Gas Trimmer Stalls At High Speed

Gas Trimmer Stalls At High Speed

The tool, despite its small dimensions, is a complex technical device. If you study the operating instructions, it turns out the reasons why the brushcutter does not start are known and can be eliminated. Factors that make it difficult to start the tool must be consistently eliminated. Usually they start with more accessible nodes with easy health checks.


All the reasons why the brushcutter does not start can be classified according to the specifics of the operation of individual nodes. In the service center, malfunctions are classified:

  • Engine malfunction (piston wear, bearing malfunction, crankcase crack);
  • Fuel mixture failure. Clogged air filter pores or carburetor malfunction;
  • The ignition system does not work;
  • Mechanical failure. Leakage of hoses, broken wires under the braid, tube rupture.

The user first needs to check if there is fuel in the tank. Start up in accordance with the instructions, putting the saw on its side. Set the air damper to the “closed” position, pump up fuel, turn on the ignition, and make 3-4 sharp jerks with the starter. If the engine is running, open the air damper. The brushcutter does not start. Repeat the operation with a slightly open choke.

Lawn mowing cannot work long. The gearbox and engine will overheat. Mowing can be no more than 15 = 20 minutes, making a five-minute break. At sultry noon, the operating time is halved. When mowing weeds, sedge, the working time is required to be reduced.

If the launch fails, we begin to search for the cause of the failure:

  • Check fuel quality;
  • Make sure the candle is working and the candle channel is clean;
  • Check the cleanliness of the air filter;
  • Make sure the fuel filter is not clogged;
  • Check the purity of the breather;
  • Clean the exhaust duct.

Complex causes will be found in the diagnosis of malfunctions, leading to a major overhaul of the carburetor. Such reasons include clogging of the internal channels of the carburetor, wear on the gasket and violation of the tightness of the internal halls with a loss of vacuum. Do-it-yourself repair of the brushcutter, if it does not start, will require patience.

Elimination of the reasons why the brushcutter does not start

The fuel mixture must be prepared with exact proportions of gasoline and oil. In this case, you can not use a different brand of fuel. To prevent the ingress of dirt, gasoline should be left in a glass or metal dish for 2 days. Do not use plastic containers to store fuel. Measure the oil accurately with a medical syringe without a needle. Use only freshly prepared mixture without leaving undeveloped fuel in the tank. If the engine is naughty, the brushcutter stalls, when you press the gas, fuel may be to blame.

The brushcutter does not start on a hot one. Pull the trigger and sharply pull the cord several times until the engine starts, then lower the trigger. Does not start. Requires specialized repair.

Checking the ignition system, if the brushcutter does not start, is carried out sequentially:

  • Remove the removed candle from soot and dirt, dry it, set a gap of 1 mm;
  • Connect to the high-voltage wire and check for a spark by pulling the starter several times;
  • If there is no spark, check the integrity of the high-voltage wire;
  • Replace the candle;
  • Dry the candle channel;
  • At the same time, the operation of the ignition coil is checked, it is faulty if the working candle does not spark.

It is in case of a malfunction of the ignition coil that the brushcutter does not start up hot, stalls, works intermittently.

Cleaning or replacing the air and fuel filters will ensure the necessary flow of ingredients entering the carburetor. The air filter can be washed in soapy water or replaced. If a nylon fabric is used, it is washed, the porous felt filler is replaced. The fuel filter is changed carefully, without leaving the suction pipe open. Is it necessary to replace the air filter, you can determine if the engine with the removed air purifier starts. Do I need to change the grid on the fuel supply, if the gas mowing does not start, a dry candle will tell.

Breather, air inlet for gas tank. If it becomes clogged, a vacuum is created in the tank and the mixture does not enter the carburetor. The hole can be purged with air or cleaned with a needle. Clean the exhaust channel, remove the spark retardant silencer mesh.

Carburettor Adjustment

The maximum and minimum engine speeds, even idle speed are regulated by a carburetor. The stable operation of the brushcutter depends on the amount of the supplied combustible mixture and air, their ratio. The brushcutter will not start if the carburetor is not properly adjusted. The procedure for setting up the device for supplying fuel at low revolutions (L), high revolutions (N) and idle (T) is regulated by the screws of the same name:

  1. The chainsaw should work for at least 10 minutes, as the adjustment is carried out hot.
  2. Turn screw N smoothly to maximum speed, then turn it by ΒΌ, counterclockwise, reducing the speed of rotation of the motor shaft.
  3. Idling is regulated by screw T, ensuring that the braid does not rotate.
  4. The screw L is adjusted, first opening the throttle as much as possible, and then gradually reducing the speed to a stable minimum.

After adjustment, a working carburetor with cleaned filters, tested by ignition should ensure the operation of the engine. In the event of a carburetor malfunction, after its repair, the feed system will need to be adjusted again before starting the brushcutter.

Rare breakdowns that interfere with the operation of the brushcutter can be:

  • Rewind spring malfunction;
  • A broken or stuck starter pulley;
  • Faulty starter assembly.

The most important malfunction, the elimination of which is associated with the replacement of the engine, may be the failure of the piston group of the engine. The cost of repair will cost about 70% of the cost of the product. To understand the reasons why the brushcutter does not start, the will help:

Proper Chainsaw Care

In the instruction manual there are no unnecessary phrases, everything that is offered is aimed at trouble-free operation of the brushcutter. Cleaning of all parts after each cycle of work contributes to the easy removal of uncured residues and dirt. Only the cooled components need to be cleaned. This technique contributes to the quality of air cooling of the engine and gearbox.

For refueling, use fuel with the oil recommended in the instructions. If the fuel mixture is left in the fuel tank, the oil will pop up and, upon start-up, will land on the damper, impairing its adjustment. The mixture may precipitate and clog the fuel in the carburetor.

When preserving equipment for the winter, carry out an audit, lubricate the gearbox and piston system, wrap the entire saw in an oiled rag and store in a dry place.

It is impossible, it is dangerous for the tool and the health of the mower, to use a metal cable instead of fishing line. It cuts more efficiently, but the load on the gearbox and motor increases. A worn piece of wire flies with a bullet at breakaway. Effective mowing can lead to early wear on the engine piston group. For greater mowing efficiency, it is proposed to use an asterisk fishing line profile.