Grass trimmer at high revs throttles

What to do if the fuel mixture used is fine, but the gasoline grass trimmer still won’t start? The causes of failure may be due to excessive moisture in the spark plug channel. To make a diagnosis and fix the problem you need to do the following

  • Unscrew the spark plug. Wipe it thoroughly and then dry it.
  • Drain the excess fuel in the chamber through the appropriate spark plug hole.
  • Clean the old plug, if it has soot on its surface. To cope with the task will allow the use of an ordinary nail file or file.
  • When reinstalling the element set the gap of 1 mm. To check the parameter, it is enough to put any coin in the gap.
  • Reassemble the functional unit.
  • Try to start the trimmer for grass.
grass, trimmer, high, revs

It is recommended to perform drying of the spark plug channel for at least half an hour. However, in no case should you resort to the burning of its elements. After all, heating of the spark plug can lead to its final damage. What to do if the function block has been serviced according to the above recommendations, but the grass trimmer does not start, there is a spark? In such a case, it is worth to treat the threaded connection with gasoline. The latter does not need to be heavily soaked in fuel. It should only be slightly moistened. Resort to such actions should be used to ensure ignition. After all, no matter how strong the spark did not give the spark plug, in a completely dry chamber simply will not ignite.

The lawnmower stops or suffocates when the throttle is depressed

If even in this case, the grass trimmer does not start, it is worth evaluating the quality of contact between the high-voltage wire and the spark plug. If there is no spark (if there is a reliable connection between the above elements), most likely the problem is caused by a breakdown of the ignition unit. In this situation, you will need to seek the services of craftsmen who will perform the reinstallation of the node.

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The gasoline grass trimmer stops when idling

If the engine speed is too low, the brushcutter engine frequently shuts down and will not idle on restart. The main causes of such failure include pollution or misadjustment of the carburetor, as well as clogging of the air filter.

If the optimal settings of the carburetor are violated, it is necessary to perform its cleaning and re-adjustment. You can cope with the clogging of the air filter of the grass trimmer by placing it for a few hours in a solution with an ordinary household detergent. If cleaning by yourself does not solve the blockage, it is better to buy a new filter element in accordance with the instruction manual.

After carrying out measures the user for a long time will not face the situation when the grass trimmer stalls at idle and functions only when gas is supplied.

Troubleshooting by professionals

The service station is not only a car, but also a garden-technique. Generally call for service if the piston and carburettor are defective. Why and from what does not start the gasoline lawnmower in these cases determined by the masters:

  • Damage to the integrity of the machine or individual components. using a pressure gauge, find the affected area and seal it.
  • Clogging of channels, jets. elements are blown with air, cleaning liquids are used.
  • Worn pistons, gaskets. produce a replacement part assembly.

How To Fix High Idle Echo Gas Trimmer | GT-225 | Tight Throttle Cable

When opening the choke

It happens that the unit stalls when the air damper is opened, while normally idling. This is due to air suction by the system, caused by the presence of cracks in the fuel hose or problems with the seals. Also the carburetor metering system may malfunction, and the lawnmower will stop after opening the flap.

grass, trimmer, high, revs

All possible causes of the lawnmower stopping, and ways to fix them are contained in the following video

grass, trimmer, high, revs

There are many reasons for stopping the brushcutter, but the most common cause is carburetor malfunction. They can occur in any case. The most problematic variant is when a serious breakdown occurs, and it will be necessary to buy new parts or to change the lawnmower.

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In order for the grass trimmer to work properly for a long time, it is necessary to strictly follow the requirements of the instruction manual. It is necessary to fill the machine with a fuel mixture suitable for its composition, the device should work at a moderate load.

Adjusting the carburetor when the engine stalls at revs

if the checkup shows that the fuel system, the muffler and the spark plug are fine, it means that you have to look for the damage in other places. Do not rush to disassemble the piston/cylinder group or change the carburettor first. Repair is recommended to begin with the adjustment of the carburetor. For this, all chainsaws have special adjusting screws. They are designed for adjusting the idle speed, as well as adjusting the fuel supply at low and high revs. A detailed description of how to adjust the carburetor of a chainsaw, described on the site.

Today we will consider the peculiarities of tuning the carburetor at maximum rpm. Make sure that the chainsaw does not develop full power, you can use the tachometer. If there is no device, you can check whether the engine does not develop the maximum speed by ear. We are interested in the screw on the carburettor. Which is designed to adjust the high revolutions. It is usually marked with a Latin letter “H”, which is short for “High” (high or large).

To adjust the high RPM of the chainsaw, you will need to do the following manipulations:


  • Screw the screw H in a clockwise direction up to the stop
  • Then loosen the carburettor by 1,25-1,5 turns
  • Start the tool and test the revolutions
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It is recommended to adjust the tachometer, but if it is not available, you can check the maximum revolutions by working with the tool under load.

After a trivial adjustment of the carburetor, you can fix the problem with the termination of the work of the motor at higher revolutions. It should be noted that it is necessary to adjust the carburetor of a chainsaw regularly, depending on the frequency of operation of the tool. Make it yourself is not difficult, but to achieve accurate adjustment can be in one case. if you use a tachometer.

Grass trimmer does not start on hot: reasons, what to do?

After trimming for a short time, many people get confused: the tool loses speed and stops. Then it is almost impossible to start it while it is hot, and you need time for the gasoline tool to cool down a little.

Trimmer power loss at full throttle

The problem is usually with the carburetor or the ignition system if the grass trimmer will not start when hot. As for the carburetor, it is not uncommon for the fuel mixture to boil or for air to get into it.

If the grass trimmer begins to stall at high revolutions, the problem is most often in clogs or improper adjustment of the carburetor. It is necessary to pay attention to the fuel filter, whether it is not clogged and lets enough air through.

The problem may also be due to a cracked fuel hose. The problem is especially acute after storing the grass trimmer in unsuitable conditions.

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