STIHL 180 chain saw does not hold idle speed

Reasons why the STIHL 180 no longer revs

Almost any hand-held gasoline tool has a two-stroke engine as the power unit. These engines have advantages over four-stroke engines. They have less mass for the same power. But at the same time they got disadvantages in the form of adding oil to the gasoline and less economical. It is possible to distinguish several basic malfunctions of the saw:

• The engine won’t start. Starting a cold engine and starting a hot engine is different. To start a cold motor, the engine turns on the suction pump, which reduces air intake and increases the percentage of gasoline in the fuel-air mixture.
• The chainsaw starts and stops before it has reached the necessary rpm. You have to use the throttle trigger all the time to keep the rpm high.
• The engine stalls under load and does not develop optimum performance.

Malfunctions can be due to mechanical causes as well as electrical problems.

External inspection of the spark plug

A visual inspection of the spark plug can tell you a lot about the operation of the engine:

Damp running into the cylinder indicates a fault in the feeding system. The fuel mix is too rich. A carburetor adjustment is needed. Or the oil to petrol ratio is incorrect. The oil is overloaded and does not have enough time to be burned off during the piston stroke. Carbon deposits appear.

Clean the carburetor with sandpaper. Never use an acetylene or gasoline torch to flame the spark plug. After that the internal part of the spark plug can come off.

Adjustment

The adjustments on the STIHL 180 are simple, there is one screw that can be used to adjust the idle speed slightly.

The L and H screws, like on other chainsaws, are not in the 180’s carburetor. This is to prevent inexperienced users from twisting things which should not be twisted and thus causing damage to the chain saw.

Germans certainly came up with a good idea, but sometimes, especially after replacing the piston group and installing a non-original, the chainsaw does not idle. If you could adjust the fuel mixture this problem would be solved in seconds, but now you have to go into the main chamber and adjust the needle valve rocker.

Why chainsaw does not pick up revolutions?

Starting is a complex, multi-level process that involves almost every life support system on the saw. That is why the fact that the chainsaw loses revolutions, turns on intermittently and feels confidently only at idle should be considered from different angles.

• A faulty engine. its engine life could be exhausted and the piston rings and cylinder could be worn, deformed or even corroded;
• A faulty spark plug or coil itself. as a result, it does not produce the spark needed to ignite the fuel-air mixture;
• carburetor screws are out of balance, and there are a number of things that could cause it to stall.

STIHL chain saw malfunctions when the throttle is depressed

Why does the gasoline saw go out when I push the gas: causes and solutions

It’s not uncommon for chainsaw owners to have to deal with their breakdown, and it doesn’t matter what model of this type of equipment, since the nature of the failure is almost the same for all. Well, it’s a chainsaw stalling and then what?? It is certainly possible to include the equipment with specialized services that will repair your “iron friend” for a fee. But as the saying goes: Why pay more??

In the end, you can personally disassemble the tool and have it repaired, as the breakdown may be minor, and you will have to pay a lot to do so. But of course in order to bring your machine back to life you need to be able to understand the causes of the failure and how to fix it. So let’s learn! In this article you will be able to find answers to questions about situations where the tool simply throws after a direct touch of gas. So, let’s get started.

The basic elements of a chainsaw

Before we start looking into breakdown problems and repair tools, let’s first find out where the chain comes from. First of all, I would like to note that this tool belongs to the category of equipment, the work of which depends directly on.

It’s also important that chainsaws are equipped with a single-cylinder engine, and whose work is done on a fuel such as gasoline. It is worth noting that despite the similarities with other tools, it does not have a gearbox. And it’s replaced by a kind of chain driven single-speed gearbox, through which the chain (saw) itself is driven.

In fact, a chainsaw is a fairly simple design, but this does not prevent it from being reliable, practical and capable of fully providing immediate continuous and cyclic operation even in quite difficult conditions. This tool consists of a huge range of certain items “vital” to proper and productive operation. This carburetor, a device for. A guide bar with a chain and other features.

Before you buy a chainsaw, be sure to study all the options and choose the right brand of chainsaw.

To make your choice easier, we’ve made a chainsaw rating for you for reliability.

If you’re on a tight budget, read the article about Russian chainsaw manufacturers.

Characteristic and possible causes of failure. Fix the problem with your own hands

Chainsaws. Pretty reliable and simple design. So if you take proper care of them and deal with them based on the manufacturer’s recommendations, they fail, very rarely, and quite quickly, various types of failures are fixed. But if you find yourself in this situation and want to repair your machine yourself without calling in professionals, read the information below.

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In fact, it is impossible to unambiguously and accurately determine the reason why the tool does not start or kiosks when you press the gas, as many factors affect this. But don’t forget that starting with a chainsaw equipped with a simple two-stroke engine, conditions such as lubrication, fuel, spark and air are important for its effective operation.

So the carburetor is directly involved in preparing the fuel/air mixture, the filter cleans the air of dust, the ignition and spark plug create the spark, and the lubricant. in gasoline.

Therefore, it is necessary to look for the causes of this kind of breakdown in a sequential order, starting with simple ones and gradually moving on to complex ones. And this is an important factor of proper repair, because the person who, without considering this, starts to analyze the carburetor is putting it at risk. Since this kind of Device must be repaired or adjusted directly in special workshops (read about tuning the carburetor).

The important fact is that for the trouble-free operation of the appliance, you need to treat the fuel directly. Because if such a mixture is not properly prepared, most chainsaws simply will not start. Consequently, not every owner will guess the cause of fuel failure. Therefore, to ensure that your tool always works properly, you need to use only high quality gasoline for the mixture.

STIHL 180. Classic of the genre. Doesn’t rev up

The video examines a fairly common malfunction of chain saws

And 100% method of carburetor tuning. How to do it

Chainsaw stalls when pressing the gas,- CARBULATOR CONTROL.Chainsaw stalls when pressing on gas

This is one of the problems why, the saw stalls when pressed

gasoline saw repair And simply use the oil that is made by the manufacturer of your tool. In addition, it is important to prepare this type of mixture in an amount that you use for one or two weeks, but no more (see. Dose of gasoline and chainsaw oil).

Because otherwise the excess mixture directly in the canister will cause it to lose all of its octane properties, and this will cause significant problems with the tool.

• In addition, the cause of the disturbance may be a direct filling of the spark plug mixture while the mechanism is running. To solve this problem, you must unscrew and dry the candle, but remember that it cannot be fired in any way. Excess fuel should be drained through the hole (spark plug), wait 20-30 minutes, then put it back in place and try again to start the tool.
• Chainsaws stop when you press the gas because there is no spark. This can happen if there is no good contact between the tip and the wire (high voltage). However, if such a connection works properly, but there is still no spark, then the whole reason. is the ignition unit (electronic). It is important to note that such parts cannot be repaired, so they can be replaced. Checking the spark plug

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Don’t forget that by examining the spark plug, you can get important information about a chainsaw failure. Because if its surface is dry, it is caused by a cylinder that does not directly supply fuel. That’s why you should check your entire performance range in stages. If the spark plug is in black carbon, it means that the carburetor is not working properly, that is, it is feeding a lot of fuel or pouring oil directly into the gasoline.

Leaking carburetor and clogged nozzle

Sometimes, when the screws fixing the carburetor cover are loose or the gaskets have fallen into disrepair, the chainsaw can also experience a loss of power, to rule out the possibility of this malfunction, you must check the integrity of the gaskets and the tightening of the screws on the carburetor covers. To do this you need to remove it from the engine (the algorithm described above) and disassemble. The defective gaskets must be replaced using the replacement gaskets from the repair kit for the carburetor STIHL MC 180.

In the case when a complete check of the fuel supply and exhaust system is carried out, and there are no results. It is necessary to check the main fuel valve-nozzle. To check, it must be knocked out of the carburetor housing. All work should follow the following algorithm:

• The carburetor is removed from the chainsaw.
• Unscrew the four screws fixing the cover with a compensator, and then the cover can be removed.
• Place the carburettor on a wooden block and knock it into the carburettor interior using a bolt not more than eight millimeters in diameter and a length of 50.
• Next, you need to pick up a small hose, the inner diameter of which corresponds or slightly less than the outer diameter of the nozzle and put it on the nozzle.
• The next step is to blow into the hose. If it blows only in one direction the nozzle is serviceable, if it blows in both directions or does not blow at all the valve should be replaced.

All the actions described above should help in the problem solving connected with the fact that gasoline saw doesn’t gain revolutions, otherwise it will help to make a complete diagnostics in the service center of the producer.

STIHL chain saw cuts out 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.

To adjust the modes of operation on the body of the device are three screws designed to set the minimum speed, maximum rpm and idle speed.

On many models, manufacturers install only an idle adjustment screw to avoid incompetent attempts to adjust the device. In all variants of the device you have to make adjustments according to the recommendations of the Manufacturer.

If the adjustment of the device did not restore the normal operation of the tool, it is necessary to carry out a complete disassembly of the device with inspection. It should be understood that the carburetor is quite a complex device, if you have no experience, it is advisable to consult a specialist.

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

It is desirable to perform the work in appropriate conditions. The carburetor contains many small parts, the loss of any of them will make the device inoperable.

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Checking and repairing the muffler

Leave clogged mufflers to soak in warm water and detergent, then carefully wipe and dry them.

Muffler failure leads to loss of power during work and idling stops. The muffler may seem simple but it is also important to keep an eye on it. Quite often the muffler becomes clogged. Wood dust, sawdust, resin particles can get on the grill during operation. High temperature promotes their adhesion and accumulation, the exhaust gases also form deposits on the surfaces of the spark arrester and other parts. The layer that builds up over time reduces the capacity of the muffler and prevents the normal removal of exhaust gases. The engine suffocates, so to speak.

Repair is simple and many tool owners can do it. The unit should be removed from the engine and the openings covered with a rag or other material. If the layer formed is too hard, all parts may be left to soak in warm water with detergent. After softening the deposit, the parts should be washed with a rag or soft brush, wiped thoroughly. You can blow out any inaccessible parts with compressed air or dry them with a hair dryer. The use of mechanical means of removal is undesirable.

For a proper operation of the muffler for a long time, it is necessary to use manufacturer’s recommended lubricants and watch out for expiration dates. The mixture should be prepared just before use and consumed completely.

If your STIHL STIHL MC 180 chain saw stops when idling, fails to pick up power when accelerating or stops even though it is running, have the fuel system checked and have the sump checked for leaks. It is possible to do it yourself, but it requires certain skills. If you don’t know much about 2-stroke mowers, you may want to call a professional. к. This technique is quite capricious and any mistakes are expensive.

The main causes of chainsaw failure

Although the STIHL chain saw is a simple machine, it does exhibit occasional malfunctions that can only be corrected through disassembly. Examples of malfunctions are as follows:

• chainsaw does not pick up speed;
• The chainsaw stops functioning in the cut;
• The chainsaw does not start and then stops;
• chainsaw loses power;
• Your chain saw stalls when you press the button.

Most often malfunctions are associated with motor malfunctions, as well as problems with other systems and assemblies. Proper handling of the machine is important. If all the rules of use are followed, problems are likely to be the most obvious. When searching for the cause of trouble it is advisable to begin with checking the simplest part of the chainsaw and end with the most complex.

Muffler inspection and repair

A clogged muffler should be left to soak in warm water and detergent and then be thoroughly cleaned and dried.

A muffler malfunction causes the tool to lose power when running and stopping at idle. Despite the apparent simplicity of this part, it is also important to keep an eye on it. Quite often the muffler is clogged. When working, wood dust, sawdust, resin particles can get on the grid. To reduce the risk of static spark plug clogging, use a soft brush or wipe as needed. The layer that builds up over time reduces the capacity of the muffler and impedes proper exhaust emission removal. The engine suffocates, so to speak.

Repair of this unit is not complicated, it is within the power of many tool owners. The unit should be removed from the engine and the openings should be sealed with a rag or other material. If the layer formed is too hard, all parts may be left to soak in warm water and detergent. After softening the deposit, wash the parts with a cloth or soft brush and wipe down thoroughly. Inaccessible places can be blown with compressed air or dried with a hair dryer. Using mechanical means of removal is undesirable.

For the normal functioning of the silencer over a long period of time it is necessary to use lubricants recommended by the manufacturer, taking care of their expiration date. The mixture should be prepared just before work and consumed completely.

Checking the spark plug and ignition system

The spark plug should be replaced annually, according to the manufacturers recommendations, regardless of how often the tool is used. Failure to follow these tips leads to a quite natural result: malfunction at idle speed, subsequent failure of the.

Typical defects in the ignition system are as follows

• The spark plug is flooded with fuel at startup. It is necessary to remove the spark plug from its seat, dry it and if possible blow it out with compressed air. Drain residual fuel from the cylinder through the setting hole, blow out with compressed air. Then install the spark plug, connect the high-voltage wire, start.
• No spark on the spark plug electrodes. Disconnect high voltage cable and check for spark. If the spark is normal, check the connection, fix the detected defects. Lack of spark on ignition cable indicates ignition unit malfunction. This device is beyond repair and must be replaced with a new one.
• The gap between the electrodes of the spark plug is disturbed. This parameter for different types of devices can be in the range from 0.2 to 0.5 mm. Check and adjust with a special dipstick or caliper. Consult the instruction manual of the tool for the necessary value.
• By the appearance of the plug you can determine the direction of the search. 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.
• The presence of black soot or carbon deposits on the electrodes indicates improper carburetor adjustment or clogging of the air filter. Probably low-quality fuel with high oil content is used. Electrodes have uniform gray color and brown deposits on insulators when ignition system is operating normally.

Air filter

On the World Wide Web, it is reported that a clogged air filter can cause a STIHL 180 chain saw to shut down. I would like to refute this untrue information and inform you that the carburetor STIHL MS 180 is equipped with a compensator, which is designed and installed to bypass a dirty air filter for the normal operation of the STIHL chain saw 180. Of course it will have less power if the air filter is clogged, but it will not choke. The piston assembly may be worn and may need repair of the STIHL MS 180 piston.

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If you see the first signs of power loss (low RPM) with a STIHL chain saw MS 180, it is absolutely essential that you call in a specialist or have it checked and repaired yourself. There are not many reasons for loss of power and you can cope with them even without certain skills.

Chainsaw at the cottage, in a private home. not an uncommon occurrence. It can be amateur, semi-professional and professional. The choice depends on the frequency and complexity of the activity. It greatly simplifies the work of preparing firewood, helps to quickly put the log cabin. If it breaks, in most cases it is possible to repair the chainsaw with your own hands. Equipment failure can be associated with idling problems, the mechanism does not start or trots.

The principle of repair for all chainsaws is about the same. Make sure you read the instructions before you start work. The main difficulty in this type of equipment is not the repair itself, but the search of the source of failure.