How To Adjust Carburetor On Carver Trimmer

Elimination methods

The list of upcoming work on the engine may be as follows:

  • replacement of the fuel pump;
  • disassembly and flushing of the strainer;
  • replacement of the adjusting lever;
  • it is also necessary to clean the adjustment space;
  • replacement of the membrane (or the entire block where this membrane is located);
  • adjusting the inlet, outlet and needle valves;
  • replacement of dampers;
  • cleaning fuel channels and diffuser;
  • replacement of screw springs;
  • change of primer.

Not all of this work can be done. Often it turns out that many of them are not needed if a specific malfunction is immediately detected.

adjust, carburetor, carver, trimmer

Broken primer

Primer. a hand-held mini-pump for forced pumping of fuel into the carburetor. For a successful start of the engine, it may be necessary to pump 20 ml of gasoline manually.

Intake control lever is sticking

Jamming of the adjusting lever is a consequence of its incorrect installation, accidental bending. The contacting face will get the wrong position. This will disrupt the additional injection of gas.

Damper worn out

The throttle and air damper become unusable due to the ingress of dust, metal particles, etc. with the air flow. Damaged dampers are similar to parts that have been blasted with sand. Due to wear on the dampers, the efficiency of the motor decreases, and breakdowns are detected. Piston and cylinder wear out.

The dampers become unusable due to improper maintenance of the air filter or its breakdown.

In some cases, this filter is simply not suitable for your lawn mower or trimmer model. In the end, the motor shaft will suffer. its pieces fall into the engine channels, causing the piston to be broken.

How to adjust the carburetor of lawn mowers?

  • Carburetor device
  • Principle of operation
  • Major problems
  • Elimination methods
  • Adjusting the carburetor on the lawn mower

a lawn mower or trimmer, despite its relative simplicity (compared to a car engine), sooner or later fails. There comes a time when long downtime and restarts of the gasoline unit cannot be avoided. maintenance is needed. In advanced cases, repair is required, or rather, replacement of worn-out parts with the same new ones. Until you are faced with the need to replace your spent parts, carburetor maintenance is required. cleaning, rinsing, reconfiguring mechanisms.

Carburetor device

lawn mower (lawn mower) contains a base. a body made of aluminum, which houses the rest of the parts, working harmoniously as a whole. There is a diffuser in the carburetor body. a stroke with internal channels through which air is pumped.

The larger the cross-section of the diffuser, the more actively oxygen is supplied together with air. an oxidizer, in which the fuel is burned (gasoline-oil mixture).

Channels branching off from the diffuser stroke deliver fuel, with which the forced air mixes, entraining gasoline vapors with it. Outside the main carburetor compartment are located:

  • jets;
  • mini fuel pump;
  • unit regulating the mixing of fuel with air.

The latter forms the very explosive mixture ignited in the carburetor combustion chamber.

Strainer clogged

Reasons for blockage of the mesh filter. poor-quality fuel cleaning, damage to the hose and / or delivery head.

Major problems

Malfunctions of the carburetor lawn mowers or trimmers, despite the relative ease of their elimination, sometimes require a long search by the elimination method. The main reasons are:

  • unsatisfactory quality of gasoline purification;
  • air filter clogging;
  • accumulation of deposits and carbon deposits in the compartments and passages of the carburetor.

Each of the problems has its own reasons.


How to adjust the carburetor on the trimmer yourself

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Mechanic at home: adjusting the carburetor of a chainsaw with your own hands

Any internal combustion engine requires periodic maintenance, It doesn’t matter if it is the engine of a simple moped or a powerful multi-ton tractor. Such a tool as a chainsaw was no exception. After all, it is equipped with a single-cylinder two-stroke internal combustion engine, which also requires serious maintenance, although it is much easier to perform the necessary actions here. In today’s article we will talk about how to adjust the carburetor of a chainsaw with our own hands, find out how difficult it is, and figure out whether you need to be a professional mechanic to do this kind of work.

How does a chainsaw carburetor work, on what principle does it work

Modern car engines are no longer equipped with a carburetor. Meanwhile, before, almost every driver knew how to adjust it. Today, chainsaws with injection engines have already begun to appear on sale, however, carburetor models will hold the palm for a long time, because their cost is 5-15 times lower than that of the modernized version.

The carburetor consists of several main parts:

  • aluminum body;
  • diffuser and air damper at the inlet;
  • nozzles (valves for adjusting the fuel supply);
  • atomizer (it is he who provides injection);
  • fuel (float) chamber.

The principle of operation of a chainsaw carburetor is quite simple. Fuel is supplied continuously, and its quantity is regulated by jets. Air enters through the air damper due to the air vacuum generated by the piston. The diffuser mixes fuel and air. It is this fuel-air mixture that enters the cylinder, forcing the engine to work.

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How to adjust the carburetor on chainsaws

To understand how to properly adjust the carburetor on a chainsaw, you need to see it, and therefore we invite the reader to pay attention to the example below.

To make the adjustment, you only need a slotted screwdriver, however, it will not be possible to perfectly fine-tune the carburetor without a tachometer (of course, if the person is not a minder or a professional driver with experience). Now let’s try to understand how to set up the carburetor in a given situation.

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Determining the need to adjust the carburetor on a chainsaw

Before you start adjusting the carburetor on a chainsaw, you need to make sure that it is generally required. It would seem an absurd phrase. However, in 90% of cases, when an inexperienced craftsman considers such an action necessary, the unstable operation of the instrument is associated with other reasons, including:

  • problems in fuel lines and filter. blockages, depressurization;
  • malfunction of the exhaust system;
  • clogged or damaged air filter;
  • unstable operation of the ignition system;
  • violation of the tightness of the crankcase of the internal combustion engine.

Only if these problems are excluded, and the engine is unstable, it is safe to say that carburetor adjustment is required.

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How to set up a chainsaw carburetor if it won’t start at all

Quite a common problem in those cases when the “master” from the “I know everything” series tries to get into the settings with hands that do not grow from the shoulders. In such a case, there are standard screw positions from which you can “dance” further. First, you need to completely tighten both screws (do not overdo it). Then unscrew:

  • screw L. one revolution;
  • screw H. one and a half turn.

With regard to the idle screw, the throttle must first be completely closed (screw T unscrewed). After that, it must be cranked one and a half turns clockwise and try to start the engine. If it did not work out, it is gradually added by a quarter of a turn before starting. When the engine starts to work, the position of the idle screw is adjusted so that the internal combustion engine does not stall, but the chain is still in place.

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How to correctly and accurately adjust the carburetor: step by step instructions

In order to make the information easier to perceive, we propose to consider it on the basis of photo examples with a description of actions in tabular form. The basis is a chainsaw with initial settings.

You can learn more about the master class on adjusting the carburetor of a chainsaw in this video.

The main components of the Carver carburetor

The chainsaw carburetor consists of the following main components:

  • cast body made of light alloy;
  • diaphragm pump for manual pumping of fuel before starting (suction);
  • diffuser;
  • jets (strictly calibrated holes in bronze bushings for metering fuel supply);
  • float chamber;
  • spray.

Also in the carburetors of chainsaws there are fuel channels, a throttle (gas) adjustable damper, an air damper, filters and adjusting screws.

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Adjustment and device of the Carver chainsaw carburetor

The carburetor of the internal combustion engine of the Carver chainsaw is responsible for supplying a correctly metered fuel-air mixture. By increasing the mixture supply, when the throttle handle is pressed, the engine speed increases. Consistent idling is also dependent on proper carburetor operation. This is an important chainsaw system and you need to have an idea of ​​how it works, know the basics of diagnostics, and also be able to adjust and repair.

  • Carburetor device on chainsaw Carver
  • The main components of the Carver carburetor
  • The principle of operation of the Carver carburetor
  • What the three carburetor screws L, H, and T regulate.
  • When customization is required
  • How to set up a carburetor on a Carver chainsaw
  • Carver saw carburetor repair: possible malfunctions and their elimination

Carburetor device on chainsaw Carver

Most modern chainsaws (Carver are no exception) have either completely the same type of carburetors from the same manufacturer (for example, Walbro), or very similar in design. But even with differences in the appearance of the case, the principle of operation of all carburetors is absolutely the same.

But the carburettors on Carver saws differ from other chainsaws in the availability of adjustment. The adjusting screws on most other saw models are hidden under the body and often have unique shaped notches. Therefore, they can only be adjusted with special “branded” screwdrivers, which are sold in service centers. The Carver carburetor is adjusted with a regular flat screwdriver. There are three holes for adjusting screws in the case. Therefore, the carburetor on the Carver chainsaw can be adjusted without even removing the cover.

The principle of operation of the Carver carburetor

After starting the engine of the chainsaw, the air damper opens, through which the purified air enters the diffuser with a fine filter. Gasoline gets there through the calibrated holes in the jets. The amount of air-fuel mixture that enters the combustion chamber from the carburetor is regulated by the position of the throttle valve connected with the throttle handle.

The needle valve shuts off the flow of gasoline into the carburetor when it is filled. Gasoline passes through the filter before entering the nozzles, which reduces the risk of clogging the calibrated holes in them.

What the three carburetor screws L, H, and T regulate.

On older models of chainsaws, there are only two adjusting screws. One of them adjusts the idle speed by simply raising the throttle. When it twists, the passage under the flap increases, the supply of fuel to the combustion chamber increases, the engine increases revs. In essence, twisting “adds throttle” without pressing the throttle grip.

In modern Carver chainsaw carburetors, the idle adjustment screw T does not regulate the throttle position, but the amount of fuel flowing through the idle jet.

The screw L has a sharp needle-shaped tip inside and regulates the main flow of fuel through the calibrated orifice of the jet.

There are two such screws in modern models. One. L, regulates the main fuel flow at low and medium speeds (not to be confused with idle). The second. H, determines the fuel supply at maximum speed.

Poor adjustment of the H screw can lead to unpleasant consequences. For example, the internal combustion engine of the Carver chainsaw, designed for a maximum speed of 12 thousand rpm at full throttle, will develop up to 15 thousand rpm and fail. over, any adjustment only H leads to an imbalance in the fuel supply, and the engine can “sag” at certain speeds.

When customization is required

Modern “three-screw” carburetors of Carver chainsaws are practically not designed for manual adjustment at home. The screws are provided for factory setting, are securely fixed against rotation during vibration by tenacious springs and do not arbitrarily change their position.

But the screws on the carburetors of Carver chainsaws are available for adjustment through special holes without removing the casing, with a regular screwdriver. This suggests that such models structurally need to adjust the carburetor from time to time.

The reason for this, from a technical point of view, cannot be precisely named. Only versions are possible:

  • The carburetor of the Carver chainsaw is in an area of ​​increased vibration, because of this, the screws spontaneously unwind.
  • Coarse spring installed, which cannot fix the screw like on other models.
  • Periodic adjustment is required due to the technical features of the carburetor and the internal combustion engine of the Carver chainsaw as a whole.
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How to set up a carburetor on a Carver chainsaw

The idle speed adjustment with the T screw is always separate. If the engine of your Carver chainsaw stalls at idle speed, this may be due to:

  • poor performance of the spark plug;
  • loss of compression due to critical wear of the piston system;
  • poor fuel;
  • poor carburetor performance, not related to adjustment;
  • paraffin-clogged filters in the tank and carburetor.

For the same reasons, the engine of the Carver chainsaw can work poorly not only at idle, but in general it does not pull, does not develop speed, stalls when the throttle is pressed, etc. Therefore, you must first try to deal with these reasons. And last of all, if the problems are not solved, you can try to increase the idle speed by turning the screw T clockwise.

  • If the engine does not start at all at idle precisely because of a misalignment, the T screw is tightened 1/2 or 3/4 of a turn and the engine is started.
  • Then it is adjusted by ear with the engine running, observing all safety measures. (With a strong increase in speed, the chain of the chainsaw may begin to rotate, and this is dangerous).
  • If the chain is spinning at idle, the screw T is unscrewed back to a position in which the engine at idle works confidently and does not stall, and the chain does not spin.

Then they check the operation of the chainsaw engine in all modes. If it runs stably at idle, but stalls when the gas is pressed, it is a sure sign of a lack of fuel supply to the combustion chamber. With proper operation of all systems, clean filters and nozzle, the cause is most likely a violation of the adjustment of the screw L.

  • It is also better to adjust it on the running warm engine of the Carver chainsaw, screwing in 1/4 of a turn and trying to gas.
  • If the fuel supply is too abundant, the engine will run as idle with the full throttle. This means that the screw L is tightened too much and it is necessary to unscrew it back in steps of 1/4 turn, trying to give gas.

If, after adjusting screw L, the Carver engine does not deliver the power required for operation, you can carefully try to increase the maximum speed by adjusting screw H.

It is also adjusted with the engine running, but with the full throttle position. Extremely carefully, 1/5, 1/6 of a turn, the screw is screwed in and listened to the engine operation.

An increase in the speed ceiling can slightly extend the life of an old chainsaw with a worn piston. Weak compression is compensated by a higher mixture flow at maximum speed.

In new chainsaws, you should not experiment with such an adjustment.

Professional adjustment of the screw H is carried out using a tachometer to determine the speed ceiling and an oscilloscope to control the frequency of flashes on the candle. Compression is checked beforehand.

After adjusting the screw H, there may be a change in operation in other modes. Therefore, it will be necessary to test the operation in all modes and, if necessary, again slightly adjust the adjustment with the screws L and T.

Many people recommend adjusting the screws by tightening them all the way and then unscrewing them 1.45 or 1.5 turns.

It is not always worth doing this for the following reasons:

  • With a strong twist, the sharp end of the screw can destroy the loose powder bronze jet on cheap chainsaws, and this is a breakdown.
  • 1.45-1.5 turns from “to the end” may not correspond to the old position of the screws, at which the chainsaw still worked to the last, and the real factory settings.

Therefore, it is necessary to regulate on the basis of the “as it was” position by no more than 1/4 of a turn at a time. It is important to remember how much and in which direction the position of the screw was changed.

If you still need to turn the screw “to the end”, count the number of revolutions from the “as it was” position, this will make it possible to return the settings to the previous position. It is necessary to tighten “to the end” without effort.

The general principles of self-tuning the carburetor of a chainsaw are presented in the following

Do-it-yourself chainsaw carburetor adjustment

Chainsaw carburetor adjustment ensures efficient operation of the tool at full power while saving fuel. Adjustments must be made with a clean fuel and air filter. For a larger number of carburetors, the adjustment is carried out with three screws: for maximum and minimum revolutions and idle speed adjustment.

The H and L screws adjust the ratio of the mixture of gasoline and air, which is determined by opening the throttle valve of the carburetor. When the screws are unscrewed, the mixture is enriched, and the revolutions fall accordingly, when the screws are tightened, the mixture becomes leaner. the revolutions grow.

The designation H refers to the maximum speed screw that controls the main jet, L. to the minimum speed screw that controls the idle jet. The S screw is used to fine-tune the idle speed. Sometimes, to simplify tuning, the number of available carburetor adjusting screws is reduced.

Chainsaw carburetor tuning is divided into two stages. basic (factory settings), carried out with the engine off. and the final, produced on a running warm engine. The exact value of the angles of rotation should be taken from the operating instructions for the particular chainsaw. Failure to follow the manufacturer’s instructions may result in engine damage.

Basic carburetor adjustment.

The adjusting screws for maximum H and minimum L turns are slowly turned clockwise until they stop, then turned back 2 turns, other settings are also possible

Checking and adjusting idle speed.

We find the highest idle speed, for this we slowly turn the screw L in different directions. After finding the position of the highest engine speed, turn the screw L 1/4 turn counterclockwise. If the chain rotates at idle speed, screw T or (S) should be turned clockwise until it stops.

Checking and adjusting the maximum speed.

The maximum number of revolutions is changed by screw H. When screwing it in (clockwise rotation), the revolutions increase when it is turned out. decrease. Chainsaw engines have the highest rotation speed of 11500 rpm. up to 15,000 rpm. A higher speed does not provide ignition, moreover, it becomes dangerous for the engine. The rpm limit can be determined from the ignition interruptions. If they come, turn the screw H slightly counterclockwise.

When the throttle trigger is smoothly pressed, the engine should confidently and quickly gain speed from idle to maximum (from 2800 rev. To 11500-15000 rev. Depending on the unit). If revolutions are gained slowly, with a lag, screw L must be slowly unscrewed counterclockwise, but no more than 1/8 of a turn.

After adjusting the acceleration and maximum speed, the saw should be checked again at idle speed. the engine must run steadily and the chain must not move. Chainsaw tuning should be repeated if this condition is not met but with the exception of the basic adjustment step.

Adjusting the carburetor trimmer

lawn mowers have long been included in our lives as a very useful tool and a great alternative to the usual scythe. lawn mower and lawn mower are the same tool. And trimmers are gasoline, and there are electric. In this case, we will focus on gasoline. This unit is quite simple to operate, but it has its own characteristics. lawn mowers are equipped with an internal combustion engine. The carburetor for lawn mowers is a very important part of the tool. The main task of the carburetor is to ensure the flow of air-enriched fuel into the engine cylinder. The most important thing here is to maintain the balance of fuel and air. The article will tell you about the signs indicating the need for adjustment, how to adjust the carbrator on the trimmer.

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It is allowed to adjust the trimmer carburetor yourself, having previously studied the unit design. As a rule, a detailed description of the constituent assemblies of the tool is in the instruction manual. An experienced craftsman is able to even determine by ear that there are shortcomings in the work of lawn mowers. The sound of the motor, when properly tuned, should be perfectly smooth. If you can clearly hear screeching sounds, then the mixture is oversaturated.

Cases indicating the need for adjustment:

  • If a fuel mixture of a different composition is used;
  • With a long break in operation (the lawn mower lay idle for a long time, and even before the new season after winter);
  • After completion of the equipment break-in process (usually after using 4-5 liters of fuel)
  • When weather conditions change (this item is relevant for);
  • Poor engine starting
  • If fuel consumption has increased sharply;
  • An increase in the amount of exhaust gases;
  • Slow set of revolutions by the engine;
  • If the fuel mixture does not flow.

Idle speed adjustment

Following the adjustment of the fuel supply, we take up the idle speed adjustment. To do this, the corresponding screw must be adjusted so that the engine runs slightly accelerated at low revs. But it is necessary to monitor the immobility of the reel with fishing line and knives. Before starting their movement, there should be a few turns in stock. The movement of the spool and knives can subsequently lead to rapid wear of the clutch. Noticing that the engine does not start well, you need to increase the number of idle rpm. As the revs increase, the fuel mixture is saturated with air, which leads to a loss of power.

The main signs of correct idling:

  • Stock of turns for the trimmer head;
  • Uninterrupted operation of the engine even when changing position (sharp rise or fall of the knife);
  • Quiet operation of the engine on a cold run;
  • Absence of increased rpm of a hot engine.

Fuel supply adjustment

Adjustment at maximum speed

Further, to fully tune the carburetor, the lawn mowers need to adjust the maximum rpm. It will not be superfluous to look into the instruction manual of the tool and see the maximum value of the revolutions. Most accurately, this number will help determine the tachometer. If such a device is not at hand, we tune it by ear. Having barely determined by ear the maximum value of the rpm, we begin the adjustment. The screw for limiting the maximum speed will help in this matter. Check the operation of the engine at maximum speed. If it is necessary to reduce the speed, it is necessary to loosen the fixing nut and unscrew the screw. If the revolutions are too high, then you will need to screw in the screw. These steps must be done in order to protect the engine from overheating. It is necessary to turn the screw until a clear smooth engine operation is established.

After the work done, if everything is done correctly, the stable operation of the tool is ensured.

This will be understood by the following signs:

  • The cutting element will stop rotating when idling;
  • Fuel consumption will decrease.

Carburetor setting lawn mowers with three adjusting screws

Place the mower on a flat, stable surface before starting work. Turn the chain in the opposite direction. Lawn mowers are available with two and three adjusting screws. The two screws are most often equipped with tools made in China. Consider adjusting the carburetor of a lawn mower with three screws.

Carburetor setting lawn mowers with three adjusting screws

The air filter must be rinsed before proceeding with the carburetor adjustment of the lawn mower. Cleaning is carried out with water with the addition of detergent or soap, and, if necessary, a new one is installed. Often, blockages are to blame for poor carburetor performance. As a preventive measure, it is recommended to clean the filter after every 10 hours of tool operation. Do not forget to check the condition of the candle, if there is carbon deposits, you need to clean it. Candles are consumables and have their own resource. To ensure good engine performance, lawn mowers need to be replaced periodically. Next, we evaluate how well the carburetor is attached to the cylinder-piston group. After finishing the preparatory manipulations, you need to start the engine. Let the engine run for 5-10 minutes. Then you need to identify how many adjusting screws on your instrument.

The petrol trimmer has the following adjusting screws:

  • Idling adjustment screw;
  • Fuel mixture adjustment screw
  • Maximum speed limiting screw.

Carburetor setting lawn mowers with two adjusting screws

Adjusting the carburetor for two-screw lawn mowers is much easier than described in the first option. However, it is worth noting that this setting is less accurate. Before starting the setup, you must memorize the factory parameters of the lawn mowers. After a while, the engine starts and runs for several hours. Although on some instruments, 10-15 minutes of work is enough to set the necessary parameters.

Carburetor setting lawn mowers with two adjusting screws

First you need to start the engine at low speed. If, during operation, the chain moves along the bus, then this is not the norm. You need to adjust the screw so that the chain stops moving.

Next, you need to go to medium speed. After which the engine can smoke. The adjusting screw will also help eliminate this nuisance. By tightening it harder, the fuel mixture, which is less enriched, will begin to flow into the engine. After that, the smoke will disappear. But the turnover will increase. Adjustment must be made until smooth, precise operation without jerking is achieved.

After all the necessary settings have been made, it is necessary to let the trimmer work in real conditions for more than one hour. After a while, it would be good to check if all the components are working correctly. If deviations are found, they need to be eliminated.

An indicator that the adjustment has been completed successfully will be residual combustion of fuel and a slightly brownish color of the plug. The color of the carbonized candle is darker.

Adjusting the carburetor for lawn mowers is a very important preventive measure that must be carried out every time such a need arises. As described above, such a need may arise quite often. By the way, screws that have loosened from vibration can also serve as a reason for tuning. In order for the tool to serve for a long time, you must always follow the instruction manual for the lawn mowers, use the correct fuel mixture.