No idle on the trimmer

Failure of the chain lubrication system in the chainsaw

What are the breakdowns in the chain lubrication system?

In the first case, first inspect the channels that carry oil to the tire, and clean them. their clogging is quite widespread phenomenon.

If there is a big oil leak (small oil leak is normal in all gasoline saws) it is necessary to check the tightness of pipes and nipples of the oil pump. Tubes can fall off and even crack. Tubing leaks are repaired by replacing or caulking with sealing material.

As for the oil pumps, different chainsaw models can have different designs, and they are also driven in different ways (usually driven by a drive sprocket or a special gear on the crankshaft). If the problem is with the oil pump, most often it will not be necessary to completely replace this entire unit, it will be enough to replace its moving part (plunger), it is she most often fails due to ingress of large amounts of dirt and sawdust.

The most serious damage is a crack in the oil pump housing. In this case, you will have to replace it completely.

idle, trimmer


Grass trimmers are reliable and durable (of course, if properly maintained). The most frequent malfunctions are caused by contaminated elements.

If your lawn mower motor won’t start, won’t pick up speed, won’t reach the power you need, or suddenly stalls, the cause could be:

  • low-quality fuel (fuel mixture), it can be caused by prolonged storage or failure to comply with the formulation of the mixture;
  • grass wrapped around the line/blade head shaft;
  • clogged air filter/muffler;
  • unbalanced carburettor.

What to do if the lawnmower stalls when you press the gas

Most often, in the periods when the lawnmower stalls when adding gas, the cause will be the air damper, or rather, its condition: it is clogged. Structurally, the part is located where the received fuel is atomized behind it, and accordingly, the product collects all the inclusions in poor-quality gasoline. To fix the problem, you just need to clean it. The same situation can occur with a clogged filter, but it can be fixed in the same way. To summarize, let’s specify the reasons that lead the tool to stall when the gas is pressed:

  • clogged air damper;
  • clogged fuel filter, and when you give the gas. it is especially noticeable;
  • air leakage at crankshaft oil seals;
  • the gasket between the cylinder and the carburetor is damaged.

When you have cleaned, washed and purged the elements, but again the lawnmower stalls when you press the gas. replace them with new ones, check the quality of fuel, as well as the literacy of the proportions of the prepared mixture. When the air damper is opened, the tool will stall for the following reasons:

  • Malfunction of the carburetor metering system.
  • Cracked fuel hose caused air leakage.
  • Occurrence of packing problems.

In the process of work, there are situations where the lawnmower at high revolutions is subject to a similar abrupt stop. It occurs for the following reasons:

  • Fuel mixture circulation problems;
  • with air leaks;
  • The fuel intake hose is badly connected or cracked and can no longer be used;
  • the gasoline tank lid valve is stuck or clogged;
  • carburetor malfunctioned.

In most cases, though, the cause will be the carburetor and associated filters, hoses. If you need cutting gear or trimmer heads, then buy them also gladly offer our website gasoline tools and accessories for them.

The most frequent causes of faults in gasoline mowers

It is obvious that the more reputable the manufacturer, the more reliable his products. this is the main criterion for determining the reliability of the average buyer. The second criterion can be called the cost, the third. the reviews of the owners, who have checked the work of the tool with their own practice. By the way, high cost often does not mean high quality, durability and resistance to breakdowns. It is better to do a more detailed market analysis before buying a ride-on lawn mower. And then choose the “golden mean.”.

Before proceeding to the list of the most common causes of mower failures, we note that very often inexperienced owners of petrol mowers do not know, for example, what ratio of gasoline and oil should be poured into the fuel tank, what gasoline is better to add to the machine, how much oil to pour in gasoline and so on.

Some also don’t know what kind of grease to use for the gearbox, how to sharpen the blade or disc, and many other nuances. Because of these and other reasons, unfortunately, in a large number of cases and happens the breakdown of various techniques, including trimmers and petrol mowers. Users simply do not take proper care of the equipment.

However, there are a number of the most common causes, resulting from the specific functions performed and other external and internal factors that lead to breakdowns:

  • The cutting cord doesn’t feed or breaks off too quickly. This occurs due to a lack of fishing line, or there was a tangled lawn mower line in the spool;
  • engine won’t start. Inexperienced users may not always be able to start the machine the first time because the start button is off. But there are other factors: the air filter is clogged; the spark plug clearance is not set, or it is out of service; the gasoline carburetor can often overfill the fuel mixture; pumped insufficient amount of fuel;
  • often lawnmowers do not develop speed, which can be caused by four factors: clogging of the air filter, clogging of the shaft with the cutting spool of mowed grass, improperly adjusted carburetor, bad fuel poured into the tank;
  • the engine does not run at idle speed. If the engine itself is good, but stops at idle, there may be three reasons: the air supply filter is clogged; the carburetor is not adjusted; bad gasoline or lawnmower oil is applied;
  • Also regularly encountered such a problem as a lack of spark. Causes: bad clogging, broken spark plug, failed or oxidized contacts of the supply armature.
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In addition to the listed most discussed gasoline mower failures and their causes, you can find a lot of other complaints and reviews about this tool on the web. However, the following chapter is devoted to how to solve the problems that are listed above.

1.1 Ways to Troubleshoot

Cord breakage happens no matter what quality of line is in the spool. To fix it, all you need to do is rewind the cord in the spool if it gets tangled, or rewind a new one if it’s missing.

How to start a lawn mower if the engine won’t start? Check that the start button is on, that you have pumped enough oil with the feed button, that you have filled the tank with gasoline. If the engine still does not start, wash the gasoline filter (sometimes it should be replaced if a large clog is detected), check the spark plug for performance, clean the air filter.

That didn’t help? Adjust the carburetor air damper to the C position, this solves the problem of fuel overflow. In the case of a “stubborn” motor, simply drain all the fuel from the system and fill up with new fuel, making sure that it is of proper quality. Doing all these processes solves the problem of starting the engine in 80-90% of cases.

If the engine refuses to run at idle speed, first adjust the carburetor and flush the unit’s air filter. this solves the problem in most cases. If the situation repeats, then most likely you poured bad fuel in the fuel tank, then drain it and fill the tank with new.

How to start the lawnmower and make it work, if the engine revolutions do not gather and it stalls? Check first, if the cutting shaft is not clogged with grass and weeds. If the shaft is okay, wash the air filter or change it for a new one if you found the first one too dirty. By the way, you should wash the air filter with detergent and gasoline, which makes the gasket more elastic and prevents the material from drying out.

If, after doing these procedures and pressing the starter for the lawnmower, the lawnmower stalls again, then the matter lies in a misadjusted carburetor. Read the last section of this article, it tells how to adjust the carburetor on a gasoline mower.

If there is no spark, put in a spare spark plug to check exactly what is wrong. When the spare spark plug, when installing the correct gap also does not produce a spark, then the matter is in the equipment of the grass mower. Repair of the lawnmower in case of malfunction begins with a check of the wire leading to the spark plug.

Clean the pins, you can also clean the pins of all the surrounding wires, make sure all the wires are intact. After following these steps, pressing the starter button of the lawnmower should result in a spark on the spark plug. Remember that when checking the spark plug must be in contact with a metal surface in order to create an electrical mass. We emphasize that the resetting of the revolutions (engine damping) is often affected by contamination of the gearbox of the lawnmower.

The lawn mower won’t start or starts but stops. What’s the reason?

To understand this you need to know the principle of the unit as a whole. It happens and so, just bought, new saw does not start, and starts running to service centers, in such cases it is recommended:

Carefully read the instruction manual; study in detail the way of the first start-up and running-in of the lawnmower; try to understand the principle of operation of the product, how gasoline is pumped and so on.

Easily fix a trimmer that won’t idle

the quality of the gasoline is bad; the wrong proportions of gasoline and oil; the fine filter is clogged; the spark is gone.

Lawn mower won’t start after winter

In such cases, have the machine serviced. Remove the fuel system, including filters (air, fuel), disassemble the carburetor, clean each component, flush. Blow out the filters with air. Pay attention to the quality and octane number of fuel.

Please note that products of famous brands like STIHL, Husgvarna and others will not work with cheap gasoline with a low octane rating. The suitable fuel for them is AI 92 or higher, from gas stations and then from well-proven ones, because gas stations also have bad gasoline. The use of high octane and quality gasoline will determine how long the lawnmower will be used and how long it will last.

We have to take into account one more fact that if you store a diluted fuel mixture for a long time, it reduces its performance, which also leads to the consequences when the lawnmower won’t start. Therefore, you have to dilute it in portions, that is, the amount of mixture that is produced at one time. The size of the petrol and oil mixture is clearly described and explained in the owner’s manual. Strict adherence to the correct proportions will at least save you from several questions, why the lawnmower does not start and what to do in such cases.

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The lawn mower starts and stops. What to do?

Spark is there and everything seems normal, but the lawnmower won’t start, in such cases you should check the air valve in the fuel tank. A clogged valve leads to a vacuum in the tank, in which the carburetor receives less gasoline, so the lawnmower will start, but then will stall. To rule this cause out, it is necessary to clean the valve and try to start the lawnmower with the cap of the tank not completely screwed in. 2. If the lawnmower does not start, you should remove and clean the fuel filter and check all the carburetor parts, and then try to start. The lawnmower won’t start again, the air filter is disconnected, try to start without it, if the lawnmower starts it means the air filter is the cause, replace it.

Lawn mower does not start, spark is gone

Lack of spark entails checking the contacts and the correct gap between them, the wire conductor to the spark plug and the spark plug itself. Test method spark unscrew the plug, connect a wire to it, put the plug sideways to the hood of the engine and several times to pull the starter as if winding up the lawnmower, while it is necessary to look at the angle and contact the plug, between them should run a spark. Take a new spark plug and do the same procedure. If you still can’t find the spark, it’s either in the wire or terminals.

Fix a Trimmer won’t idle for long then dies

Lawn mower does not start in cold

When starting a cold engine, it is not recommended to press on the gas. Tilt the lawnmower so that the air filter is on top, press the fuel suction button 5-6 times, set the function switch lever in the “start” position, pull the starter cord several times until the engine starts. After a few seconds of engine operation, disconnect the starting system.

lawn mower does not start when hot

If the lawnmower has recently been in operation and has not yet had time to cool down, but does not want to start. press the throttle trigger, pull sharply the starter cord several times until the engine starts and only then release the throttle trigger. If enough time has passed and the lawnmower has had time to cool down, then you have to start it as when it is cold. If the above methods have not helped, the lawnmower does not start, then it is worth to contact the service center.

Lawn care products repair and maintenance.

Specialized service center “Agrotehservice. warranty and post-warranty service of world manufacturers equipment! Attention! Information for users!

About the adjustment of the brushcutter carburetor: how to adjust and regulate with your own hands

Despite the high performance, mobility and unpretentiousness in the work, modern brushcutters can hardly be attributed to complex devices. Over time, any mechanism is subject to wear and tear, and therefore parts and components require the owner’s special attention. One such element of the grass trimmer is the carburetor, designed for the formation of the fuel mixture and its supply to the combustion chamber. Increased consumption with correct observance of the proportions of gasoline and oil or a drop in engine power indicate the need to adjust the carburetor gasoline trimmer for grass.

What could be broken

Malfunctions with a chainsaw related to this device not starting are classified in a certain way by service technicians. They stand out faults with the following nodes of the mechanism:

  • The engine, in which the piston and bearings can wear out or fail, crack the crankcase;
  • the fuel supply system, with a possible clogged filter or problems with the carburetor;
  • mechanical damage to the wires, tubes, hoses;
  • ignition circuit.

To correctly determine the node where the breakdown occurred, it is necessary to pay attention to the circumstances under which the grass trimmer stalls.

Why the lawnmower stalls: the most common causes, their diagnosis and elimination

If the gasoline grass trimmer (lawnmower, lawnmower) suddenly stalls, there is a serious reason.

Therefore, the unit must be carefully checked, then replace or repair defective parts.

Diagnostics should be carried out even if, after stopping, not associated with full fuel consumption, it was able to start without any problems.

After all, small faults gradually grow into large ones, so after a while the cost of repair will be much higher.

What to do if the lawnmower starts and stops?

Now let’s consider all the above problems in more detail.

In principle, there can be a huge number of reasons why the engine of a brushcutter stops working when you press the gas. Here we will consider only the most common.

You might have a clogged choke. And to solve the problem you just need to clean the air vent. Also the engine is stopped because of a clogged air filter. In order to clean it the filter should be firstly washed in solvent, and then blown with a stream of compressed air.

A similar procedure should be performed with a clogged fuel filter, which prevents the flow of fuel in the proper volume when the engine speed increases.

The engine can also stall for other reasons. First, the spacer, located between the cylinder and the carburetor is worn, and second, the crankshaft seals began to suck air.

We have already pointed out that in this case, the problem is in the carburetor. In it, due to increased temperatures, gasoline begins to boil, which causes the air-fuel mixture to stop forming or its quality is critically reduced.

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In addition, this problem may arise due to the fact that the carburetor is equipped with a rotary rather than a disc flap. If the problem has become chronic, it should be solved radically. by buying a new carburetor with a disc.

Most likely, the access to the fuel tank is obstructed or completely absent, which creates a zone of low pressure in it, due to which the engine ceases to receive fuel in the required quantity and because of this you stop working.

The engine may stall at idle for the following reasons:

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To fix most problems you will need spare parts, and the gasoline tool store “Well Part” is ready to provide them to you at the most favorable cost.

How do you start to diagnose the brushcutter?

If the lawn mower won’t start or cuts out straight away after starting, you need to check all the main components one after the other. Algorithm of checking is as follows:

  • Fuel tank (fuel quality);
  • The candle and the candle channel;
  • Air filter;
  • Fuel filter;
  • Breather;
  • Exhaust port.

These units are most often the source of major problems, which can be eliminated after a thorough inspection.

Check the fuel mixture

Before starting the engine of a gasoline grass mower, check the presence and quality of the fuel mixture. Do not save, do not be greedy and “do not be smart” in this matter. Repair or replace the piston group will cost you too much (sometimes up to 70 percent of the cost of a new tool). It is necessary to prepare an oil-fuel mixture strictly according to the instructions. Calculate its quantity from real needs. Excessive gasoline left behind loses its quality over time.

Do a diagnosis of the spark plug and spark plug passage

If the quality of the fuel mixture is not in doubt, and the lawnmower stalls when starting, the cause may be a primed spark plug. A usual spark plug wrench (for sure every motorist has one) and a spare spark plug will do for repair.

  • Unscrew the candle and wipe it clean;
  • Thoroughly dry it (do not ignite it);
  • Excess fuel in the chamber drain through the spark plug hole and dry it;
  • Clean the old spark plug from the soot with a file or a nail file;
  • We set the gap with a distance of 1 mm (you can check it with any coin);
  • Put everything back in place and try to start the grass trimmer.

Dry the channel for at least 30-40 minutes. Otherwise there is a risk of refueling and a new spark plug.

If the spark plug is working, the spark plug socket is completely dry and the lawn mower won’t start, lubricate the connection with petrol. It should be slightly moistened. No matter how good the spark is, there is nothing to light up in the dry chamber.

If the grass trimmer engine still does not start, you should exclude such a reason as the lack of spark due to weak contact between the candles and the high-voltage wire. If the connection is good, but there is still no spark, most likely you have a “broken” ignition unit. You can not do without a master here. к. the part is not repairable, but is sold as a complete unit.

Lawn mower filter diagnostics

Another reason why the gasoline grass trimmer stops, can be the air filter. To exclude it, try to remove the filter and start the trimmer for grass without it. If it works, then you’ll have to replace the air filter with a new one, or at least blow and thoroughly clean the old one.

Trimmer won’t stay running, fixed.

The gasoline grass trimmer may not start due to a dirty fuel filter. This is the next step in our algorithm. Here we check the condition of the filter element and, if necessary, replace it with a new one. When replacing, try not to leave the intake without a filter at all, this is forbidden in any instruction manual. Hurry may turn out to be a repair of engine piston group.

Breather and exhaust port

Often, “delicate” brand-name models of chain saws do not start and shut down due to a dirty breather. The main function of this element is to equalize pressure in the gas tank. When this unit is clogged, a vacuum is created in the tank, preventing the flow of fuel. Troubleshoot the problem by cleaning the breather. You can use an ordinary needle for cleaning.

Normal operation of the space with internal combustion engines can be disrupted by dirt in the exhaust channel or clogging the muffler grid. there is such a problem with older models. You can solve the problem by traditional cleaning and removal of the anti-sparking mesh.

What could be broken

Troubles with a benzosaw associated with the fact that this device does not start, are classified in a certain way by specialists of service stations. They stand out faults with the following nodes of the mechanism:

  • engine, which can wear out or fail the piston and bearings, crack the crankcase;
  • the fuel supply system, with the possibility of clogging the filter or problems with the carburetor;
  • mechanical damage to the wires, tubes, hoses;
  • ignition chain.

In order to correctly determine the node where the failure occurred, you need to pay attention to the circumstances under which the grass trimmer stalls.

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