Why and how to adjust the carburetor chainsaw

operating a combustion engine that has a combustion engine running a combustion engine

is running on a charger that has an internal combustion engine. Adjusting the carburetor chainsaws needed to prepare the mixture in the required proportions. From the work of the carburetor depends on whether the engine will work with the stated power or stall.

The principle of operation of the carburetor

Regardless of the manufacturer's company, the principle and order of operation of the carburetor of internal combustion engines is the same. For mixing air and fuel, the carburetor is a device that includes:

• air tube with a constriction;
• fuel supply system;
• regulating air damper.

Air under atmospheric pressure, passing an air cleaner, is supplied to the restriction zone, where its flow is regulated by a flat valve that covers the cross section. After narrowing in the pipe there is a discharge. As a result, the vacuum sucks the fuel from the fuel supply tube, the output of which is regulated by a fuel needle connected to the float chamber by a jet. The device of the carburetor chainsaw in principle does not differ from other mixers of fuel internal combustion engines.

The principle of mixing is to regulate the air damper, the level of the float, depending on the degree of vacuum. Open air - more fuel flows, the engine increases speed. The correct ratio of the combustible mixture depends on the fine adjustment of the carburetor chainsaw. If there is a lot of air in the fuel, the power drops, the mixture is called depleted. With a lack of air there is a large fuel consumption, incomplete combustion, carbon deposits on the cylinder and the exhaust of unburned fuel. This says that the mixture is supersaturated.

Chainsaw Ural according to the instructions requires running in with the use of enriched fuel mixture. Therefore, the carburetor from the factory comes with a setting for the period of running. When switching to the operating mode, the node is re-configured.

Signs of good performance of the carburetor chainsaw:

• engine runs smoothly, reminiscent of the four-stroke sound;
• quick turnaround;
• idle circuit does not scroll.

When setting the carburetor

is required A new chainsaw is adjusted to the recommended mixture. It will only require precise fine-tuning with the help of three screws; you do not need to disassemble the carburetor. The purpose of the adjusting screws:

• "L" regulates the flow of fuel at low revs;
• "H" is needed to regulate the maximum fuel supply;
• "T" idle speed regulator.

Since the carburetor adjustment of the saw occurs by ear when the engine is running, it is necessary to observe safety measures. The saw must be positioned steadily with cutters pointing in a safe direction.

Before starting the manipulations, it is necessary to mark the initial position of the screws with a paint or felt-tip pen. The exact setting values ​​of the carburetor chainsaw for each model are in the instruction manual.

However, it is often necessary to tune the carburetor after eliminating the tool malfunction. The reasons may be:

• protective cap violation and unbalance of screws;
• engine piston wear, requiring a different composition of the mixture to work;
• unsatisfactory performance of the carburetor.

How to adjust the carburetor on the chainsaw specific model? Perform successive operations, guided by the instructions. Here is the algorithm, the general sequence of actions.

There are two stages of configuration:

• basic, with the engine off;
• thin - on a warm engine, at idle.

Basic setting is carried out only for fuel supply screws at low and high revs. Smoothly slowly, you should completely shut off the flaps until it stops. Also smoothly turn counterclockwise both screws 1.5 turns. After that, start the engine and warm it up for 10 minutes.

How to set up a carburetor on a chainsaw when the engine is on:

• adjust the idle stroke with the “T” screw, turning counterclockwise until the engine is stable at idle;
• check the speed of rotation, with a slow unwinding, turn the screw L by 1/8 of a turn additionally;
• set the highest rotational speed on the tachometer with screw H;
• test the carburetor idling finally.

How to find a malfunction carburetor

However, the adjustment may be preceded by the repair of the carburetor itself, when it can not perform its function of the fuel mixer.

If fuel for some reason does not enter the engine, you need to check the status of the fuel delivery unit. Often the cause is the supply of poor-quality gasoline, as a result of clogged fuel passages.

If the mixture of fuel has stood for a long time, the additives have collapsed, the mixture can clog the sills, the grid. In this case, a long flush is required, which is done with solvents in a service workshop.

Self-Troubleshooting

If you carry out the repair of the malfunction with your own hands, you need to free up space and expand small parts. Need a tool:

• brush;
• cross-head screwdriver;
• socket wrench or M6 head;
• pure gasoline.

The main thing is to properly release the unit from the installation site, cleaning it from the outside of dirt. The air intake is removed, opening access to the carburetor and suction draft. Remove the accelerator lever by lowering the carburetor flap. To release a detail, having removed the suction lever, having lifted on itself a wire together with the lever, having hooked on the left.

Wash the vacated carburetor in gasoline, purge it with air, clean the grille, making the injection with a fine needle.

Assembling the knot in reverse order, you should make sure that the spring under the needle lever is put in place. If you forget it, the fuel is not cut off, the candle is damp and does not give a spark.

It happens that the gas key slightly klinit on the saw Calm. In this case, it is necessary to clear the throttle from plaque. After cleaning it is necessary to protect the valve with tinning.

After collecting the carburetor, setting it in place, adjust it as described above.

Video instruction on carburetor adjustment chainsaws