STIHL 180 fails to rev

Table of Contents

No cutting off the chain saw

A chainsaw is a worthy substitute for hand saws and axes. Now this tool is available in almost every household. it is indispensable for the arrangement of the garden plot, construction and repair work. Heavy use and improper maintenance can lead to premature failure of the equipment. But the owner of the chainsaw does not necessarily need to go straight to the shop. many of the defects that can happen to her during use, it is completely realistic to remove without the help of others.

The chainsaw design and general fault classification

The main condition for successful repair is accurate diagnostics. So to find why the chainsaw is out of order and, more importantly, how to make it work again, we first need to know the peculiarities of its construction.

Бензопила STIHL MS 180. слетает тяга управления ДЗ

It should be noted, it is not particularly difficult, as it includes:

  • engine (two-stroke gasoline);
  • multifunctional part (saw bar and chain);
  • Systems that ensure the joint operation of these 2 nodes (ignition, filtration, lubrication, etc.д.), in other words of the tool in general.

In order to simplify the diagnosis of faults it is customary to distinguish them into two main categories:

often malfunctions occur in the motor systems, but other parts of the tool due to intensive use or improper care can at any time fail. How to find exactly where the breakdown occurred? The usual logic will help us in this.

If the problem is in the engine, it will:

  • Does not start;
  • stall;
  • unstable operation;
  • overheating;
  • smoke;
  • develop insufficient power.

As for all the other faults, they usually show up when the engine is running normally.

Starting the engine: check the plugs

If the chainsaw does not start, the first thing to do is to check the presence of fuel consistency in the tank. By the way, it needs to be prepared in the proportions, designated by the manufacturer of the engine, otherwise the tool simply will not start.

After making sure that the fuel mixture is correct and available, you should check the ignition system. STIHL 250. My STIHL STIHL 180 chain saw won’t run at idle speed. STIHL chain saw works fine at low RPM and stops when you press the gas. To do this, you need to look at the spark plug.

Its condition can tell you a lot:

indicates that the fuel mixture does not enter the carburetor, which means that the problem is not in the ignition;

is the result of an excessive fuel mixture, which lies either in a violation of the method of starting the engine or in a wrong adjustment of the carburetor;

it is a signal of bad oil in the engine lubrication system, incorrect carburetor settings or incorrectly prepared fuel consistency.

If the spark plug is splattered with fuel, after removing it, it should be thoroughly wiped. The fuel system should also be cleaned. to do this, it is shut off and then the starter is cranked. A soot-covered spark plug should be cleaned gently with an awl and an emery.

When checking the plugs should pay attention to the distance between the electrodes (the usual gap is 0.5-0.65 mm), also the state of the gasket and the presence of spark. A frayed or worn gasket will have to be replaced, and the spark can be checked by putting on the ignition cable, connecting the cylinder and spark plug nut and starting the starter.

If the discharge does not occur, the spark plug must be changed. If there is soot on the spark plug, it indicates that the Husqvarna 137 chainsaw is running on low-quality fuel. In this case, if the spark and the latest spark plug does not arise, it means a problem with the connection with the high-voltage wire or in it itself.

Repair of chainsaws with their own hands: the fuel supply system

If the fuel mixture is not flowing into the cylinder, but the spark plug is working fine, it could mean that:

To clean this assembly, remove the fuel hose and check the jet. If it is weak, the filter should be taken out through the filler hole in the fuel tank and cleaned or replaced if completely worn out.

The chainsaw works at high revolutions

I get high rpm or stalls, but it turns out.

Chainsaw is running at high rpm

The gasket is broken and squeezed out Free advice is better by Skype ork.Call either tel. 380979677418 than.

As a preventive measure, it is recommended that you replace the fuel filter at least once every 3 months.

This is nothing but a hole in the fuel cap, which is cleaned with an awl.

There may be several reasons for this:

  • the air filter is clogged (in this case it should be taken off, washed with water, dried and put back);
  • the carburetor options are knocked down (it means this node should be re-adjusted);
  • the integrity of the carburetor membrane is broken (must be replaced);
  • carburetor ducts are clogged (you need to disassemble and clean all parts and assemblies).

Troubleshooting muffler problems

If at low revolutions the chainsaw motor works normally, but at high revolutions it starts to glitch and smoke, the muffler may be hiding in the muffler.

To check the quality of its work should be performed:

  • disassembly (with unavoidable closure of the outlet);
  • disassembly (if the muffler is disassembled);
  • removing carbon deposits with a special detergent or using a dry method;
  • drying out (with hair dryer);
  • Reassembly and installation.

Dry-cleaning without respiratory protection is not recommended. in this video you will learn about a chain saw that doesn’t operate at a low rpm and fires up only when the choke is turned on.and how to eliminate. Carcinogens in the soot will be released into the atmosphere in the form of dust, inhaling which is very hazardous to your health.

To prevent the muffler from clogging during use, it is essential to keep a close eye on the fuel consistency and quality of its components.

Piston Cylinder Group (BCG) Repair

If the chainsaw engine does not start or cannot develop normal power, it is entirely possible that there is not enough pressure in the cylinder of the engine to burn the fuel consistency. This could be caused by parts of the cylinder or piston assembly such as the piston, rings, bearings etc. being worn out. To assess the condition of the unit, you should conduct a visual inspection, removing the muffler before.

For a more complete diagnosis, a compressometer is placed in the spark plug hole of a two-stroke chainsaw motor. Use it to check the compression in the engine. By the results of the check you can judge about the condition of the cylinder head, but clear facts can be obtained only by complete disassembly.

If there are chips or scratches on the piston, of course, that it must be replaced. The same applies to deformed or broken piston rings. for normal engine operation, they must be one hundred percent serviceable and clean from sludge.

Checking the carburetor and signs of need for adjustment

Correctly working carburetor guarantees the highest efficiency of the chainsaw, in other words, can be a full-power development at a more economical flow of fuel consistency. How, if at low revolutions the chainsaw motor runs and chain repair of the chainsaw. This unit is usually adjusted at the factory, but its design anticipates the possibility of option already in use.

The fact that such adjustment will have to be performed by the chainsaw owner is evidenced by:

  • Strong vibrations or damage of the protective cap.
  • Wear of the gas cylinder gear.
  • Clogged carburetor.
  • The engine cannot be started or stops on start-up.
  • Increase in fuel consumption and emissions with a simultaneous drop in engine output.
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Adjustment of the chainsaw carburetor is performed in serious accordance with the manufacturer’s annotation with the help of 3 special screws, which are responsible for the highest (“M”) and lowest (“L”) speeds and idling of the motor (“T”) Engine operates normally at idle speed, (not at high rpm, the chain on the. To exclude unnecessary intervention of an inexperienced user in the carburetor, some manufacturers install only one idle speed screw.

Calibration algorithm and safety precautions for carburetor troubleshooting

Adjustment of the carburetor is made in two steps:

For the basic adjustment you have to tighten the screws H and L up to the stop and unscrew them back 1.5 turns. The saw starts up perfectly, rpm is OK, rpm is good when you accelerate. The final calibration asks to warm up the engine for 5-10 minutes at a low rpm.

The final calibration is done by unscrewing the idle speed screw until the engine revolutions are low (the engine should be stable and the chain should not move). If the engine stops when idling, the screw must be turned back, and in this case, if the saw chain is still in motion, you should continue to turn counterclockwise.

The calibration is verified by a test:

  • Acceleration (with a gentle pressure on the gas pedal the engine should quickly gain speed to the highest rate).
  • The greatest number of revolutions (in the presence of interruptions in the ignition of the screw H should be slightly weakened).
  • Idling (the chain must not move and the engine must rev up very quickly).

If your chainsaw is not familiar with the carburetor and does not have the right tools to calibrate it, call a professional. The carburetor. a very complicated unit, so any wrong action can lead to irreversible consequences, for example, complete failure of the engine.

Other chain saw malfunctions

If diagnostics has shown that everything is all right with the engine and its systems, then the cause of malfunction should be found in other nodes of the chainsaw. common are commands such as:

  • Failure of the starter;
  • Improper functioning of the lubrication system;
  • The chain brake does not work properly;
  • wear and tear of the saw chain, etc.д.

If the cause of failure of the tool is not visible to the naked eye, as in the case of the engine, you need to perform a painstaking diagnosis of defects and remove them in accordance with the manufacturer’s advice and safety regulations.

The most common cause of this common failure is a misaligned choke. It is necessary for the intake of air, which is required for the carburetor to enrich the fuel mixture with air. To adjust the choke, you need to adjust the operation of the carburetor. In doing so, pay special attention to the operation of the power unit at idle speed. To check engine operation in idle mode, you can pay attention to the state of the circuit immediately after starting the engine. If it spins, you will need to adjust the power unit.

Another reason for this common problem is air intake. If there is an air leak in one of the chainsaw’s mechanisms, the mixture will automatically be depleted, which will cause the chainsaw’s motor to spontaneously rev up. In this case, the operator will need to carefully check the entire fuel system, including the carburetor, pipes, working chambers node.

In some cases the chainsaw does not cut off because the throttle cable is jammed. Check the fuel capacity in the fuel tank and add more fuel if you feel like it. The problem can be solved by disassembling the throttle grip and inspecting the entire throttle mechanism. A jammed cable might need to be adjusted or completely replaced.

The tool stalls immediately after starting

It is very likely that this is due to a shortage of gasoline. Check the volume of fuel in the tank and if you have a desire, add fuel. Follow the advice in the booklet, especially the characteristics of the petrol and not the oil. In our country these details are often ignored and you fill up your chain saw with whatever you have, and this causes faster wear and tear on the motor and leads to malfunctions.

It is also possible that it shuts down because the spark plug and the ignition lead are loose. This and for you is caused by mechanical displacement by another formation of carbon deposits. It is recommended from time to time to replace the spark plug with the newest one, if the old one did not show any troubles during the operation.

The chainsaw can work normally in a straight, horizontal position, but, frustrating as it may sound, it stops when you tilt it sideways. You, this is also due to lack of fuel: the fuel tube rises when tilted, when there is actually no fuel, then like oil rises above the level of fuel.

The chainsaw stops when idling

It is recommended to our customer to check the muffler, because its dirtiness can cause a deterioration of the exhaust system, and therefore the engine does not stop.

If cleaning the muffler did not help remove the problem, and your saw’s carburetor engine, you have the option of trying to tune it. On most models of engines there are adjusting bolts of coarse not clear option (H not L respectively). Increasing the engine rpm by applying them is to remove the problem. Keep in mind that the adjustment of the carburetor. it is quite a narrow process, requiring the introduction of tachometer.

The engine can’t take the strain

If the chainsaw stops exactly in the middle of a particularly thick log, the malfunction for you is caused by problems in the fuel supply system, otherwise speaking uncomfortable with the air filter. The engine simply does not get enough combustible consistency in the workplace with a strong load, does not stop.

The usual solutions to these problems. substitution of fuel in strict accordance with the advice in the annotation (we have already said about this) and cleaning (substitution) of the air filter.

The chainsaw stalls at higher rpm

Similar causes are similar to the ones that preceded it: either a problem with the fuel system or with the air filter. Try to disconnect the fuel hose from the carburetor. if the gasoline flows badly (but you know for sure that the fuel in the tank is), then the cause is in the gasoline filter. You can, at the same time, check the fuel pump. the fuel should not penetrate it. When this happens, it is purposeful to change the pump.

STIHL chain saw stalls at high RPM

Chainsaw stalls at idle speed: this is probably the problem faced by owners of the tool. The STIHL chainsaw is by design quite light. However, there are cases when it breaks down. The main problem in troubleshooting is determining the correct cause of the malfunction. After determining the cause, fixing the defect is usually quite easy.

Probable causes of failure

All chainsaws are powered by a single-cylinder combustion engine. Malfunctions are characteristic of this type of device, such as a violation of intra-cylinder compression, changes in the fuel mixture ratio, improper ignition operation, poor-quality fuel and lubricants. The main problems in the operation of the power unit are the following:

  • Engine runs steadily at minimum rpm, but stalls when rpm is increased;
  • Starts normally but idles erratically, quickly throttles;
  • Will not start.

Electronic chain saw ignition diagram.

There are a variety of possible causes for the malfunction during idling. They can be divided into several positions:

STIHL STIHL 180 chain saw starts and stops Cause.

  • The capacity of the filters (gasoline and air) is reduced;
  • The ignition system does not work properly:
  • Spontaneously changed the settings of the carburetor;
  • Faulty elements of the gasoline line;
  • Clogged exhaust ducts, muffler;
  • Defects of the piston, cylinder, valves.

Repair should begin with an external inspection and check the presence of fuel in the tank.

Check and Repair Filters

The engine may malfunction or shut down if there is not enough fuel or air. The causes are clogged air or fuel filter. To check the fuel filter, take off the fuel hose from the carburetor nozzle and direct it into some container. Then press several times to pump the fuel. If fuel is pumping normally, in well-defined doses, without dirt, then the fuel filter is fine. If the fuel flows weakly or doesn’t pump at all. you should replace the filter or if possible clean it.

READ What kind of chain oil do you need for your chainsaw?

Sawdust clogging in fuel filter is one of the reasons of chain saw breakage.

The unit should be removed from the fuel tank (first drain off all fuel). In most models the fuel filter can be pulled out with a wire hook through the throat. If the filter is collapsible and can be cleaned you need to disassemble and rinse it according to the manufacturer’s recommendations. Otherwise replace with a new filter.

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STIHL STIHL 180 chain saw cuts out at idle speed.

Similar problems can occur if the air filter is clogged with dust, sawdust, dirt. Insufficient air flow makes the fuel mix richer and makes combustion more difficult.

Remove the filter for inspection. Always take precautions when working so that dust does not enter the carburetor. Unit should be cleaned and washed in lukewarm water and detergent. After drying if possible blow it off with compressed air at low pressure and put it back. If the chain saw lets it fire normally, you have found the cause. If not, keep looking.

If you use the machine regularly, we recommend changing the fuel and air filter every 3 months.


STIHL MS 180 repair / carburetor disassembly and assembly / cuts out at idle speed

STIHL MS 1800 chain saw. The right way to solve the problem if the chainsaw stalls and the saw.

Checking the spark plug and ignition system

The manufacturer recommends that the spark plug be changed annually, regardless of how often you use the tool. It is only natural to expect the following to happen if you don’t follow this advice: Your STIHL chain saw breaks down at idle for a few minutes idle

Typical ignition system defects are as follows:

STIHL STIHL 180 chain saw stops at idle.

  • The spark plug was soaked with fuel at the start. Take it out of its socket, dry it and if possible blow it out with compressed air. Drain any fuel residue from the cylinder through the adjustment hole, blow out with compressed air. Then install the spark plug, connect the high-voltage line, start the engine.
  • No spark on the spark plug electrodes. You must disconnect the high-voltage wire and check the spark on it. If the spark is normal, check the connection and eliminate the defects found. Lack of spark on the ignition lead is a sign of a faulty ignition assembly. This unit cannot be repaired, it must be replaced by a new one.
  • The gap between the electrodes of the plug is broken. This parameter for different types of devices can be in the range from 0.2 to 0.5 mm. Check and correct with a special dipstick or caliper. Refer to the instruction manual of the tool for the required value.
  • The appearance of the spark plug can indicate the direction to look. If the spark plug is dry after several attempts to start the engine, it means that there is no petrol in the cylinder. The fuel system and carburetor should be checked.
  • Black soot or carbon deposits on the electrodes indicate improper carburetor adjustment or clogged air filter. Poor-quality fuel with large amounts of oil may be being used. The electrodes are evenly gray with brown deposits on the insulators when the ignition system is normal.

READ What Oil to Add to Gasoline for a Chainsaw

STIHL chain saw stalls at idle speed.

If checking the ignition system, fuel filters, muffler did not give tangible results, the tool still does not want to work properly at minimum RPM, you need to check the carburetor.

There are three screws on the chain saw for adjusting the settings, one for the minimum RPM, one for the maximum RPM and one for the idle speed.

On many models, manufacturers install only the idle speed adjustment screw to avoid incompetent attempts to adjust the unit. In all variants of the device the adjustment should be carried out exactly according to the recommendations of the producers.

If the adjustment of the device did not restore the normal operation of the tool, you need to carry out a complete disassembly of the device with inspection. It should be understood that the carburetor. quite a complex device, in the absence of experience, it is advisable to consult specialists.

When disassembling it is important to carefully inspect and wash all nozzles, air and fuel passages, and the filter screen. Damaged elements should be replaced with new ones. Clean the nozzles with a soft wire of appropriate diameter.

It is desirable to perform the work in the proper conditions. The carburetor has many small parts, and failure of any of them will make the unit inoperable.

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Muffler Inspection and Repair

Clogged mufflers should be left to soak in warm water with detergent and then carefully wipe and dry.

Бензопила Stihl ms 180 доработка воздушного фильтра

Muffler failure leads to loss of power of the tool during work and idle stops. Despite the apparent simplicity of this part, it’s also important to keep an eye on it. It is quite common for the muffler to become clogged. Wood dust, sawdust, resin particles, and other contaminants can get on the wire mesh when you’re working. High temperatures can cause buildup and adherence, and exhaust fumes can also form deposits on the surfaces of the spark arrestor and other parts. If the oil level in the brake pedal is too low, do not touch the accelerator pedal until you hear a steady stream of oil. The engine is, figuratively speaking, suffocating.

Repair of this unit is not complicated, quite on the power of many tool owners. The device should be removed from the engine, the holes should be closed with a rag or other material. If the formed layer is too hard, all parts may be left to soak in warm water with detergent. After the deposits have softened, wash with a cloth or soft brush and dry thoroughly. Inaccessible places can be blown with compressed air or dried with a hair dryer. The use of mechanical means of removal is undesirable.

For the normal functioning of the muffler during a long period of operation you should use the lubricants recommended by the manufacturer, watching their expiration date. The mixture should be prepared just before the work and spent in full.


Chainsaws, like most tools, need service and care on time.

Why does the chain saw quit while heating up?

It is not uncommon for a chainsaw to start when cold, but shut down when warmed up. It might be caused by the following things:

  • The carburetor is not properly adjusted. You can identify this problem by the way the device is started in the cold. If it is made without closing the air damper, and the engine starts without a preliminary flash, it means that after heating the engine fuel floods the spark plug. The solution to this problem is to adjust the carburetor. on carburetor adjustment
  • Faulty coil (ignition module). You can check for this problem by successive checks of the spark, first on a cold engine, then on a hot one. If there is no spark on a hot engine, the ignition coil must be replaced.
  • Spark plug failure. In this situation, as with ignition module failure, the spark disappears when the motor heats up. Replace the spark plug with a new one and if that does not solve the problem, check the ignition module and the distance between the spark plug and flywheel.

STIHL chain saw does not rev

2) Chainsaw malfunction: The chainsaw won’t pull. Cause: Plugged carburetor. How to repair your STIHL chain saw: Disassembling and cleaning the carburetor. Pay extra attention when cleaning the carburetor to clean the additional filter (mesh in the carburetor chainsaw). remove the largest cover on the carburetor, remove the membrane under it and clean dirt from the mesh in the recess (carefully to support this mesh). On your own. clean with a narrow copper wire, wash and blow the channels in your chainsaw’s carburetor.

3) STIHL 180 chain saw malfunctions: The saw’s idle speed has increased (no idle speed adjustment is effective or even measured).

STIHL 180 chain saw doesn’t pick up speed and stops.

Бензопила “Штиль МС-180” (Stihl МS.180). Каков её предел?

Cause: Air intake at the crankshaft oil seal or wherever you like. Fixing chainsaw malfunction: Replace crankshaft oil seals and check other possible leaks.

4) Chainsaw malfunction: After opening carburetor, chainsaw has some difficulty starting, muffler gives off white smoke. Cause: Disassembled the carburetor lost the spring under the needle lever, as a result, the needle does not lock the fuel supply and the spark plug pours gasoline. 5. Chainsaw Failure Remedy: Locate and replace needle-lever spring in chainsaw carburetor.

5) Chainsaw malfunction: Chainsaw won’t start, doesn’t run properly. Cause: Spark plug is flooded with gasoline because of a stuck needle in the carburetor or the rocker arm is raised high. Do-it-yourself chainsaw repair: Flush and purge carburetor, set rocker arm correctly.

STIHL 180. The classic. Not enough rpm

The STIHL MS 180 chain saw has a few quirks that make owners nervous and spend a lot of money.

Troubleshooting STIHL 180 chain saw

It’s either air intake or a leak in the carburetor.

The STIHL MS 180 chain saw can be repaired by disassembling, flushing and blowing out the carburetor, changing the fuel filter in the tank and checking the fuel hoses for cracks (air might be sucked in). There’s only one carburetor adjustment screw. idle speed (you can turn it and get the chain saw going again). Connection between carburetor and cylinder, in the sense of air suction, is reliable. there is a plastic ring (no gaskets required).

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STIHL 250 chain saw malfunction (chain saw carburetor malfunction):

Immediately after starting the chainsaw works at high rpm, and if you press the gas, then instead of starting to accelerate, it crushes, and even throttles. Or it starts badly, does not pick up revolutions and shuts down (this malfunction also applies to other expensive chainsaws with a gas pedal pump in the carburetor).

Cause of malfunction: The rubber sleeve on the carburettor booster pump (fuel booster) piston is worn. It leads to the air suction by the booster pump and the master jets feed the depleted fuel/air mixture into the nozzle (there is not enough gasoline in the mixture) and the chain saw works at high rpm at first, and then crushes and shuts down. It happens after 2-3 years of operation and usually in the hot summer months.

Troubleshooting chainsaw carburetor

Remove carburetor from chainsaw. Remove the gasoline pump cover with the diaphragm by removing one screw in the center of the cover. Next, turn the carburetor towards yourself with the throttle, on the side where there are two holes, in one you can see a pin, here under it is the booster pump. Remove the circlip from outside the pin and disconnect the air damper spring. Unscrew the screw in the center of the throttle, remember how the throttle is facing (to put it in the same way later) and remove the throttle. Use your finger to put a pin in the hole (the gas pedal is spring loaded and if you remove the throttle body and leave the hole open, the gas pedal will pop out) and then rotate the throttle body and remove it. Dismantle catalyst (piston and spring) and remove it from the hole. There is a rubber cuff (ring) on the piston, its wear is the reason of chain saw malfunction. It is necessary to replace the piston with a rubber cuff and spring (they are sold as a repair kit). Or you can take out the worn piston and spring, and plug the hole by pushing in a rubber plug (the chainsaw will be without an acceleration pump, t.е. will not accelerate in 3 seconds., but in 4 seconds., but will work well because there will be no air suction from the carburetor).

STIHL 180 doesn’t pick up RPM and shuts down.

Reassembly after troubleshooting chainsaw (after troubleshooting chainsaw carburetor) is done in reverse order of disassembly. When assembling the throttle, before tightening the screw, the throttle itself must be properly aligned so that it does not jam, and the threads of the screw securing the throttle to the axle should be degreased and smeared with a special thread sealant (available in small tubes, red, liquid) or flatten with pliers, because if this bolt twisted during operation, he went straight into the cylinder) and repair or replacement piston can not avoid). Here we look at troubleshooting this chainsaw malfunction.

Saws crooked

Let’s look at the reasons why a chainsaw cuts crooked. It shows up during sawing under load, when the bar moves to the side little by little. It is especially noticeable when sawing a wide trunk by double-cutting, first from the top, then from the bottom. The result in the output is an uneven cut surface which in some cases is unacceptable. Example. cutting mitre cuts.

  • Unevenly sharpened saw teeth. This is the most common reason for an askew sawing machine. The teeth should be ground to the same distance to avoid problems when sawing. The optimal solution is to buy a sharpening machine, which is adjusted to the most worn tooth of the saw mechanism. Or going to a workshop that has such equipment. Result. all teeth are the same size.
  • The chain or guide bar you’re using doesn’t fit the parameters. When buying these items, the width of the groove must be considered. This is important not only for the proper operation of the equipment, but also for safety when sawing.
  • Device has a badly worn saw headset. If the device does not cut well, there may be increased wear on the headset. A visual inspection will indicate the problem. If the right or left side of the guide bar is more worn, it should be replaced with a new one. If there is increased wear, it makes sense to carry out a complete diagnosis of the lubrication system. This is often the cause of increased wear on one side of the chain.

In case of a complicated repair it is better to take the machine to a specialist workshop.

Adjusting the carburetor in the Ural 2 electron

However, it may gradually become clear that the saw‘s operating mode needs a certain adjustment, so that the fuel mixture can be adjusted accordingly. In order to make the adjustment without any difficulties, it is worth taking a screwdriver, the technical data sheet of the device itself and several wrenches of the appropriate size. It is also worth remembering about some peculiarities of such a process:

Beforehand, it is worth reading the manual of the saw, which should describe the factory settings;

It is important to adjust the saw’s work strictly in idle mode. Therefore, start the engine beforehand and keep it at idle speed. Then use the adjusting screw to bring the engine up to a level where it will increase the rpm by itself. But the chain on the bus should not move;

Further adjustment of the Ural 2 saw is made at medium rpm;

If you notice smoke coming out of the engine, turn the screw back quickly until the smoke stops. If the engine continues to run normally, it is worth adjusting the engine speed to a higher RPM when you open the throttle.

Checking injectivity of the engine is done by setting the RPM low and sharply pressing the gas lever down to the bottom. If the engine starts to stall or can’t get up to speed quickly enough, you may have to turn the screw back a little more.

When all the necessary adjustments have been made, it is necessary to fix the adjusting view using the lock nut.

These are the manipulations worth doing to answer the question of how to adjust the engine in this wonderful saw.

Aligning the ignition of the Ural 2 chain saw

This procedure does not require any special skills. You just have to do everything according to the diagram:

The engine turns on and just warms up for a while;

The owner of the saw determines for himself personally the most persistent turns of the bar headset;

After that, the saw has to be set at lower speeds;

The starter is jerked sharply. There should be a sharp increase in engine speed. If the ignition is aligned correctly, it will happen.

Knowing this simple technique, you won’t have any questions about how to adjust the ignition in this simple saw.

Running in of the Ural 2 saw

In order to achieve minimal friction between the components in a new saw, it needs to go through a certain running-in process. At this stage the saw should be set to different modes of operation. It is a question of alternating between no-load operation and various loads. In doing so:

Always begin the first few hours of operation with a few minutes at idle speed and then gradually work down to a low-medium load;

A high concentration of lubricant is made in the running-in mixture. about 15 to 1;

It is advisable to run in, which will use up about 4 full tanks.

Checking the fuel system

First you need to check the condition of the fuel filter. To remove it you need to unscrew the cap on the fuel tank. Next, an aluminum wire with a bent end is helpful. With its help take out the fuel hose, on the end of which the filter is located.

STIHL STIHL 180 chain saw system

The condition of the filter can be checked by blowing into it. If there is no air flowing through, you have to clean or replace the filter. If the air flows freely, you need to look for a blockage in the fuel hose by disconnecting it from the carburetor. Blockages can be removed mechanically or by changing the hose.

If, however, the fuel hose and filter are clean and fuel is not reaching the spark plug, the air pulse to the fuel pump may be malfunctioning.

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