. Not heavily loaded 18 acres plus around the site.

He worked with her in the mode: he spent the tank and allowed it to cool for 20 minutes. Over the summer, 3.4 times the full mileage of the site and the surrounding area. Poured Husqvarna Oil. Could not get enough, as the plant with a half kick. This year, she stopped pulling and started badly. I even stopped using it especially, as I suggested that nothing lasts forever, and perhaps she was already tired of me. I can try to do it myself, I thought, and went for the tool. I’ll start by cleaning the carburetor, I suggested, and did not think for a long time to climb into the bowels of the lawn.

The first thing I did was to remove a candle like norms, clean it, it was better to replace it, but it wasn’t.The zero-idle result simply stalls. I take off the candle and check the spark. A spark that is, that is not. He began to probe and experiment. It turned out the tip of the high-voltage wire just fell off. Well, I think I don’t want to look for a new wire, time and money must be mowed. Soldered a vein of a high-voltage wire to a tip, I collect, anticipating a victory. But things are still there. Perhaps a spark jumped in the damaged wire and did not significantly affect the work. I disassemble again to remove and clean the carburetor of the lawn mowers, and he just hangs out. From vibration just unscrewed. It turns out during a set of revolutions the air flowed into the slot, impoverished the already poor mixture of gasoline and gasped for breath, and it rattled somewhat at idle. Here you have the American quality assembled in China. These bolts under the asterisk.

When disassembling, you need a screwdriver for interchangeable tips, asterisk tip and hexagon. Understands hemorrhoids. But apparently this is the key to reliability. Carefully and leisurely everything will turn out.

Air filter chamber. The filter was washed in kerosene. He became like new. Then it must be “moistened” in any oil. I will not describe the assembly of the braid. The main thing is not to lose the bolts and not mix them up. Different bolts with small and large threads. Large in plastic. Shallow on metal. The whole repair took about 2 hours. Good luck!

How to Clean Carburetor on Husqvarna Lawn Mower?

To clean the carburetor on a Husqvarna lawn mower, you need to first disconnect the spark plug wire and remove any debris from around the engine.

Next, locate the carburetor and use a screwdriver to unscrew it from its housing.

Once removed, inspect for dirt or grime buildup and then clean with a small brush or rag if necessary.

If there is significant gunk build-up in the air chamber of your carburetor, use an aerosol cleaner.

Then reassemble everything according to manufacturer instructions and reconnect all parts securely.

To finish off cleaning process make sure that all mounting bolts are tight so no fuel leaks out of your engine while running.

  • Step 1: Disconnect the spark plug wire from the spark plug
  • This is to prevent accidental starting of your lawn mower while you are working on it
  • Step 2: Drain all fuel from the tank and remove it, if possible
  • The carburetor may be clogged with old fuel so removing and cleaning or replacing it will help clean out any sediment or dirt buildup in the carburetor
  • Step 3: Remove the air cleaner assembly located above the carburetor housing, then unscrew and remove the main jet and idle mixture screw that are attached to it
  • Step 4: Use a small brush such as an old toothbrush to clean off any dirt or debris from inside of the carburetor housing, then rinse by spraying some carb cleaner into it (follow directions carefully)
  • Step 5: Reassemble everything in reverse order ensuring all connections are secure before moving onto reattaching your fuel tank for refilling with fresh gasoline

How Do You Clean a Lawn Mower Carburetor Without Removing It?

Cleaning a lawn mower carburetor without removing it is an important task, as this helps to keep your lawn mower running smoothly and efficiently.

The first step in cleaning the carburetor without removing it is to check the air filter for dirt and debris.

If there are any clogs, these need to be cleaned out before continuing with the process.

Once this has been done, you can then begin by spraying some cleaner into the various ports of the carburetor using a small spray bottle or aerosol canister.

This will help loosen up any deposits that may have built up within the system over time and should make them easier to remove when wiping down afterwards with a cloth rag or brush.

After all of these steps are complete, you’ll want to use compressed air (or shop vacuum) on each port of the carburetor in order to blow out any remaining dirt and debris from inside.

Finally, reassemble everything back together and give your machine a test run – if all goes well then you’ve successfully completed cleaning your lawn mower’s carburetor without having removed it!

Can You Clean a Carburetor Without Removing It?

Yes, you can clean a carburetor without removing it from the vehicle.

The process is relatively simple and can be done with a few basic tools, such as a can of carburetor cleaner, an adjustable wrench or socket set, and some rags or paper towels.

First, make sure that your engine is off and cool before beginning – this will help keep any solvent fumes away from the engine’s hot parts.

Next, locate the carburetor on top of the engine – most vehicles have them in plain sight near the air filter housing.

Once you’ve identified it, use compressed air to blow out dirt and debris from around where it’s attached to the intake manifold.

Then spray down all accessible parts of the carburetor with some carburetor cleaner – take care not to get any on painted surfaces!

Follow up by wiping away any excess dirt or gunk with a rag or paper towel until everything looks clean and free of grime.

Finally, adjust any screws that may need adjusting for optimal performance before starting your vehicle again; if done correctly your car should be running like new again!

How Do I Know If My Lawn Mower Carburetor is Dirty?

If you think that your lawn mower carburetor is dirty, there are a few signs to look for.

First, if the engine is running rough or not at all, it could be due to a clogged or dirty carburetor.

Another sign of a potentially dirtied carburetor would be black smoke coming from the exhaust pipe while the engine is running.

When this happens, it means that too much fuel is being burned and not enough air is entering the motor.

If either of these symptoms occur when starting up your lawn mower, it’s time to inspect and clean out your carburetor as soon as possible before more damage occurs.

To properly clean out and inspect the carburetor on your lawn mower, make sure you have an appropriate cleaning kit available so that you can take apart each part of the unit safely and efficiently.

Once everything has been taken apart for inspection, use brushes and cleaners specifically designed for small engines like those found in most lawn care equipment to get rid of any residue buildup within each component before reassembling them back together again correctly.

What’S the Easiest Way to Clean a Carburetor on a Lawn Mower?

Cleaning a carburetor on a lawn mower is an important step in keeping your machine running smoothly.

Fortunately, it doesn’t have to be a time-consuming or difficult task.

The easiest way to clean the carburetor on a lawn mower is by removing all fuel from the tank, disconnecting the air filter.

And throttle/governor linkages, and then using compressed air, gasoline-approved aerosol cleaners, or cleaning solutions to thoroughly flush out dirt and debris from all accessible areas of the carburetor.

Be sure to use eye protection when working with any type of cleaner!

Once you’ve finished cleaning the parts of your carburetor that are visible, reassemble everything and check for smooth operation before replacing any parts or making adjustments.

With regular maintenance like this you can keep your lawn mower running at peak performance for years to come!

Husqvarna Lawn Mower Carburetor Problems

Husqvarna lawn mowers are reliable and dependable machines, however they may occasionally run into carburetor issues.

Common problems can include the engine not starting at all, the engine running too slow or fast, stalling after startup, a decrease in power while mowing, or an excess of fuel being delivered to the combustion chamber.

If you are experiencing any of these issues with your Husqvarna lawn mower’s carburetor it is best to take it to a professional for maintenance and repair.


In conclusion, knowing how to clean a carburetor on a Husqvarna lawn mower can save you time and money as well as extending the life of your lawnmower.

It’s an important maintenance task that should be done regularly in order to keep your lawnmower running smoothly.

With the steps outlined above, you now have all the information you need to properly clean your carburetor so that it provides optimal performance for years to come.

How to properly adjust the carburetor on a Husqvarna trimmer

Now we remove the membrane. It is she who performs the function of pumping fuel into the carburetor.

When the membrane vibrates, the other side exerts pressure on the rocker of the mechanism and the needle rises, which, in turn, opens the hole and the fuel is supplied.

Step 3

They have the ability to wear out during operation. From prolonged use, they deform, stretch, lose elasticity, poor-quality fuel corrodes them, and can no longer perform their functions well. This also applies to the needle itself. The fact is that it is covered with a thin layer of rubber, which wears out during operation and can no longer fit tightly into the hole. the lawn mower starts to work intermittently. To eliminate such a breakdown, it is necessary to replace all worn out parts. Where to get them?

It includes two diaphragms, a gasket, a needle valve and a spring.

All wear parts of the carburetor can be replaced. Therefore, you should not rush and buy a new one, and you do not need to run to the workshop either, repairs are within the power of any lawn mower user. Professionals claim that the quality of the components in the repair kit even exceeds the characteristics of the native carburetor parts. Therefore, a well-repaired unit will perform better than a new one.

Instruction for Chinese

To correctly configure the carburetor of a Chinese chainsaw, you must first remember the factory settings of the device, then turn on the engine. Subsequently, you will have to leave it to work for several hours in order to accurately set your own parameters. Sometimes work is performed once after ten minutes of engine operation, however, many Chinese-made models require special handling.

  • Activities start in idle mode. With the help of the adjusting screws, you need to achieve a systematic set of revolutions by the engine, so you should first let it run at low speeds. The deviation from the norm is the movement of the chain along the tire. In this case, you need to adjust the extreme screws to the optimal position so that the chain remains stationary.
  • The transition to average speed turns is carried out. Sometimes the engine will smoke. This defect can be eliminated by tightening the screw to supply a leaner fuel mixture.

In this case, the smoke will disappear, but the engine speed will increase. It is necessary to adjust the settings until the level is reached when, when you press the throttle, the engine smoothly picks up speed, no sudden jerks or interruptions are heard.

Carburetor Trimmer Adjustment

The initial step in restoring the correct operation of the fuel system is to clean the air filter.

Trimmer carburetor with screws

Experts recommend rinsing it in a solution of water and detergents after every 10-15 hours. Direct adjustment of the carburetor trimmer is done with three adjusting screws:

  • fuel adjustment screw (“L”);
  • high speed adjustment screw (“H”);
  • the screw responsible for the engine idling (“T” or “AT”).

Fuel supply adjustment at minimum speed

Before starting tuning the carburetor of the petrol trimmer, it is required to warm up the engine to operating temperature.

To do this, we start the internal combustion engine and, at idle, let it run for 10-15 minutes. In the first step, with the trimmer running, slowly tighten the screw “L” until the start of intermittent operation or until it stalls. Next, unscrew the screw ¼ of a turn and check the speed of the set of maximum revolutions. If the lawn mower reaches high revs quickly and easily, this will be the most economical mode. In most of the models on the market, the fuel screw “L” is twisted clockwise, but there are trims where the decrease and increase in the supply of the mixture occurs in the opposite order.

Problem 2: Clogged fine filter

It is located on the carburetor cover and is a fine metal mesh. Its pollution occurs very often. This is due to the deposition of oil, additives, dirt on it.

DIY lawn mowers carburetor adjustment

Periodic adjustment of the trimmer carburetor should be performed on a serviced and fully serviceable power unit. Before starting the procedure, the operator must thoroughly rinse the internal combustion engine parts and inspect its CPG for burrs or other defects. In addition, you will need to clean or change the spark plug, as well as rinse the filter elements in the lawn mowers structure.

The lawn mower engine must be running under a certain load when adjusting the carburetor. It is best to install a cord of the appropriate diameter or cutting knives on the trimmer.

After installing the cutting elements, the operator should start the internal combustion engine of the trimmer and leave it to work for about 10 minutes. If, during the operation of the power unit at idle, it was noticed that the cord or knife rotated, then it is necessary to reduce the speed generated by the motor. To do this, turn the lower adjuster, often marked with the letter “T”, to the left, until the installed cutter comes to a complete stop.

husqvarna, mower, carburetor, adjustment, adjust

Further configuration of the fuel assembly is as follows:

  • The “L” regulator, located on the right, is responsible for enriching the fuel mixture with air when the engine is running at low revs. The position of this screw must be adjusted first. To do this, the operator will need to achieve maximum engine speed when idling – to do this, turn the screw “L” one by one to the right or left. As soon as the maximum speed is reached, the screw will need to be turned 1/2 turn to the left;
  • The screw “T” or “LA” is required to adjust the idle speed. While turning it to the left, the speed of the power unit will decrease, and when turning to the right, accordingly, it will increase;
  • The regulator “H”, provided on the left, is responsible for enriching the fuel mixture with air when the internal combustion engine trimmer is running at high rpm. This screw is also needed to adjust the engine power and the amount of fuel consumed. Its position is adjusted by turning the screw to the right or left side until the maximum permissible engine speed is reached. After that, the screw “H” will need to be turned 1/2 turn to the left.

Performing these steps one by one will allow you to correctly configure the fuel trimmer assembly, without the risk of exceeding the permissible load on its main working mechanisms.

The trimmer does not belong to complex household appliances, therefore, most of its breakdowns are mechanical in nature and are quite successfully eliminated with their own hands. Even if the engine fails for serious reasons – damage to the piston ring, for example, repairs are reduced to replacing a part.

But even with a relatively simple design, such a part of the device as a carburetor needs to be adjusted.

A carburetor is a power system module in which liquid fuel and air are mixed before being fed into the engine cylinders. Mixing and flow are adjusted accordingly depending on the tool and its mode of operation.

The carburetor device for lawn mowers is the same for almost all cases. It belongs to the category of float devices. The latter provide stable parameters of ready-made mixtures.

The principle of the module is as follows.

  • Air enters the body of the air damper tube. The latter increases or decreases the air flow depending on its position.
  • In the area where the hole for the gasoline supply is formed, the tube has a narrowing – a diffuser. Here the flow rate increases.
  • Fuel from the float chamber is fed through the nozzle into the tube. The float level determines the amount of fuel supplied. Since the pressure in the chamber is normal, and in the tube it is low due to the greater rarefaction of the air, gasoline is sucked in through the nozzle.
  • The accelerated air flow picks up the fuel and atomizes it, forming an air-fuel mixture of the desired density.
  • The mixture is sucked into the cylinder through the pipeline.

The more open the air damper in the tube, the higher the density of the air flow, and, therefore, more fuel enters the cylinder. Adjusting the carburetor of lawn mowers is reduced to setting such a ratio of flaps, at which the density of the fuel mixture becomes optimal.

Summing up

First you need to carry out maintenance – clean the candle from carbon deposits, adjust the gap. Then you need to remove and clean the air filter from dust and dirt.

Next, you need to adjust the idle speed – so that the air damper opens almost completely, leaving a slight free play of the cable.

After that, we put back the candle and the filter, and we are already adjusting the gasoline supply screw and the idle screw.

For more information on how to adjust and maintain the carburetor on lawn mowers, see the video below. The review was prepared on the basis of the author’s video from the YouTube channel “Pogranets 13”.

The stable and efficient operation of a household trimmer largely depends on the quality of the fuel used by the operator. The filled fuel mixture must be enriched with air – a built-in carburetor is responsible for this in the basic device of the lawn mower. This knot is one of the main elements of the streamer, so the operator must constantly monitor its serviceability and settings. Otherwise, the trimmer will lose its performance and may completely fail.

Fine tuning the carburetor

If the engine starts, but stalls, then it is necessary to adjust the idle screw. If the revolutions are high – unscrew the screw, closing the air damper.

How to adjust your idle screw on your Husqvarna 128LD

In the event that the revolutions, on the contrary, are small, then we tighten the screw, opening the air damper. “Playing” with this screw, you can achieve optimal parameters of the engine at idle.

If the engine stalls directly during operation (when you mow the grass), then you need to re-adjust the gasoline supply screw. Unscrew or tighten this screw until we achieve the desired result.

Maximum speed limitation

After adjusting the fuel mixture and low speed, check how the lawn mower engine will run at maximum speed. If necessary, limit the maximum speed to the required level using the hollow screw. Loosen the locking nut and screw in the screw to decrease the maximum speed or turn it to increase. Tighten the nut after adjustment. The maximum RPM setting is necessary to protect the trimmer motor from overheating and to be able to use the start key lock to reduce right hand fatigue.

In the future, it may be necessary to readjust the trimmer carburetor. For example, if the engine starts to rev poorly when running at full load, loosen the screw another quarter turn. If starting is difficult, increase idle speed. Both weather conditions and the quality of the fuel mixture can affect the operation of lawn mowers. Vibration can cause the adjusting screws themselves to turn.

Fuel supply adjustment

Start slowly tightening the fuel mixture adjustment screw until the engine starts to stall or stalls if you do not have time to catch the moment. After that, unscrew the screw a quarter of a turn if the engine did not stall, or half a turn if it stalled. Start the stalled engine. Check by opening the throttle as the engine picks up speed. Continue to unscrew the screw a quarter of a turn until the engine starts to accelerate steadily during gas blowing. This will be the moment of the most economical stable engine operation. For the PRORAB-8406 petrol trimmer, the adjusting screws are turned clockwise, unscrewed – counterclockwise, for some other brands the lawn mower can be the other way around.

Candle cleaning

In the worst times of trimming with an unadjusted carburetor, the engine would stop starting after every tank of fuel was used. And only after cleaning the spark plug from carbon deposits it was possible to continue working.

Husqvarna 128ld trimmer carburetor adjustment carb

Fine sandpaper was used to clean the electrodes, and a thin paper clip with a bent end was used to clean the space between the insulator and the body. First, the electrodes were wiped from large dirt with a rag, then they were smoothed with sandpaper. After that, the candle was dipped into diesel fuel and the moistened carbon was scraped off with a paper clip from the surfaces of the insulator, the inside of the body and between them. Then the candle was dipped several times into the diesel fuel, which was then shaken off it along with the dirt. Sometimes the paper clip cleaning and rinsing procedure was repeated. After that, the candle was wiped dry and was ready for further use.

Incredibly, one tank of the fuel mixture with an unregulated carburetor can be used up in less than 10 minutes – tested in practice when the trimmer was started and operated at high speeds with maximum fuel supply (the adjusting screw was unscrewed much more than normal).

Husqvarna 323L Carb Rebuild and Tank Vent Unclogged. Weed Eater Trimmer Tune Up

Other articles on this topic:Lubrication of the shafts of lawn mowers, trimmers

To prevent the petrol trimmer (lawn mower) from junk during operation, you need to properly adjust the carburetor. Well, you shouldn’t forget about periodic maintenance either.

In this review, we will look at the main nuances that a beginner who first bought a gasoline trimmer needs to know.

Idle speed adjustment

We start adjusting low speed. The screw limits the return movement of the throttle lever – by turning it, we increase the idle speed, unscrewing it, we decrease it. Adjust so that the engine runs confidently at low revs and even slightly accelerated (for better starting), but so that the line reel or knife does not rotate, and there is a sufficient reserve of revolutions before they start spinning. If the engine starts poorly, increase the idle speed even more.

The Best Self-Propelled Lawn Mowers in 2023 for Making Your Yard Work Easier

These lawn mowers drive themselves, taking the load off you in the process.

By Roy Berendsohn Published: Mar 21, 2023

One of the perks of the warm-weather season is getting to spend time outside. If you own your own home and have a yard, it’s very likely that in order to enjoy your outdoor space, you need to mow the lawn. The larger the yard, the more work it will be to maintain. If you have a lot of grass to cut, you’d be wise to consider a self-propelled lawn mower especially now that there are a ton of sales just in time for Memorial Day.

The primary difference between a standard push mower and a self-propelled mower is that the former moves when you push it, and the latter essentially moves itself with only your guidance. Once the engine is running, all you have to do is squeeze a handle or push a lever and the mower will start moving forward with you as you walk.

Turning the mower around is your job, but once you have your heading, just keep the drive handle squeezed and escort the mower down the path, no pushing necessary.

Self-propelled law mowers take power off the engine and route it via a belt to a pulley on the transmission and axle. When you move the drive control lever on the mower handle, you tension the belt, causing the pulley to turn, and this drives the transmission, moving the mower forward.

Move the drive control lever back and the tension is released, the pulley stops turning, and the mower stops moving forward. The belt-driven transmission is a time-tested design to power the mower and take the load off you in the process.

What to Consider

A mower is like many consumer products in that the more features a manufacturer adds, the more expensive it becomes. But a longer or more eye-catching list of features isn’t necessarily better. Sometimes less is more. Here are the most important to keep in mind.

Front-wheel drive mowers tend to be less expensive than rear-wheel drive units. They can be easier to turn because you don’t have to disengage the drive wheels to do so. Simply push down on the handlebar to raise the front wheels off the ground. However, their traction isn’t as strong on hills or when the bag is full, as there isn’t as much weight over the drive wheels.

Rear-wheel drive mowers do cost more and aren’t as easy to turn, as you do need to disengage the drive—but this isn’t too much of a hassle. Rear-wheel drive mowers shine on hills and inclines, and when the grass bag is full. In either scenario, weight is shifted rearward and over the drive wheels, which enables superior traction, thus making the self-propel more effective.

An engine as small as 125 cc can power a mower, but most are somewhere in the 140 cc to 190 cc range. A large engine helps when powering through tall, lush grass or in extreme conditions, such as with a side discharge chute in place and mowing tall weeds in a border area. Also, the extra torque provided by a larger engine can improve bagging when the going gets tough (tall, leaf-covered grass in the fall). But if you mow sensibly and pay attention to deck height—and especially if you don’t let your lawn get out of control—an engine between 140 and 160 cc has more than enough power to get the job done.

A mower can have all four wheels the same diameter (7 to 8 inches), or it may have rear wheels that range from 9.5 inches to 12 inches in diameter. Larger rear wheels help the mower roll more easily over bumpy ground.

With some mowers you can start the engine with the twist of a key or the press of a button. It’s a great option, but a luxury. Keep the mower engine tuned and use fresh fuel with stabilizer added to it, and you’ll never have trouble starting.

Any number of mechanisms can control a mower’s ground speed—a squeeze handle, a drive bar that you press forward, even a dial. There’s no single right answer here. Look at the design and think about how you like to work. For example, if more than one person will be using the mower (and not all of them are right-handed), a drive control like that on a Toro Personal Pace mower might be the answer. Just push down on the bar to make it go faster. Let up on the bar to slow down.

A mower that can bag, mulch, and side discharge is known as a three-function mower, the most versatile kind. Two-function mowers bag and mulch or mulch and side discharge.

Mowers will typically have one, two, or four levers to control the deck height. Single-lever adjustment is the easiest to use, but it requires more linkage, which adds weight and complexity. If, for some reason, you find yourself varying deck height frequently, it’s a good option. Otherwise, two or four levers work just fine.

Only Honda makes a gas-engine mower with a high-impact plastic deck (there are battery mowers that have plastic decks). Otherwise, mowers generally have a steel deck, and a few manufacturers—Toro, for one—offer a corrosion-resistant aluminum deck. An aluminum deck won’t rot the way a steel deck will, but you still need to keep it clean.

This is a hose fitting mounted on top of the mower’s deck. When you’re done mowing, hook up a hose and run the mower to power wash the underside of the deck. We’ve had mixed results with these, but they’re better than just letting a mass of dried grass clippings accumulate.

expensive mowers come with a more durable bag with more dust-blocking capability. If you bag a lot, especially leaves or other lawn debris in the fall, then you need a mower with a higher quality dust-blocking bag. Having said that, if you rarely bag, the standard one that comes with a mower will last you the life of the mower.

Also called wide-area mowers, machines in this subgroup help homeowners better reconcile their need for more power and speed with the fact that they may not have enough storage for a tractor or zero-turn mower. A typical residential walk mower has a single-blade deck that cuts a swath from 20 to 22 inches wide. Wide-cut mowers (built for homeowner use) have either a single blade or, more typically, a pair of blades, cutting from 26 to 30 inches with each pass. Some of these are rated for light commercial use and have larger decks, in the 32-inch range, and engines that start at 223 cc and go up to about 337 cc.

Wide-cut mowers typically employ gear or hydrostatic drive transmissions, and they have top speeds of about 4 to 6 miles per hour. At their fastest, they move so quickly you have to trot to keep up with them. Needless to say, they’re overkill for small yards; only opt for one of these if you’ve got a significant plot of land that you need to keep tidy, but not one so large that you’d be better off going with a full-on riding mower.

How We Tested and Selected

We compiled this list based on Popular Mechanics mower testing and our knowledge of the lawn mower market at large. For our testing, we put mowers through the paces using our standard Popular Mechanics methodology: We cut turf grasses such as fescues and blue grass and rougher non-turf grasses like Timothy, clover, orchard grass, and wild oats, all in both normal and shin-deep heights. We mow uphill, downhill, and across the faces of hills. The maximum slope we cut is about 30 degrees.

That may not sound like much, but it’s about all you can do to stand on it, let alone push a mower up it or across it. We mow damp and wet grass to test general cutting performance and whether clippings accumulate on the tires. And we cut dry and dusty surfaces to see how well the bag filters under less-than-optimal conditions.

Honda HRN 216VKA

Key Specs

Honda mowers enjoy a sterling reputation. Having tested their walk and self-propelled mowers for the last 30 years, we feel confident that Honda’s entry level mower is a great choice for homeowners looking for power and durability. The HRN features a GCV 170 gas engine that’s built to withstand long hours of operation.

If you do your own maintenance (and most owners who buy this class of product do), you’ll appreciate the easily accessible spark plug and the fuel shutoff valve that enables better winter storage. Close the fuel shutoff and run the mower until it sputters to a halt. This will clear the carburetor of any gasoline, which will prevent the ethanol in it from disintegrating and causing running issues later on. Open the shutoff valve in the spring, add some fresh gasoline, and the mower should start easily.

All this maintenance stuff is great, but we can also tell you that our past test findings on other Hondas prove that their cut quality is outstanding for cleanliness. Sharp blades deliver a velvet-like finish. And their bagging ability is also quite good, in the same league with other well-bagging mowers from Toro.

In all, if you take mowing seriously, you should enjoy this Honda. If you have a little wiggle room in your budget, consider the Honda HRX, which features a mower powerful engine and a composite deck that won’t rust and is renowned for its durability.

One note is that Honda has announced that it will cease selling lawn mowers in the United States after this year—so if you’re considering buying one, best do it sooner rather than later.

Toro Recycler 60-Volt Max Lithium-Ion

Key Specs

Toro mowers have garnered more recommendations from us than any other brand for two reasons: build quality and cut quality. These were amply demonstrated in our testing as the Recycler turned in the best ratio of cut area per amp-hour of battery in the self-propelled category, while at the same time not skimping on cutting, mulching, or bagging quality.

We attribute this outstanding mower performance to three features, all upgrades to the previous version of this machine. First, the air vent at the front of the mower deck seems to improve mulching and bagging performance. Toro calls it Vortex technology, a design that increases air flow under the deck. This helps to stand the grass for a cleaner cut, which improves mulching performance, and also allows better airflow into the bag when collecting the clippings.

Next, the company’s redesigned “Atomic” blade configuration appears to assist the air flow and clipping movement. Finally, the three-phase, 60-volt motor is exceptionally efficient, resulting in a large cut area for a single battery.

Toro has maintained features that make this mower work: rear wheel drive, a one-piece deck that’s all steel (no plastic nose), 11-inch wheels to help it roll over roots and crevices, and the same fold-forward handle that was an industry breakthrough when it was introduced some years ago.

Ryobi 40-Volt Brushless Self-Propelled Mower

Key Specs

This is one of Ryobi’s top-of-the-line mowers, and it’s American-made construction is something we wish we saw more of. It delivers a tremendous cut area with its two 6-Ah batteries providing a total of 12-Ah of capacity, and its X-shaped blade leaves a pristine surface in its wake.

Ryobi estimates the design should provide 70 minutes of run time; we didn’t time our cut, but it strikes as plausible. Its rear-wheel drive and reasonably aggressive tire tread pattern provide good hill climbing and sidehill cutting performance, and its bagging on all surfaces (level, sidehill, and uphill) is also commendable.

Other ease-of-use features include an easily installed or removed bag that mounts and dismounts straight up and down through the handle; deck adjustment is quick and easy thanks to a single-level deck height adjustment. The straight edge deck is polypropylene; it will never rust and needs very little care other than basic cleaning.

Toro TimeMaster 30 in. Briggs Stratton Personal Pace

The Toro Timemaster 30-in. mower has been around for several years and has earned a reputation as a sturdy workhorse for homeowners who want to cut down on their mowing time. It’s also used by some professionals as well. A few years ago the Timemaster got a slightly more powerful Briggs and Stratton gas engine, so it should have no issues powering through most demanding mowing jobs.

The Timemaster is rear-wheel drive and features Toro’s Personal Pace drive system that’s used on many of its self-propelled mowers. This allows the mower to move at your speed by simply pushing down or releasing the handle, which is spring-tensioned.

With a 30-in. deck, Toro claims the Timemaster will help you reduce your mowing time by about 40% compared to using a standard-sized mower. You can mulch, back, or side discharge with the Timemaster, and the handlebar can be locked in a fully vertical position to reduce space consumption in storage.

If you have half an acre to a full acre of lawn to mow and prefer the experience of a walk-behind mower versus a tractor or zero-turn, the Timemaster is worth a look.

husqvarna 122hd45 carburetor adjustment

Craftsman M220

Key Specs

Craftsman mowers have been doing very well in our tests, so we can recommend this one because it’s so much like the many other of the brand’s models that we’ve tested. If you’re looking for a good blend of maneuverability and power, you’ll get it with this mower. Its front drive helps move it along and makes it easy to turn.

It’s important to note that front-drive mowers do lose some traction when running uphill, particularly with a full grass bag. But if your slope is less than 20 degrees, and you’re not bagging uphill, you’ll be fine. The side discharge will also help you handle tall grass. Adjust the two deck levers to bring the mower up to full height and have at the rough stuff.

The fact that this mower bags, mulches, and side discharges is a plus, enabling you to handle a wide range of mowing conditions, from early spring and late into the fall. Three-function mowers like this are our preference for that versatility.

Toro Super Recycler Self-Propelled Lawn Mower

Key Specs

This is a beauty of a mower, with a cast-aluminum deck and a smooth-running Briggs Stratton 163-cc engine. We tested the Honda engine-equipped version, and it was effective at both bagging and mulching, even in moist grass.

Equipped with rear-wheel drive and the Personal Pace system (the farther you push the drive bar, the faster the mower goes), it’s an effective hill climber and moderately effective on sidehill cutting. It has relatively small 7.5-inch tires on all four corners, which causes this Toro to bump up and down a bit on washboard surfaces. But the good news is that it’s equipped with a far higher quality tire than we’re used to seeing these days. We didn’t notice them pick up any grass on moist surfaces.

Other features we like include its forward-fold handle that has a built-in shock absorber that Toro calls a Flex Handle Suspension, and a high-quality grass bag that loads through the handle, from the top.


Are there special maintenance considerations with self-propelled mowers?

Yes. Both front- and rear-wheel drive mowers typically feature a drive belt, which can crack or wear out over time. Fortunately these belts are not difficult or particularly expensive to replace.

Secondly, you may have to replace the drive wheels occasionally. These wheels are driven with gears. there are typically teeth on the inside diameter of the drive wheel that line up with a gear on the axle. These teeth can wear out, especially if they are made of plastic. Higher-end mowers may feature drive wheels with a metal gear that meets the metal axle gear, which improves longevity of these components.

My lawnmower says I don’t ever have to change the oil, but just add oil when needed. Is this OK?

It’s not a good idea to never change the oil in your lawn mower. In a lawn mower, same as a car, oil degrades over time and is less effective at reducing heat and friction in metal components. Changing the oil in your lawn mower is easy to do and will significantly increase its service life. For most homeowners, changing the oil at the beginning or end of each mowing season should be sufficient, though there is certainly no harm in doing it more often.

Roy Berendsohn has worked for more than 25 years at Popular Mechanics, where he has written on carpentry, masonry, painting, plumbing, electrical, woodworking, blacksmithing, welding, lawn care, chainsaw use, and outdoor power equipment. When he’s not working on his own house, he volunteers with Sovereign Grace Church doing home repair for families in rural, suburban and urban locations throughout central and southern New Jersey.