STIHL fs 55 starts and stops

STIHL Fs 55 Lawnmower Won’t Start Causes

The machine is a complex piece of technology, despite its small size. If you study the instruction manual, it turns out that the reasons why the gasoline pump does not start are known and eliminated. You need to consistently rule out factors that make it difficult to start the tool. These usually start with the more accessible components with a simple maintenance check.

Correcting problems

All reasons why a gasoline pump should not be started can be classified according to the specific operation of the individual units. The service center classifies the malfunctions:

  • engine malfunction (piston wear, bearing failure, cracked crankcase);
  • Faulty fuel supply. the air filter pores are clogged or the carburetor is malfunctioning;
  • the ignition system does not work;
  • mechanical failure. Hose leaks, punctured wires under the braid, burst pipes.

First, the user needs to check the presence of fuel in the tank. Start according to the instructions by placing the saw on its side. The air damper should be set in the closed position, refuel, turn on the ignition and make 3-4 sharp jerks with the starter. If the engine starts, open the choke. Don’t run the gasoline pump. Repeat the operation with the choke slightly open.

Mower may not run for long. and the engine is overheating. Mowing can be no more than 15 = 20 minutes, taking a five minute break. On a hot afternoon, the run time is halved. When cutting weeds, sedges, work time should be shortened.

stihl, starts, stops

If the start-up fails, we start looking for the cause of the malfunction:

  • check the fuel quality;
  • to ensure the effectiveness of the spark plug and cleanliness of the spark plug passage;
  • check that the air filter is clean;
  • make sure the fuel filter is not blocked;
  • check the cleanliness of the break;
  • Clean the exhaust duct.

complex causes will be found when diagnosing a malfunction leading to a carburetor overhaul. These reasons include clogging of carburetor internal passages, wear of gaskets on the carburetor and failure of internal halls with loss of vacuum. Repairing the gasoline pump yourself if it won’t start will require patience.

Fixing the cause of not getting the gasoline pump

The fuel mixture should be prepared with the exact proportions of gasoline and oil. In this case you cannot use another brand of fuel. To keep dirt out, leave gasoline in a cup or metal container for at least 2 days. Do not use plastic containers to store fuel. Oil is measured accurately with a medical syringe without a needle. Use only freshly made mixture, do not leave spent fuel in the tank. If the engine is unruly, the gasoline stops when you press the gas, it’s probably the fault of the fuel.

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STIHL FS 55 lawn trimmer mower Doesn’t rev, stops, rebuild carburettor

STIHL FS 55 lawn trimmer mower Doesn’t rev, stops, rebuild carburetor Thank you for watching

Repairing the carburetor of the STIHL FS55 lawnmower

Replacing the o-ring, gas pedal in the carburetor of STIHL FS55 lawnmower (gasoline lawnmower).

Stihl FS 55RC trimmer won’t start fix

stihl, starts, stops

Gasoline does not start when hot. Pull the throttle trigger and pull the cord sharply several times until the engine starts, then squeeze the trigger. Do not start. requires specialized repair.

Check the ignition system if the gasoline pump does not start in sequence:

  • Remove plug from carbon and dirt, dry it, set the gap of 1 mm;
  • connect to the high voltage wire and check the spark by pulling the starter several times;
  • if there is no spark, check the integrity of the high-voltage wire;
  • replace the spark plug;
  • dry the spark plug passage;
  • At the same time check the operation of the ignition coil, it is faulty if the working plug does not spark.

In case of malfunction, the ignition coil of the gasoline pump does not start hot, kiosks, runs intermittently.

Cleaning or replacing the air and fuel filters will ensure the proper flow of ingredients going into the carburetor. Air filter can be washed in soapy water or replaced. If nylon cloth is used, it is washed, the porous felt filler is replaced. The fuel filter is changed carefully, leaving the intake nozzle open. Does the air filter need to be replaced, can the engine be started with the air cleaner removed. Do I need to change the screen on the fuel supply if the gasoline pump won’t start, a dry spark plug will tell you.

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Breather, air inlet to gas tank. If it is clogged, a vacuum is created in the tank and the mixture does not enter the carburetor. The hole can be blown with air or cleaned with a needle. The exhaust duct must be cleaned, the muffler’s wiping mesh must be removed.

Adjusting and adjusting the carburetor

Maximum and minimum engine speed, regulated by the carburetor. Stable operation of the fuel pump depends on the amount of fuel mixture and supplied air, as well as their ratio. Gasoline will not start if the carburetor is not properly adjusted. Low speed (L), high speed (N), and (T) fuel setting is adjusted with the same screws:

  • The chainsaw must be operated for at least 10 minutes, because the adjustment is hot.
  • Turn screw H gently to maximum speed, then turn 1/4 counterclockwise, reduce the speed of the motor shaft.
  • The idle speed is adjusted with the T screw, ensuring that the grasshopper does not rotate.
  • Adjust the L screw by first opening the maximum throttle and then gradually reducing the speed to a steady minimum.

After adjustment, a good carburetor with cleaned filters, checked ignition should ensure the engine runs. If the carburetor malfunctions after repairs, the feed system must be adjusted again before starting the gasoline pump.

Rare breakdowns that interfere with gasoline pumps can be:

The most common malfunction that involves replacing the engine can be a piston engine group failure. The cost of repairs will cost about 70% of the product. To understand the reasons why the gasoline pump does not start, the video will help:

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Proper chainsaw care

There are no superfluous phrases in the operating instructions, everything that is suggested is aimed at keeping the gasoline pump running smoothly. Cleaning all parts after each cycle makes it easier to remove uncured residue and dirt. Clean only cooled assemblies. This method contributes to the quality of air cooling of the engine and transmission.

You should use fuel with the recommended oil in the instructions for refueling. If the fuel mixture remains in the fuel tank, the oil will float and, at start-up, land on the damper, impairing its adjustment. Mixture may settle and clog fuel in carburetor.

When saving the equipment for the winter, inspect, lubricate the gearbox and piston system, wrap the entire saw in an oiled rag and store it in a dry place.

It is impossible, dangerous to the tool and the health of the mower, to use a metal cable instead of a fishing line. It cuts more efficiently, but the load on the gear and motor increases. A worn piece of wire flies at the speed of a bullet during disengagement. Efficient mowing can lead to rapid wear of the engine piston group. For more effective mowing it is suggested to use the star line profile.

Why the lawnmower won’t start Troubleshooting

Caring for the homestead, dacha owners periodically encounter the fact that the lawn mower does not start. There are many reasons for tool failure. For proper diagnosis of the problem, the owner of a useful dacha unit needs to know the structure and operation of its individual parts.

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