STIHL Fs 38 carburetor adjustment

The use of gasoline pumps in gardening operations involves wear and sometimes breakage of its mechanisms. But since this tool can not be attributed to complex household appliances, all failures are purely mechanical, which can be corrected with your own hands. In some cases, it is sufficient to make adjustments that return the instrument to normal operating condition. One such operation is to adjust the carburetor in manual mode. The job of the carburetor. mix air and fuel before filling the engine. And if the proportions do not match, the grass trimmer will have visible faults:

The whole process of adjusting a motorcycle carburetor involves just adjusting the position of the three screws: L. Adjustment of gasoline supply to the mower at low rpm, H. adjusting speed and fuel flow, T. idle speed. Thus, if you need to configure the carburetor line 54 casting gasoline or other types of this series, the following steps are performed:

  • The engine warms up (10 minutes is sufficient).
  • Adjust screw H by turning left/right to maximum idle speed.
  • From the point found, turn it counterclockwise 1/4 turn, which will set the desired operating position.
  • Mower speed adjustment is the same, turning counterclockwise (speed reduction) and clockwise (speed increase). Reached the position of maximum stability of the motor in different positions.
  • Screw L is adjusted in the same way, with low revolutions to the maximum.

Therefore, the entire process is done by ear, so a tonometer should be purchased for more successful operation. The most accurate maintenance of the tool is available from Kosa Motors, as well as to buy oil for the compressor and to buy all the necessary parts and components for timely maintenance.

Factory specifications

The STIHL ride-on mower in this configuration is distinguished by its solid factory settings.

The grass trimmer’s specifications include:

  • standard engine cylinder volume. 27,2 cm3;
  • standard engine power. 0,9 l. с.;
  • Fuel tank capacity is 330 ml;
  • fuel consumption at high load. 320 ml/h
  • Maximum cutting diameter with a fishing line is 38 cm;
  • cutting diameter when using a knife. 25,5 cm;
  • maximum sound pressure when working with a metal blade. 109 dB.

The STIHL FS 38 grass trimmer is small and lightweight. It has a ready-to-use weight of 4.1 kg and an unladen length of 147 cm.

Grass trimmer carburetor adjustment

The STIHL FS38 petrol mower is as easy to operate as it can be. However, in order for the tool to work properly as long as possible, its owner needs to pay attention to the settings of the grass trimmer carburetor. This not only affects how much fuel you use, but also the amount of strain on the brushcutter’s main components.

To adjust the carburetor of the STIHL grass trimmer, proceed as follows:

  • First you need to stop the engine and set the mowing head on it. this is necessary in order for the motor to work under a certain load when adjusting;
  • Then the air filter must be checked. If it cannot be cleaned, the filter element will need to be replaced;
  • Then you need to check the grid that protects the inner parts of the brushcutter from sparks;
  • After that, you need to turn the bolt L, responsible for the no-load riding lawnmower, in a clockwise direction until the stop. Immediately thereafter, the bolt must be turned 1.5 turns in the opposite direction;
  • Next, you need to start the grass trimmer motor and let it warm up;
  • At the end, the position of the adjusting bolt marked LA must be set so that the mowing head on the trimmer does not rotate.

When all the steps are done, you need to stop the engine of your brushcutter and restart it.

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CARBURATOR ANALOGES FOR STIHL FS 38 lawn mower (grass trimmer)

popular parts for STIHL FS 38 lawn mower (grass trimmer)

Repair carburetor for STIHL FS 38 lawn mower (grass trimmer) you can buy at Zip4Tools online at a price of 1 510 with delivery in MOSCOW (Moscow).

Removing the handle

Disassembling the STIHL 180 begins with removing the handle, which is attached to the STIHL by three rubber buffers. To remove it, you must remove the plastic plugs from the inside cavity of the shock absorbers, then using a strong screwdriver, first press out the upper shock absorber, then the one closest to the rear handle.

In the back of the handle is installed throttle trigger, which is connected to the carburetor through a wire rod, in order to disconnect the rod from the throttle trigger, it is necessary to unscrew two screws and disassemble the handle.

When the handle remains on one shock absorber, it is necessary to unscrew the body of the chainsaw from the inner part of the handle and, breaking aside, remove the body from the last rubber.

Design of the STIHL FS 38

STIHL brand mowers are known for their good factory-assembled quality and excellent selection of components. In the base of the model is a 2-stroke gasoline engine, located in the upper part of the reinforced plastic housing. The engine has a forged piston and a long-life cylinder, the inner and outer walls of which are protected with an alloy of chromium and nickel.

The improved manual starter with decompression system, an auxiliary pump for fuel pre-charging and the proprietary electronic ignition system are responsible for the engine starting and consistent operation in all weather conditions. This factory-assembled design makes cold starts smoother and quicker, and prevents excessive piston wear.

Beside the engine of the brushcutter there is a semi-transparent plastic tank for filling the mower with fuel. Bottom of tank has metal ribs to protect tank from damage.

The STIHL FS 38 features a curved, indestructible mower bar that makes it easy to catch grass and weeds under benches, around trees and in other hard-to-reach places. There is a flexible drive shaft inside the shaft which connects to the gearbox and transmits the motor power to the gearbox.

Gearbox of the mower is made of chromium-alloyed aluminium to protect against rust and overheating. A hole in the gearbox enables the operator to easily lubricate the sliding parts of the assembly.

How to fix a Stihl FS38 weedeater with carburetor problems fast cheap and quick

For more comfortable operation, the STIHL FS 38 grass trimmer has an ergonomically designed 2-arm D-handle whose position, if necessary, can be adjusted along the entire length of the boom. The manufacturer has equipped the model with a durable fabric shoulder strap, which is attached to the boom with metal carabiners.

Operating instructions

The STIHL FS 90 lawnmower must be used safely. Exercise caution when working. This requirement is due to the high rotational speed of the cutting tools. If you do not plan to use the equipment for a certain period of time, it should be installed so that it does not pose a potential hazard. Protect the machine against unauthorized use.

The machine operates producing a certain amount of noise. Therefore, the operator must wear hearing protection. Before turning on the device, it is important to wear clothing, elements of which could not catch on moving parts, bushes or trees. Ties, shawls and any jewelry should be removed.

Repair of lawn mower with their own hands: a breakdown of faults and methods of elimination

Today, almost every gardener-gardener has in his arsenal of garden equipment gasoline tools, among which the gasoline trimmer for grass takes one of the first places. But is everyone familiar with the design of the lawnmower as necessary for its most useful operation? It’s no secret that you only need comprehensive information about your machine to fully exploit its potential. Let’s understand what a gasoline trimmer for grass consists of and how each of its structural component works.

Lawn mower design

Schematically, the device of the lawnmower can be represented as a rod, on both sides of which there are functional elements. In the lower part there is a gearbox unit and in the upper part there is a power unit. To control the tool, a handle is reinforced on the boom, the position of which can be adjusted. There is also a special belt (it can be of different types) for unloading the operator, which distributes the weight of the tool. Let’s take a closer look at each element and the functions it performs.

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