Why the chainsaw does not rev up and how to fix it
A stable combustion engine is not only dependent on the condition of the internal components of the combustion engine but also on the external factors with which it interacts. A disturbance of the rhythm entails various problems, one of which is the complete stop of the mechanism when you try to increase the RPM. This can be caused by a decrease in the efficiency of certain components. How to identify a defective element and fix the problem, told and shown in this article.
An imposing system design, with many essential components, the failure of each has a direct influence on the behavior of the tool. Unintentional engine stoppage when trying to increase the shaft speed, most likely due to insufficient supply of combustibles. The air-fuel ducts get clogged during the operation, their flow capacity decreases and the chainsaw does not develop its full power because the engine does not have enough “nutrients”.
In addition to an uninterrupted supply of fuel and air, the engine needs an open channel to remove gases. Caustic substances form soot, gradually reducing the size of the perforations, and as a result, the chain saw doesn’t develop speed. The cause is in the muffler, and may not be visible with a superficial inspection. The problem becomes acute after several tens of hours of using the tool (the time depends on the quality of the fuel).
If the valve (breather) of the fuel tank is clogged, negative pressure is created in it, until the pump stops pumping at all, interrupting engine operation. This problem is not only at high revolutions, but also appears very quickly at a gas-pressure. Similarly, with a clogged breather, the chainsaw does not keep idle speed and shuts down within a few seconds after starting. To check the valve capacity, it is enough to unscrew the fuel cap, immediately after an unintentional stop. If when unscrewing the valve air is sucked in sharply, it means that there is vacuum and the breather plug needs cleaning.
The carburetor and the hoses connected to it play a major role in pumping fuel. The first thing to do is to check the hoses for leaks and cracks. If the fuel pipe is okay, you can adjust the carburetor or clean the filter. All the steps of this process are described below.
Decreasing engine compression, due to the destruction of compression rings or the formation of scuffing, breaks the operating cycle and muffles the system when the revs. A quick visual check of this assumption can be made through the exhaust port by removing the muffler. Ideally, you should use a compressometer by screwing it into the spark plug hole and pulling the starter handle a few times. Depending on the volume of the engine, the compression varies from 160 to 180 PSI. To be absolutely sure, it is better to ask the seller or the manufacturer of your saw model for this value.
Lack of timely spark and ignition, leads to refilling the chamber with a new portion of fuel in addition to the already available. To overfill, 3 or 4 “idle feeds” are enough, as a result the plug contacts will be flooded and the tool will not work anymore (until they are dried out). This problem often occurs with overheating when the resistance of the defective coil increases and at high rpm the chance of flooding increases. Also, the cause could be contamination or improper gap of the spark plug contacts.
The ignition module should be checked immediately after an unexpected hot stop and after it has cooled down completely. Simply unscrew the spark plug from the socket, connect the cap with the spark plug wire, touch the metal surface of the engine and pull the starter. If the frequency of the spark formation of the hot and cold system is drastically different, then the coil is defective and needs to be replaced.
Troubleshooting
After considering the possible causes and finding out why the chainsaw won’t pick up, you can move on to the procedure for restoring performance. The following guides are laid out in order of difficulty of repair: from the filter elements, to the carburetor.
Air and Fuel Filter
The first and easiest thing to do is to replace or clean clogged filter elements. To access the air filter, simply remove the upper housing cover. After conducting a visual assessment and determining a high degree of contamination, the element is removed from the hole in the carburetor. The nylon filter only needs soap and water to wash out the oil clogged pores, dry well, and then re-install. The felt one is inefficient to clean and is best replaced with a new one (although you can wash it as well).
The fuel filter is dangling in the gas tank, attached to the end of the hose of the same name. Determine the end of life can be determined by the gray or yellow color, and if the chainsaw does not pull, most likely the problem is in it. You may pull it out with the help of a hook made of a thin (2-3 mm) metal bar, or with nimble fingers. Regardless of the material (nylon, felt), the fuel filter cannot be cleaned and needs to be replaced. It is better to use ceramic-metal or felt ones, which will protect the carburetor from dirt and additives much better than nylon ones.
Muffler
Long periods of non-maintenance or non-instructional use of the chain saw affects not only the filters but also the exhaust system and gradually clogs the vents. If you see fumes coming out of the muffler as if it were pressurized and the chainsaw would not pick up when hard-pressed and stopped, it would be an item that needs to be checked. To remove the muffler, simply unscrew the 2 fixing nuts and (possibly) a couple of screws, then loosen slightly and remove from the studs.
If it’s collapsible, it’s easy to get to the components. Separate, soak everything in kerosene, Kavisan-Carbon S or similar means for cleaning parts (for an hour), then clean with a metal sponge, brush or sandpaper. Non-disassembled mufflers are either replaced or burned until all the soot turns to ash, which is then simply shaken out.
Fuel tank valve
Less unambiguous, but quite popular cause of abrupt engine stalling (especially abrupt, when you press the gas). How to determine if the breather valve is clogged is described above, and the process of fixing the problem is shown here. First of all, the element must be removed from the gas tank. The breather valve is located under the carburetor (usually on the left, but on Husqvarna 236. on the right) and for convenient access, it is better to remove the cylinder cover, unscrew two shock absorbers and lift the crankcase. The valve is firmly jammed into the gas tank hole and can be removed by squeezing it out from the inside with a screwdriver or a strong metal rod.
The most popular types of valves are cone-shaped and float-shaped. It is better to replace these elements with new ones, but if there is no possibility, you can gently clean them with a needle and kerosene. For the convenience of installing the breather in its native place, it is better to use tweezers or narrow pliers.
Carburetor
The main mechanism responsible for an even supply of air-fuel mixture into the combustion chamber. If the chainsaw loses power and shuts down at high speeds because of the carburetor, then it gives the wrong fuel to air ratio and needs adjustment or service. It’s best to start with the tuning screws, since they are freely accessible and are quite often knocked off, causing the problem.
Most modern carburetors have 3 adjusting screws: L (Low) for adjusting fuel quality at low RPM, H (Hight) for high RPM (when the gas pedal is held down), and T (TAS. Throttle Adjustment Screw). to change the amount of fuel delivered at idle speed. We only need H, L, and a long slotted screwdriver. For convenience and clarity, it is better to adjust on a running saw, remembering the number of revolutions, so you should be very careful and especially attentive.
Stalls at idle
Sometimes the saw cuts out at idle speed and a clogged muffler is a very frequent cause. It’s easy to clean it yourself, you don’t need a tall expert to do it.
Cleaning is not the only alternative, but be very careful not to damage the inner workings of the machine.
To adjust the carburetor, you need to find the two bolts with the letters L and H. The last one needs to be turned, just a little, only a half turn. It’s in charge of the revolutions of the tool and will raise the idle speed if needed.
STIHL 250 chain saw Starts up and shuts down Why?
The problem is this. Saw a STIHL MS 250 six years in the works. No oil for chain lubrication (it does not depend on the air temperature), to be precise, it does not go to the bar, but at the same time it leaks heavily into the hole under the muffler. I cleaned it, I rubbed it, but it’s still the same. Tell me what else I can do?
Sometimes there is. There is a plastic plug under the muffler first. For some reason it sometimes squeezes out. You can do this, here’s what you need: A socket for a “on 8” wrench. remove the muffler. A long M6 branch has a length of about 100 mm or a standard one with an extension. M6 screw that is not a sting and nut. Metal hacksaws. Tisochki. Here is the technology: 1. Remove the muffler. 2. Remove the oil spill. 3. We drop a small piece of cloth with a little tampering into the hole so it can be removed later. Do not hammer in tightly! 4. Unscrew the M6 thread 5. 6 thread the threads in the hole, clean off the shavings and remove the cloth from the hole with a hook. 5. from screw M6 cut a piece of thread length 5. 6 (or millimeters 5-6), on this piece we cut a slot under the screwdriver. Cork ready. (The aforementioned nut to clamp the screw and not damage the thread). 6. screw the plug into the hole. You need to carefully. you can not screw it in deep or it will block the outlet. You can install a wire about 2 millimeters in diameter from the bar mount and screw the plug in touching the wire. 7. install the muffler and check the oil supply.
I bought a Stil MS 250 chainsaw. After a week I found fuel oil leaking where the crankcase was attached, from under the screw, it is straight up, closer to the handle. There is a suspicion that the crankcase may not be sealed. What to do?
Don’t worry. There are no external leaks. No sweat, no such manifestations. Only by implication. At first some increase in power and increase in maximum rpm. Then, as the leak increases, there are problems starting the idle, then problems starting.
Saw starts and stops. How to fix it?
You must first remove the fuel filter from the hose to the tank and try a little work without it. Do not give anything. check the impulse hose. You can not see it well, but you can see. Use a small flashlight to look into the gap between the top of the fuel tank and the bottom of the carburetor box. The hose should not hang loosely. It should be put on the nipple applied with the body of the carburetor box. Sometimes this happens. when the engine snaps, it breaks. If the hose is in place, it is more difficult to. Shake the right end of the crankshaft. If there is even a small gap, you need to do a diagnosis. The screws to secure the sump may be loose, there may be damage to the oil seal (more often. right). However, I might suggest moving the carburetor with a working saw and try to see if the.
READ How to Properly Chain a STIHL Chainsaw
I have a STIHL MS 250 chain saw I bought 1.5 years ago for making firewood. The resource is clean, no more than 4 hours a day, and the rest of the saw should be provided while you work? If so, how much? The saw runs in the fall/winter, about 40 m/hours a year.
Rest there is easy. hot saw can not be filled, then after developing the fuel tank you need to rest to cool the chainsaw. There is no break time listed anywhere.
The tool works fine, but when it restarts (t. Е. Warm), it will not start. Should I change the spark plug or wait for it to cool down?
There are two options. or there is nothing to burn or nothing to ignite. That is, if the filter is clean, the carburetor is not removing the intake for some reason when it starts warm (and after it starts cold), and the saw does not have enough air or when the spark plugs get hot. spark disappears. It is possible to re-enrich the mixture. Try not to tighten the L screw too much. There are 3 screws on the carburetor. T. Idle, L. Low speed, H. high speed. On the right side of the air filter cover there are holes marked opposite these screws. (it is best not to overtighten the H screw).
Stil MS 250 chainsaw, 2 years in operation, but recently started noticing. if it takes a long time (more than 3 months), at landing or idle, or at other times at high idle rpm the chain twists. The gasoline tank will run and everything comes back to normal. What is the problem?
The chainsaw stalls on side tilts.Causes.How to fix
Piston buy carburetor buy STIHL Parts
Chainsaw starts and stops
does not work stalls. It won’t cut. How much about the secret here it is.
If you do not produce gasoline from the carburetor, this may be the reason. Gasoline evaporates residual oil, diaphragms in carburetor get stuck. In addition, the fuel mixture over time deteriorates, loses its properties. Even in a container the mixture is not recommended to store more than 2-3 weeks.
I bought this tool. I came to the country house and started, I tried to see it. It is fine. Well, I move the universal lever to the stop position and it doesn’t stop! Anyway, reset the cover, closed the contact. Can you enlighten me on the device to stop the motor? I only saw one contact on the spring, and the other is stuck in the universal arm, and there is nothing else! Seems to be some sort of record, but which one?
At the end of the wire, a normal “mother” type contact. It is inserted into the appropriate socket on the lever, and the contact spring should touch it when the lever is “off”. No intermediate parts. The spring on top should be. It has less of a contact function than locking the shaft in different positions.
READ How to adjust the carburetor on a Partner 350 chainsaw
I use a STIHL MS 250 chainsaw. I don’t have a saw yet, I have no experience, so a few questions. 1. I was surprised by the operation of the brake, or rather, with what sound it comes on, a sharp such unpleasant click, the whole saw resonates, is that normal? 2. The drive sprocket is somehow all black and red, it should look as if everything is silver-metal. What does that mean? 3. There was no bus in the box, it was given separately. Isn’t that a reason to be wary?
The brake operates with a fairly loud click and a bump is felt. There is a powerful spring, there is something to snap. The asterisk is not clear, you need to look. Bus and chain. Yes, separately. The main thing is that both. Stihl’s.
How to check the fuel mixture and plugs
You shouldn’t pour the first fuel mixture you find into your chainsaw. Regardless of whether you run a Chinese model or a modern, reliable Husqvarna, fuel mixture should be mixed according to the instructions in the tool’s component manual.
If you do not plan to use the equipment in the next few months, the fuel needs to be drained. Otherwise it will oxidize and ruin the tool. The same goes for off-season or when the chain saw is not in use.
The condition of the spark plugs, which are responsible for the ignition of the machine, check the following way:
- Remove the spark plugs and see if there’s fuel in the tips.
- There may be soot on the spark plugs. It clogs the gap between the parts. The optimum clearance value is 0.5-0.65 mm. It is easy to get rid of the soot if you use light grit sandpaper or a brush with metal bristles.
The air filter is dirty
Making sure the air filter is dirty is easy enough. You just need to remove it and start the chainsaw without it. If the saw runs fine, that means the saw is in and you just need to change or wash it, depending on its type. And don’t worry about the chainsaw working for a while without dust protection. If there is no dust around, everything is fine.
So, remove the air filter. To do this, remove the cover from the top rear of the chainsaw, which can be secured either with screws or some kind of lock that you just need to turn or tear off.
If the file works properly after removing the filter after starting, it means that the filter is dirty.
Air filter or felt or nylon. The first resembles absorbent cotton or sintepon, and the second resembles a small nylon mesh stretched over a plastic body. The wool should be replaced with a new one, but the nylon can simply be washed in soapy water, dried and put back.
Well, then we use the chainsaw safely.
How to properly start a chainsaw?
We wouldn’t want it to be so, but the human factor is often the cornerstone, which is the source of many technical problems, which are then eliminated by the heroic efforts of the operator. The same is true with a chainsaw, which not only needs to be used and stored properly, but, oddly enough, even started.
All chainsaw models have their own specific features, but usually their assembly and startup schemes are very similar. Let’s consider step by step how to start your acquaintance with the saw and how it can be put to work.
Study the instruction manual, paying attention to the starting and stopping mechanism, which is usually given separate attention; Push down the adjustment lever with the throttle first; Jerk the starter knob sharply until the ignition starts, then move the adjustment flap to the upper position; Resume the starter, do not stop it until the system starts; Push the gas once and immediately release it, warming up the tool; Fix the lever in the 1st position; Start the engine with the highest position of the damper
Check filters and carburetor
Frequent causes of chainsaw malfunctions are filter or carburetor malfunctions.
Check the fuel filter
If the fuel filter is clogged with dirt, it cannot pass enough fuel. As a result, the chain saw stops when you press the gas. The fuel burns too fast and a new batch of fuel has no time to be delivered to the system. If the fuel filter is clogged insignificantly, a considerable drop in power at maximum engine speed is observed.
Chainsaw fuel filter
Air filter
If it becomes dirty you won’t be able to operate your chain saw properly. But many models are equipped with a special compensator that performs air intake in a different way. It allows to do it even if the filter is clogged, which has a positive effect on the machine’s performance.
Chainsaw air filter and spark plug location
In such cases the output will drop considerably, but the chainsaw will not stutter. This can sometimes be observed even when the piston is worn.
The carburetor
Frequent cause of failure of such tools is called a carburetor failure. It is recommended to check this element if you have certain skills. It is better to give the device to a specialist who will make quality diagnostics and adjustment with a tachometer.
This is especially true if the saw stops when idling. It is advisable to check the muffler. It is because of the accumulation of exhaust gases that the saw shuts off at idle and does not work normally. It often happens that the saw has not been used for a long time. When it begins to operate again, one notices that when starting at idle the unit runs well, but when pressing the gas. it stalls. The main reason for such a negative phenomenon. a jammed nozzle valve.
To check the presence of such a malfunction, it is necessary to remove and disassemble the carburetor. To do this, you need to unscrew the two nuts where the air filter was attached. It is removed along with the engine control lever. The choke control line must be disconnected from the carburettor.
Removing the carburetor cover
In the next step, this detail should be pulled slightly toward yourself, disconnecting the fuel hose. This must be done very carefully and with a special plug. It will come in handy to close the hose, because fuel will be released from it.
When you managed to remove the carburetor, you need to clean it of dirt and blow on it. Only then can you try to unscrew this part. It is necessary to take out the main cover and, with a small screw, carefully knock out the valve. It should only let air through in one direction. If it comes out on both sides, it needs to be replaced.
Exploded carburetor
Checking the filters and carburetor
A common cause of chain saw malfunctions are filter or carburetor malfunctions.
Checking the fuel filter
If the fuel filter is clogged with dirt, it will not be able to pass enough fuel. The chainsaw will stop if you touch the gas. Fuel burns too fast and the new portion of it does not have time to enter the system. If the fuel filter is clogged insignificantly, there is a considerable power loss at maximum engine speed.
Chainsaw fuel filter
Air filter
If it becomes clogged you won’t be able to operate your chain saw. But many models are equipped with a special compensator, which performs air intake in a different way. It is possible to do so even if the filter is clogged, which is good for the performance of the machine.
Location of the air filter and spark plug of the chainsaw
In such cases, power will be greatly reduced, but the saw will not stall. Sometimes this deterioration is also observed in the case of a worn piston.
Carburetor
A common cause of malfunctions of such a tool is called carburetor failure. Checking this element is recommended if you have certain skills. It is better to give the device to a specialist who will perform qualitative diagnostics and tachometer adjustment.
This is especially true when the saw stalls at idle speed. It is recommended to check the operation of the muffler. It is the accumulation of exhaust gases that causes the saw to idle and not work normally. Very often it happens that the saw has not been used for a long time. When it begins to operate again, notice that when starting at idle rpm the unit works well, but when you press the gas. it stalls. The main reason for such a negative phenomenon is a jammed nozzle valve.
To check if this is the case, the carburettor must be removed and disassembled. To do this, it is necessary to unscrew the two nuts where the air filter was attached. It is removed along with the engine control lever. The control rod of the air flap from the carburetor must be disconnected.
Removing the carburetor cover
The next step is to pull the part out a little, disconnecting the fuel hose. Be particularly careful when doing this and make sure you have a special hole plug beforehand. It comes in handy for covering the hose, as fuel will be released from it.
When you have managed to remove the carburetor, you need to clean it of dirt and blow on it. Only then can you try to unscrew the part. You need to take off the main valve cap and use a small screw to carefully knock the valve out. It has to let air in one direction only. If it comes out from both directions then it needs to be replaced.
Exploded view of the carburetor
Your Partner 350 chain saw will start and stop
Why does the chainsaw quit when you hold down the gas??
Hello! If you ended up on this page, then apparently your chain saw stops when you press the gas, and you want to find out why this happens and what to do about it. I’ll try to help you with this dilemma by analyzing the more common causes of such a failure, as well as ways to fix it.
To begin with, I will write for users-beginners that many chain saws before work asks to warm up the engine at idle for about one minute. Why does the chain saw start and stop? causes and. Your STIHL chain saw isn’t going to start or it just won’t start. As long as the engine is not warmed up, the saw may stall when you add gas.
So, if the warmed up chainsaw can idle, but it stops on load, it means that:
- carburetor is incorrectly adjusted or clogged. the most common case;
- it does not have enough air and the air consumption increases sharply at higher engine speeds, the air filter is dirty (this is a very rare case, as the filter is saturated evenly and the user does not notice at first the loss of power)
- it lacks fuel, the consumption of which also increases with increasing speed. this means that the fuel filter is dirty (also an infrequent case);
- Well, the most disgusting case, if between the piston and the cylinder wall is an excessive friction associated with a lack of oil in the fuel consistency. after such work chain saw, you are likely to fly into the repair of piston group, because the piston and the walls of the cylinder formed zababyaki interfering with the saw.
Not enough oil in the fuel mixture
First let’s look at the most annoying case. Why? So before you do any manipulations with the filters, you better make sure the oil and gasoline are mixed in the right proportions.
Here, however, it is worth seeing that if your saw has been started many times (e.g. 10 times), but continues to start and later stops again when you increase the rpm, then there is probably nothing wrong with the fuel. There are several reasons for the lack of lubrication on the Partner 350 chain saw, and in the plug pours. Otherwise, it would have simply finished starting up in general.
READ Why is the Chain on a Chainsaw Stretching?
But still I recommend to dispel the slightest doubt about the properties of fuel, as the saw you have stalled at revolutions for the first time. Because, if the reason is fuel, then, as already written above, you can get into expensive repairs. But it can still work out. To dispel doubts is to drain the old fuel from the tank and pour the freshly made, in which the oil and gasoline are mixed in the right proportions.
It is better to look at the ratio in the manual to the saw. What to do if your chainsaw starts and stops. Quite often a chainsaw Partner stops when you click and does not start the chain saw. To do what to do if your Partner 352 chain saw won’t start, see how to disassemble it (video Partner 352, won’t start your chain saw). STIHL 180, Partner and other chain saws won’t start. If you don’t have it, check the ratio on the oil carton. It is usually 1:50 or 1:40. Why does the chainsaw stall under load the chainsaw starts and stops, the reason for the chainsaw is no longer a luxury, but a necessary tool for anyone who has at least some out-of-town. If you use oil “non-native” (well, for example, for chain saws STIHL “native” is also not enough STIHL), I recommend using the proportion 1:40, even if the oil package says 1:50.
Chainsaw stalls when throttle
I can’t stop when I step on the gas.My Partner 370 chain saw just started to cut off with the slightest pressure on the handle.
Repair of PARTNER chainsaws. Why the STIHL 180 chain saw stops and fires on. Starts. but shuts off right away.
Starts. Why does the chainsaw stall? PARTNER chainsaw repair. can be made with your own hands.
For exact dosage, I personally use a syringe and measuring cup, which clearly can measure one liter of gasoline. If your chainsaw won’t start then Champion 55, that will start and stop when. chain saw fails to start in chinese chainsaw.Repairs and does not start. I pour a liter of gasoline in a container, pour 25 (at 1:40) or 20 (at 1:50) cubes of oil in a syringe and add it to the gasoline.
READ STIHL 180 chain saw fuel consumption
After making a new mixture, drain the previous mixture from the tank, in which we are unsure, and pour a fresh newly prepared.
Now that you’ve done everything to dispel any doubts about fuel quality, let’s move on to further action.
As I wrote above, a lack of oil can cause scoring on the piston and cylinder walls. and almost always does. Why the chain saw starts and fails to start Why the chain saw starts and stops. If you are lucky and no scoring has occurred, with a new fuel mixture mixed in the right proportions the chain saw should start working fine.
If scoring occurs, it may start and stop a few more times and then stop starting at all. In this situation I feel sorry for you, because you will probably have to replace the piston group now, which will cost a lot of money.
If it is still starting and stopping at high rpm, it is time to manipulate the filters.
The air filter is dirty
Checking whether the air filter is dirty is quite easy. You just need to take it off and start the chainsaw without it. if the saw works fine, then it’s the problem and it just needs to be replaced or cleaned, depending on its type. And don’t be afraid to let the chainsaw go without dust cover for a while. if there’s no dust cloud around you, you’re fine.
So, remove the air filter. Top Reasons Why a Chainsaw Stops When Not Starting or Stops, Like STIHL or STIHL. Top Reasons Why a Chainsaw Shuts Off When It Starts or Stops, and Partner. To do this you need to remove the cover from the back top of the chainsaw, which is attached either with screws or just a lock, which you just need to turn or unclip.
Hot Trouble
If you notice that the chainsaw starts without any problems without warming up and stops after warming up. And it won’t start until it cools down, then there are several possible problems.
First, there may be a leak in the hose, packing, or gasket somewhere. Second, check the muffler for debris. The third reason is in the cylinder-piston group (CPG), whether there are any scrapes or irregularities.
Sometimes it is necessary to adjust the carburetor. Another important cause of malfunction, is the ignition coil. In cases where it fails, the spark is lost or becomes very weak, which is not enough to ignite the fuel mixture.
There are cases when the master is trying hard to start the engine, then on cold, then on hot, thereby pumping the fuel. Here you need to take hold of yourself, set the choke to “hot start” and gradually start the tool. In this case, knock down the revolutions to almost idle and 40-45 seconds it warms up.
Reasons why a chainsaw stops working under load
This article on the construction site will discuss the main reasons why a chainsaw may not start or stop when loaded.
The most common of all, are the following causes:
Why does the chainsaw’s power drop?
The same goes for the air filter, it should be cleaned immediately if this kind of problem occurs. Now for the spark plug, if it is very dirty it is also cleaned and adjusted if necessary. It is the wrong gap between the electrode of the spark plug on the chainsaw that can cause it to stall, and generally run extremely unstable.
STIHL MS 180 repair / carburetor disassembled and reassembled / catches idle
Filters often get clogged, in particular when the chain saw is operated more than once a day. There is an option to disconnect the air filter and rinse under running warm water. Dry out thoroughly before putting the chain saw into operation.
If after disconnecting the fuel hose from the carburetor with its use does not flow fluid, it means that it is clogged. It can be cleaned or replaced with a new one.
If you use the tool occasionally, the gasoline pump can break down. Each part has its own use-by date. It should be replaced as it is also called, contact a service center.
Horizontally, the fuel tube is on the day of the tank, if the tool is tilted, the fuel will not have the opportunity to cover it one hundred percent. This is the reason that the chainsaw stops working when it is tilted, because the tube is levitating in the air and it is not getting the right amount of consistency.
If you see a chain saw starting without warming up, but after warming up it stops. And it won’t start until it cools down, there could be a few things wrong with it.
All, you have a leak in the hose, packing or gasket. At, inspect the muffler for carbon deposits. The 3rd reason is in the cylinder-piston group (CPG), there are no scuffs or irregularities.
This lightweight and compact model is used for household chores, but despite its optimized performance, it sometimes fails to start the STIHL chain saw. The problems are manifested in the fact that the engine starts and stops, runs unstable, can not develop the proper power or suddenly climbs high revolutions.
Why a STIHL chain saw won’t start
To first diagnose the cause, first check the gasoline pump, spark plug appearance, fuel intake, carburetor and filter functionality. Pay attention to the serviceability of the cylinders, pistons, muffler, crankshaft bearings. After precautionary measures, try to start the chainsaw. Lack of lubrication of friction parts is also a factor for poor performance.
No spark
The spark plug is checked. Various factors influence the function of the element. When testing the mechanism, the causes are identified:
Such conditions cause a build-up of soot on the spark plug pins. Corrosion of the cable becomes the reason why there is no spark in half of all cases. This occurs because the gap between the module contacts changes. To check the spark, do the following
- The tip of the high-voltage cable is removed;
- the spark plug is unscrewed;
- Replace the lug;
- the spark plug is leaning against the cylinder with its wide end;
- Start the starter.
If a bright spark resembling lightning appears between the electrodes when starting, the ignition unit is serviceable. If there is no flash, the entire element is cleaned and the gap between the conductors is adjusted. Sometimes there is no gap between the flywheel and the ignition coil. When the flywheel is rubbing, scratches are visible on its exterior.
Faulty ignition coil
The module or coil is not disassembled, its suitability is difficult to detect without testing devices. Modern ignition systems are rugged, lightweight and small in size. They are characterized by near-failure functionality. Problems with chainsaw malfunction due to the ignition coil can be fixed yourself.
Test the lead wires for faults (in. ч. internal), which are caused by vibration leading to friction. If no cracks are found, the ignition coil needs to be replaced. Sometimes a weak, barely discernible flash when the saw heats up indicates a module malfunction. This is due to an increase in coil temperature, which leads to an increase in transistor resistance.
The peculiarity is that the spark may appear at the beginning of operation, but after prolonged use it becomes dull and disappears. Modern ignition coils are not repairable in a home workshop, so replace them with suitable elements.
Fuel supply
after unscrewing the plug there is a wet deposit on its surface. This indicates that there is too much gasoline in the combustion chamber. This is the reason why the tool does not run or stalls, t. к. the fuel does not ignite.
Another retarding factor is a clogged breather. a small hole in the lid of the gasoline tank. Clean it with a needle, or the STIHL MS 180 chain saw will not start. To find out if the fuel supply is faulty carry out the following actions
- the spark plug is removed;
- pour a syringe 2 cc of petrol into the hole in the plug;
- put the ignition device in place and put on the cap of the high-voltage wire;
- turn the lever to the hot start position;
- jerking the starter knob a couple of times.
If the tool starts and immediately stops, then the fuel line is tested further. Check the fuel filter, check the splash out of the crankcase, check the continuity of the partition in the pump when unscrewing the cap.
Crankshaft bearings failure
If the bearings are defective, a slight backlash is felt. To check, turn the STIHL MS 180 handwheel from side to side. The movement indicates that the handwheel is moving toward the electrodes with its own magnets, so there is no spark. To remove the mechanism remove the cutter, remove the filter and clutch cover. To stop the crankshaft, remove the manual starter cover and retighten the two bolts.
Unscrew the clutch with the spanner in a clockwise direction. Remove the drum and sprocket, replace the old clutch and screw it all the way in. Block the crankshaft to prevent breaking the starter motor. Assemble the mechanism in reverse order. To tighten, the brake handle is tilted forward, the tool is started, then unbraked.
Bearing with defects (holes in the cage are enlarged) are detected less frequently. To determine, disassemble and measure with a micrometer. Broken bearings are evidenced by regular knocking. In this case an urgent repair is required, i.e. к. if the integrity of the crankshaft is broken, the piston group and cylinder will fail.
Fills the spark plug
In this case, the spark is unable to ignite the fuel, which in large quantities goes into the furnace to burn the combustible mixture. If the spark plug pours, the carburetor is defective or the cold engine does not start correctly. Blow off the engine, the procedure is performed with the ignition off and away from open flame. To ensure fuel ignition at startup, clean mechanism:
- unscrew the spark plug, wipe dry, dry for half an hour;
- A large layer of soot is removed with a file;
- The gap between the contacts is adjusted;
- Turn the instrument upside down and drain off the gasoline;
- in this position pull the starter several times (to remove fuel residues);
- Reassemble in reverse order.
Additional tips
The first thing you should remember when buying this kind of tool is that certain saw parts should be replaced with new ones when their working life is over (passport period). This is the reason why you should always have the instructions at hand, because they describe everything in detail. Such parts include: a sprocket (driving), a bar, a part of the system (anti-vibration) and the chain. Because it should not be forgotten that if this “stuffing” is not replaced with new in the required time, these worn parts will adversely affect the other parts of the chainsaw. It is for this reason, quite often make a check of the depth of the immediate depletion of the teeth. You have to remember that it should not be higher than 0.5 mm.
For a preliminary diagnosis of the causes, check the operation of the gas pump, the appearance of the spark plug, the fuel flow, the functionality of the carburetor and the condition of the filter. Pay attention to the functionality of the cylinders, pistons, muffler, crankshaft bearings. After the preventive measures the chain saw is tried. Lack of lubrication of moving parts is also a factor for poor performance.
No spark
Checking spark plugs. Various factors affect the function of the element. When testing the mechanism, the causes are identified:
Due to operation in such conditions, soot accumulates on the contacts of the plug. Subsequent corrosion of the conductors causes no spark in half of all faults. This happens because the gap between the modular contacts changes. To check the spark, do the following:
- remove the lug from the high-voltage cable;
- The spark plug is unscrewed;
- the lug is put back in place;
- the spark plug is leaning against the cylinder with its wide end;
- Start the starter motor.
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If during start-up a bright spark that resembles lightning appears between the electrodes, then the ignition unit is defective. If there is no flash, the entire element is cleaned and the gap between the conductors is adjusted. Sometimes there is no clearance between the flywheel and the ignition coil. When the flywheel rubs, scratches are visible on its exterior.
Faulty ignition coil
Module or coil cannot be disassembled; its suitability is difficult to determine without testing aids. Modern ignition systems are sturdy, lightweight and small in size. They are characterized by almost fail-safe functionality. Problems with chainsaw malfunction due to the ignition coil can be repaired by yourself.
Test lead wires for damage (incl. ч. Internal), which is caused by vibration resulting in friction. If no cracks are found, the ignition coil must be replaced. Sometimes a weak, barely discernible flash when the saw heats up indicates a module malfunction. This is due to an increase in temperature of the coil, which leads to an increase in resistance of the transistor.
The peculiarity is that the spark can appear at the beginning of work, but after prolonged use it becomes dull and disappears. Modern ignition coils are not repaired in the home workshop, so they are replaced by suitable elements.
Fuel supply
After unscrewing the plug, on its surface there is a wet film. This indicates that there is too much petrol in the combustion chamber. This is the reason why the tool does not work or stalls, i.e. к. Fuel does not ignite.
Another retarding factor is a clogged breather. a small hole in the gasoline tank lid. Clean it with a needle, otherwise the STIHL MS 180 will not start. To determine if the fuel supply is not correct, the following steps are carried out sequentially:
- remove the spark plug;
- pour 2 cc of gasoline into the spark plug hole with a syringe;
- Reattach the ignition device and replace the spark plug and put on the ignition cap of the high-voltage cable;
- the lever is moved to the position of hot start;
- pull the starter grip a few times.
If the tool starts and immediately stops, then the fuel line is tested further. Check the gasoline filter, the splash from the engine crankcase, the integrity of the partition in the pump when unscrewing the cap.
Crankshaft bearings breakage
If the bearings are defective, a slight backlash is felt. To check for cracks, turn the STIHL MS 180 handwheel from side to side. The movement indicates that the handwheel is shifted toward the electrodes by its own magnets, resulting in no spark. To remove the mechanism remove the cutter, remove the filter and clutch cover. To secure the crankshaft, remove the recoil starter cover and tighten the two bolts.
Unscrew the clutch with a wrench in a clockwise direction. Remove the drum with sprocket, replace the old clutch and screw it all the way in. The crankshaft is blocked to prevent breaking the starter motor. Reassemble in reverse order. To tighten, the brake handle is tilted forward, the tool is started, then removed from the brake.
Rarely spotted are defective bearings (the diameter of the holes in the cage is enlarged). To determine this, they are disassembled and measured with a micrometer. Broken bearings are indicated by regular knocking. In this case, urgent repairs are necessary because. к. If the integrity of the crankshaft is compromised, the piston group and cylinder will fail.
Fills the spark plug
In this case, the spark is unable to ignite the fuel, which in large quantities goes into the furnace to burn the combustible mixture. If the spark plug pours, the carburetor is defective or the engine does not start correctly when cold. Performs engine purge, procedure performed with ignition off and away from open flame. To ensure the ignition of fuel at the time of start-up, clean the mechanism:
- Unscrew the spark plug, wipe it dry and dry it for half an hour;
- Remove heavy soot deposits with a scraper;
- regulate the clearance between the contacts;
- the tool is turned upside down and the gasoline is drained;
- in this position, jerk the starter a few times (to remove fuel residues);
- Reassemble in reverse order.
Few tips for maintenance
Careful observance of the operating and maintenance instructions is a guarantee of long and trouble-free operation of the tool. it is necessary to take into account that every part of chain saw has its own service life and that’s why they must be timely replaced.
The following are some rules for working with the tool:
- Before each start-up, check that the chain is in good condition and has sufficient tension.
- Use only a well-sharpened chain for work.
- Clean sawdust from all parts after use.
- Turn guide bar for even wear. Lubricate the chain sprocket at the same time.
- Drain fuel and oil if stored for long periods.
Keep the chain and tire disassembled, as they form an electrochemical pair, and this leads to the formation of rust.
Not only tools of budget class, but also quite prestigious models of famous manufacturers are subject to spontaneous failures in case of improper use and maintenance. To keep your chainsaw in good working order, follow the recommendations of professionals.