Stihl Fs 38 Carburetor Adjustment

Chainsaw Stihl 180; device and adjustment of the carburetor
The main elements of the carburetor chainsaw Stihl MS 180. Methods of adjustment, removal, disassembly and repair. Troubleshooting tips.

Fuel pump

A fuel pump is installed directly in the carburetor body, which operates under the action of an air pulse from the crankcase of the chainsaw, which is transmitted through special channels. A diaphragm is installed in the pump, it is she who is responsible for pumping fuel under the action of an impulse. A gasket is installed between the diaphragm and the body, which is responsible for the tightness of the fuel pump.

Adjusting the Stihl 180 carburetor

The carburetor of the Stihl 180 chainsaw, indiscriminately, can only be adjusted by the number of idle revolutions. It is impossible to increase or decrease the fuel supply in different modes using special screws. The manufacturer restricts access to adjustments and does not install these screws. How to adjust the carburetor to the correct idle speed is described in great detail in the manufacturer’s instructions.

In the event of certain malfunctions, and with experience, it is possible to increase or decrease the fuel supply by increasing the clearance when opening the needle valve.

To increase the flow, the rocker arm of the needle valve in the distribution chamber must be bent up, and to decrease, down. This regulates the stroke of the needle and, accordingly, the throughput of the valve.

Dismantling the carburetor Stihl 180

In order to purge, change the gaskets or the needle valve, the carburetor must be disassembled. To do this, unscrew 4 screws on the expansion joint cover and one on the fuel pump.

Having opened the case, you should be extremely careful, because if debris gets inside the carburetor, it will make its work impossible. The thickness of the channels in it is comparable to the thickness of a thread or even a human hair.

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For the repair of the Stihl 180 carburetor, can be seen below. In it, the master tells in detail about the problems and clearly demonstrates the entire repair process.

Lawn mowers carburetor device

Stihl fs 38 carburetor adjustment

The basis of the carburetor for lawn mowers is an aluminum body. It contains a diffuser (hole with internal contours). Air is blown through this hole. The flow rate of oxygen (air) depends on the cross-section (orifice) of the diffuser.

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

Outside the carburetor is installed:

  • Fuel pump;
  • Jet system;
  • Fuel-air mixture control system;

Do-it-yourself lawn mowers carburetor adjustment

Lawn mowers, like all gas powered garden tools, are not difficult to maintain. It is possible and necessary to repair, configure yourself. For example, adjusting the carburetor of a lawn mower with your own hands is a matter of five minutes.

A lawn mower carburetor is a unit in the power system. In it, like any carburetor, there is a process of mixing air and fuel (gasoline) for further supply to the engine cylinders.

The main problems and malfunctions of the carburetor.

Mesh filter. There are often only two problems with this element:

  1. Blockage.
  2. Breaking.

In order to find out the cause of the breakdown, the fuel filter cap is unscrewed to remove the strainer. If dirt just accumulates on it, then flushing in gasoline or blowing will help.

If there is visible damage to the mesh filter, it is imperative to install a new one. There may also be damage to the fuel supply pipe (during repair, they practice checking this element).

The carburetor starter in most cases does not function due to blockages. Use acetone or the same gasoline for flushing.

Blowing compressed air into clogged carburetor parts is an acceptable and convenient repair practice.

DIY Stihl trimmer repair and operating instructions FS-38 and 55 (Stihl FS), carburetor adjustment

It is inherent in man to ennoble the place in which he spends the lion’s share of his time. Residents of cities resort to the services of designers, or they themselves try to change something in their home, buy new furniture, wallpaper, so that when they come home after a hard day, they can mentally rest and relax in a favorable environment. Residents of their own homes outside the city have completely different concerns and requirements. It is necessary to mow shrubs, grass, various dead wood in a timely manner, carefully monitor the condition of the personal plot and garden. It is clear that this requires slightly different means of achieving comfort. And here a new brainchild of engineering comes to the fore – mowers from Stihl.

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Petrol lawn mower FS 38

The model is distinguished, first of all, by its simplicity and compactness, which is quite enough for proper maintenance of the local area. The main control keys are located on the handle of the device, which greatly facilitates and speeds up the work.

  • Engine power – 0.9 hp;
  • Engine volume – 27.2 cm3;
  • Tank volume – 0.33 l;
  • Engine type – two-stroke;
  • Barbell – straight;
  • Handle – D-shaped;
  • Complete set – 2-toothed grass trimmer blade, protective goggles, belt;
  • Weight – 4.1 kg.

This model is one of the most popular on the market! You will learn about all the units that are included in the rating of the best lawn mowers here.

Stihl FS 70 mower price

She is over an improved model featuring higher power and multitasking. An anti-vibration system is provided to significantly reduce the impact of a running engine on the handle.

FS 70 features:

  • Engine power – 1.2 hp;
  • Engine volume – 27.2 cm3;
  • Tank volume – 0.34 l;
  • Engine type – two-stroke;
  • Barbell – straight;
  • Handle – T-shaped;
  • Complete set – belt, reel with fishing line;
  • Line diameter – 2.4 mm;
  • Weight – 5.4 kg.

Specifications and features

  • Mowing width: 23 cm;
  • Fuel tank capacity: 0.33 l;
  • Weight: 4.1 kg;
  • Bar: curved;
  • Line thickness: 2 mm.

Thanks to the manual fuel pump, a person can easily pump fuel into the carburetor. This is especially important in a situation where the mower has been idle for a long time. Constantly adding fuel will allow you to quickly start the device even after a "long vacation".

For other useful information, see the following document:

The curved bar of the STIHL FS 38 lawn mower with a rounded handle is worthy of attention. Thanks to this design, the device easily copes with the cleaning of the territory, even in narrow or confined spaces.

All controls are located on a comfortable handle, so it takes a long time to look for where and what to switch is not necessary. During work, such a moment is very important, because the operator can not be distracted and adjust the operation of the machine without unnecessary movements.

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The STIHL FS 38 trimmer – a functional unit you can trust

The STIHL FS 38 trimmer is probably familiar to all fans of quality garden equipment. People who have once experienced the brand’s products in practice rarely switch to products from other brands, because German quality conquers completely and completely.

This lightweight gasoline device is quite compact, it is ideal for cleaning small backyard areas. Many private sector owners prefer this particular “helper”, because it does an excellent job and demonstrates a high level of productivity.

0.9 liter two-stroke engine from. Can handle heavy loads and the AutoCut mowing head can handle even relatively tall bushes and weeds. The D-handle easily adjusts to the height of the operator, so the new owner will be able to adapt the unit completely to himself.

Since the engine displacement is 27.2 cm 3, the Stihl FS 38 trimmer can reach a fairly high speed. The presence of a special quick start system eliminates the need to start the unit several times in a row, because it will start working on the first try.

Adjusting the carburetor lawn mowers Stihl FS 38

  • First you need to stop the engine;
  • Then install the mowing head;
  • The next step is to check the air filter, and if the filter element is not in good condition, it should be replaced;
  • It is necessary to completely turn the idle speed adjusting bolt clockwise until it stops, and then 1.5 turns counterclockwise;
  • After starting the device, you should wait until the engine warms up;
  • Using the idle stop bolt, the owner must correct the idle speed to immobilize the cutting tool.

It is not difficult to deal with all the procedures, the main thing is to get serious about the matter and tune in to work. over, many owners note that you can independently carry out not only tuning the carburetor, but also replacing parts. Downward-looking schemes will be excellent assistants in this matter.