Replacing the Fuel Hose On a Chinese Chainsaw

A chainsaw is a simple device that, with proper care, can last a long time. At the same time, the saw is a tool subject to various loads and, therefore, breakdowns still occur. You will learn about what caused the specific malfunction and how to fix it from this article.

Replacing the Fuel Hose On a Chinese Chainsaw

Essential skills and repair tools

Most of the malfunctions of chain gasoline saws can be eliminated with your own hands. True, this requires an understanding of the device of the chainsaw and how the nodes function among themselves. As for the tool, it is most often necessary:

  • screwdrivers (slotted and power);
  • combination wrench included in the kit or conventional wrenches with heads of various sizes.

Repair it yourself or give it to a service center

It should be understood that not every problem can be solved independently. Not every owner of a chainsaw has a compressometer or a special device at home that allows you to create a vacuum and the right pressure, for example, to check the crankcase for leaks. In this case, you just can’t do without turning to specialized specialists.

Troubleshooting algorithm

If you are sure that you can assemble the chainsaw after disassembly, then a screwdriver is in your hands. To establish the true cause of the malfunction, it is necessary to analyze the condition and behavior of the saw.


In most cases, the engine encounters the following problems:

  • the engine stopped starting;
  • the engine starts, but stalls after a while;
  • the engine is not able to develop the necessary power;
  • the engine is extremely unstable.

How to check crankshaft oil seals

The presence of leakage of oil seals can be checked only by reaching the crankshaft, and carefully examining it for leaks. On how to do this correctly, you can find on the video:

How to check compression on a chainsaw

At a compression level below 8 atmospheres, the engine will not have enough power, which means that the chainsaw will not be able to fully function.

To measure compression, you must:

  1. Remove the protective cover and unscrew the spark plug.
  2. Insert the tip of the compressor into the hole where the candle should be.
  3. Using the starter cord, rotate the piston and remember the maximum reading of the measuring device.

How to put the piston on a chainsaw

Work on replacing the piston for most models of modern chainsaws is carried out according to the following algorithm:

  1. The top and side covers are removed.
  2. The candle is twisted.
  3. They are removed from the shock absorbers of the stopper and the handle is disconnected from the housing.
  4. The leading asterisk and starter acts in film.
  5. A piston stop is installed in the spark plug hole and the nut is fixed to fix the flywheel and the clutch.
  6. The flywheel, clutch, worm gear of the oil pump located immediately behind the clutch mechanism are removed.
  7. The screws securing the carburetor and air filter are untwisted, after which these components are removed together with the engine control lever.
  8. The ignition coil is removed, as well as the muffler.
  9. The saw is turned upside down and, having unscrewed the screws that secure it to the body, the engine is disconnected.
  10. The pan unwinds and the piston is removed.
  11. Since the piston is removed only together with the crankshaft, it is necessary to remove the snap rings to detach it.
  12. The old piston changes to a new one, but as carefully as possible. This is caused by the high fragility of the compression rings.
  13. The sump is put in place, and instead of the gasket, a sealant is used.

All subsequent actions are carried out according to the reverse of the disassembly algorithm.

Fuel system

Failures of the fuel system also quite often become the main reason that does not allow the chainsaw to work as efficiently as possible. First of all, it is necessary to check the quality of the fuel mixture.

Some owners prefer to use not the recommended brand of gasoline, but alcohol-containing solutions or add more oil than necessary.

Flowing gasoline from a chainsaw

If gasoline droplets periodically appear on the chainsaw body, the fuel tank must be checked for leaks. Over time, it may dry out. Or, the gasket is “numb” and it can no longer fulfill its direct function.

If there are full-fledged gasoline streams, then it is likely that you will have to change the bursting hose connecting the carburetor and the fuel tank.

Gasoline does not enter the chainsaw cylinder

There are several reasons why the fuel mixture ceased to enter the cylinder:

  • Air filter clogged.
  • The carb settings of the carburetor flew.
  • The carburetor membrane is no longer integral.
  • The channels through which gas is transported are clogged.

Chainsaw does not hold idle

In this case, you should start to look for a malfunction with the filter elements. For the most part, it is precisely because of the reduced throughput of the air and gas filters that the idle speed begins to “float”.

If everything is in order with the filters, then it is necessary to check the components of the gas pipeline system, and also make sure that there are no spontaneous changes in the carburetor settings.


A “rich” or “poor” fuel mixture will sooner or later cause a breakdown. Perhaps even expensive. To prevent this from happening, it will be useful to regularly check the filter for abrasions, as well as for a breakthrough of the filter cloth itself.

How to check the fuel filter and replace

To check the current state of the fuel filter, the following steps must be taken:

  1. Remove the fuel hose from the carburetor fitting and direct it into the working container.
  2. Click on the so-called “swap” several times.

If gasoline arrives unevenly and jerkily, then it’s time to put a new filter element. This is done quite simply:

  1. The fuel tank cap is unscrewed.
  2. Using tweezers or any other device, the filter itself is removed.
  3. Having disconnected the old filter, it is necessary to put a new one and lower it into the fuel tank.

How to clean the air filter

If enough air is not received, the fuel mixture becomes too enriched, which leads to a disruption in the normal operation of the engine. Regular purging of the air filter, and in especially neglected cases, washing in soapy water will prevent such problems.

Please note that rinsing in acetone, gasoline or other aggressive solutions is not allowed. This can lead to a violation of the integrity of the filter element.

Uncertain Category Failure

In some cases, owners of chainsaws have to solve more complex problems to fully restore the functionality of their cutting tool.

Chainsaw does not develop full power

In addition to the problems discussed above with a lack of gas or air entering the cylinder, the reason for the low power may be a clogged muffler.

If you do not periodically clean the muffler clogged with combustion products, then the problem of poor engine power may not be the only one.

Carburetor depressurization and nozzle blockage

Over time, the screws securing the carburetor cover may loosen or the gaskets become unusable. A clogged filter or an unqualified replacement may result in clogged nozzles. All this also negatively affects the operation of the chainsaw and shortens the life of the tool.

To prevent this, it is enough to periodically inspect the saw and, if necessary, evenly tighten the screws.

Chainsaw does not hold idle

It often happens when, after prolonged transportation and constant use, the chainsaw refuses to idle smoothly. This problem is usually resolved by adjusting the carburetor.

You can learn how to properly debug a carburetor from this video:

If the carburetor is set up like a clock, then you need to check:

  1. Fuel system. To start more logically with the fuel pump.
  2. Muffler. It is very likely that due to the abundance of soot accumulated, the engine cannot function normally.

Chainsaw loses power under load

If the saw power is lost somewhere during operation, then the problem should be sought in the following places:

  1. In the silencer. He, as you already understood, has the property of clogging.
  2. In a clogged fuel filter.
  3. In a poorly functioning fuel pump.

Failure of other systems

In some cases, users of chainsaws note other problems that do not significantly affect the operation of the tool.

Why is a chainsaw smoking

Most often, excess smoke appears when the oil is excessively added to the fuel mixture, which does not have time to completely burn out. You should also check if the carburetor settings have gone wrong.

Recoil when starting a chainsaw

For the most part, recoil at the time of starting signals the clamp of the decompressor. If the tool is not equipped with a decompressor, then most likely the ignition system has lost.

Failures of the Chinese chainsaw: a review of the popular and ways to solve them

The most popular faults in Chinese chainsaws include:

  1. Poor lubrication system. Clogged oil channels are cleaned, and if the oil pump fails, a replacement is necessary.
  2. The starter cable breaks.
  3. Damage to the plastic axis of the starter. To replace it, an ordinary metal bolt is suitable.

Video: Replacing the Fuel Hose On a Chinese Chainsaw

In the case of the slightest suspicion of incorrect operation of the chainsaw, it is worth immediately to make a complete diagnosis of the tool. Only with proper operation and timely maintenance can you count on the long term use of the chainsaw.

Tools, equipment and machinery
Recommendations for selection. Operation, repair and maintenance. Faults and solutions.

When assembling the Partner 352 chainsaw, can you put the old gaskets or is it necessary to have new ones?

In general, of course, it is recommended to put new ones. But again, depending on the gasket. If, say, on a large saw, the crankcase crankcase connector gasket is uniquely new, it should be installed. Under the cylinder (if there is one in the design). always new. It would be nice to have a new one under the thermal insulator, especially since they are almost always damaged. Under the carburetor, you can old if not deformed, or not torn. You can also use the old one under the muffler. it’s okay, even if it’s not dense, it will grow almost immediately.

Partner 371 chainsaw new, month of operation. Starts up with a half-turn, it works perfectly at idle, but if you give gas, it stalls. And sometimes it happens 2 tanks of gasoline will go away and work fine. Maybe someone had such a disaster, tell me what it can be and what to do?

I have it when there is less than half a tank of gasoline and a horizontal saw.

On the Partner 371 chainsaw, the 18 ″ tire, I wanted to put the 16 ″ tire. does it make sense, and how will this affect the saw? if you can make such a replacement, then which bus is better to put?

The advantages of such a replacement. The saw will be easier, more maneuverable. The center of gravity of the saw will shift slightly closer to the rear handle, it will be more convenient to saw. Running the end of the tire will also be more convenient. A shorter chain is cheaper and faster to sharpen. Minus. The cutting length may not be enough when sawing in cramped conditions, for example, when sawing sufficiently thick logs piled in a pile. First of all, it is necessary that the new tire would have the same shank as the old one. If you have an Oregon tire installed, then the marking should be knocked out not far from the shank. In the indicated article, the first two digits indicate the tire length in inches. It is enough to replace “18” with “16”. Example, 180SDEA is knocked out, so a 160SDEA bus is needed.

Tell me by the fuel filter, which in the tank, looked at it, did not see anything filtering, some kind of heavy ceramic flask. Maybe there’s no filter at all? Is carburetor difficult to disassemble?

There is a filter there (a bulb is a filter), Partner is still not one of the worst chainsaws. It is hardly necessary to disassemble the carburetor. the saw was new. Adjust and disassemble are two different things.

What is the oil consumption of the Partner 352 chainsaw? After two refueling, the gas tank saw a sagging chain. I unscrewed the oil cap, it’s empty there. poured another 150 ml. How to refuel?

Refuel in this order: Fill the oil tank first, and then refuel. In this case, if you forget to add the fuel mixture to the tank, then the saw just will not start or will die out shortly after starting. An empty oil tank will be detected only after overheating of the chain and tire. The oil consumption and the volume of the oil tank are calculated by the manufacturers so that after the fuel has been used up, there is still oil for lubrication, but there is never enough oil tank for two fuel tanks. If the oil consumption on the saw is within these limits, then everything is normal.

I have a Partner 371 chainsaw lately the filter mesh in the carburetor has been constantly polluted. where does the dirt come from?

There are two ways to contaminate the mesh: through the pulse channel (if the air filter does not hold well) and through the fuel line. If the old gasoline filter. replace, flush the gas tank and fuel line. And that should pass.

I am engaged in the repair of the fuel system of the Partner 352 chainsaw. Where, nevertheless, is the mixture prepared (air is mixed with fuel)? Right where is the throttle? What causes fuel to be injected through the valve nozzle toward the cylinder? What function does the jet do?

Right where the throttle is. The piston sucks in air. The mixture is sucked in and sprayed through the same air through the jet. The principle of operation of the jet pump. Or spray gun soon. Discharge of air in the carburetor causes the mixture to be injected. Because the piston when it goes up creates a vacuum. The jet plays the function of feeding the fuel mixture into the air. This is a very accurate part with a fixed diameter, designed for the correct ratio of the fuel mixture to air, turning it into a fuel-air mixture. The small hole at the bottom of the cylinder is the impulse channel. By discharging air, the piston forces the membrane to move, and thereby inject the fuel mixture from the tank. The primer should stand on the return hose, it pumps gasoline (fuel mixture) through the carburetor back into the tank, thereby facilitating starting. If there is no primer in the saw, then the diaphragm inside the carburetor pumps fuel from the tank into the carburetor. To start the engine without a primer requires a larger number of jerks.

There was an oddity in the work of the Partner 352 chainsaw. It starts without problems with a cold one, but while the idle speed is warming up, even the chain starts to run. Then, when the engine warms up, we do gasping and the idling is restored, the saw continues to work as usual. What is the reason? The carburetor is tuned, the heat in the street. I do not drink much, but often. It’s easy to get started on the hot, though sometimes with half gas. Tell me what and where to look?

So it should be, approximately. It starts cold, there the evaporation of gasoline is small and it seems to be lacking. When it warms up a little, evaporation increases and the engine begins to receive more gasoline vapors. But it could be the other way around. So much gasoline goes on the “suction” that the cold engine is not able to digest it and is gaining momentum gradually. Something has changed if it wasn’t before, but for now
fits into the norm. Perhaps you have a lot of oil sludge in the crankcase, if you are already very "short" work. Try to cut something very long and thick and longer at full throttle. Maybe "breaks" and will be as before. Although it’s normal now.

Saw Partner 371, at idle it works normally, and gas can be given only if the damper is half closed. When the damper is fully open, when the gas button is pressed, it starts to stall. How to fix?

Lack of gasoline. There may be several reasons: the carburetor requires adjustment, the fuel filter is dirty or the carburetor is clogged. There may also be a slight air leak. But I advise you to start with checking the fuel filter and adjusting the carburetor.

Tell me on the Partner 371 chainsaw. should gasoline not enter the primer? I tried to clean the carburetor, nothing has changed. Could not remove the membrane.

If you press the primer, of course, gasoline should flow. If not, check the carburetor, filter, and fuel lines. Somewhere clogged. over, gasoline in the fuel line was under pressure. The membrane is removable, if not removed, moisten a little with a cleaner or gasoline. Apparently, I’m afraid that your knowledge is not enough. It is necessary to remove the covers, membranes, gaskets, as well as the filter mesh from both sides, unscrew the nozzles, and check the functioning of the needle valve. Well, gasoline itself cannot be cleaned properly.

Tell me, is the carburetor at the Partner 352 saw subject to adjustment?

The carburetor is adjustable, for starters (if necessary) the base: L. 2, N. 1.5. And this Partner has analogues in design and in spare parts.

The Partner 352 chainsaw, in general, had to re-adjust the carburetor, it starts up shorter, but just press the gas, it either stalls immediately or accelerates and stalls, everything has been twisted and nothing comes out. What to do?

There they have a disease. the carburetor strut is unscrewed, and if the saw has worked a lot, the gland may be damaged. There is such a symptom when the carburetor does not respond to the adjustment.

I have a Partner 352 chainsaw 2007 edition During this time, the saw chain became unusable. There is no marking on it, what kind of chain is not clear. Which one should I buy a new one for a saw? Tire 41 cm. 16 ″.

0.375 ″ is the same as 3/8 ″. You need a 3/8 ″ x 1.3 mm chain with 56 links. And this type of Oregon chains is not necessary at all, it is even possible and not Oregon at all.

The tire Reser to the chainsaw The partner got up, all the necessary holes coincided, the chain bought Shtilevskaya 3 / 8.1.6. 64. Sawed today thick boards and along and across. Everything works, sometimes it seems that the saw is hard to drag this chain. A Oregon chain 3/8, 1.5. 64. is it easier to work or is the saw also thoroughly loaded?

In this case, it will no longer depend on the manufacturer and not on the standard of the guide links (1.6 mm Shtilevsky standard, and 1.5 mm. the rest of the brands), but on the type of cutting teeth on a particular chain model, the angle of sharpening and the sharpness of the cutting edges on the teeth. Acuity will be especially important in longitudinal sawing, where the chain “sits down” much faster and it often happens that across it is still quite tolerably sawing, but already refuses along.

In this article, we will explain why breakdowns of various chainsaw components occur and how to eliminate them. If your saw has stopped starting up or is not working as it should. do not rush to send it to the service. A simple repair may be enough to bring the tool back to life.

Most chainsaw breakdowns are very trivial. The imaginary feeling of complexity of the design disappears after the first complete disassembly, because the principle of operation of all components of the mechanism is extremely simple and intuitive. Therefore, stock up with wrenches and heads from 6 to 22 mm in size, screwdrivers for a slot, a cross, hex wrenches and a lock ring puller. Drain the oil and fuel before disassembling, spread a clean rag under the saw.

Description of construction and disassembly of the saw

As a rule, it is not necessary to completely disassemble the saw when repairing breakdowns. Work is underway on one or more nodes of the chainsaw:

  1. Chain, tire, clutch and inertia brake. Access can be obtained by removing the side cover on the right side, loosening the tire nuts and the chain tension bolt. The brake is located in the cavity of the cover.
  2. The clutch is located on the motor shaft to the left of the saw bar.
  3. Chain lubrication system. The oil pump is located under the clutch basket or is integrated into the crankcase.
  4. The muffler is located in the front of the chainsaw, fixed with two nuts.
  5. The air filter is located at the top of the chainsaw immediately under the cover.
  6. The carburetor is located directly under the air filter, connection to the engine cylinder can be done through an adapter.
  7. The ignition system is located under the left side cover, in the cavity of which there is a manual starter.
  8. Engine cylinder. It is attached to the crankcase with four screws on the underside.

Solving problems with the fuel system and fuel preparation

Violation of the dosage of oil in gasoline leads to a drop in power, active clogging of the cylinder, and then to failure of the piston. The first signs of improper refueling are increased exhaust smoke or a dry, cracking sound when the engine is running. The chainsaw is refueled with A-92 gasoline with the addition of the recommended 2T standard oil (blue) in a ratio of 50: 1.

The correct preparation of the fuel-air mixture depends on the carburetor setting, which affects both productivity and service life. The poor mixture does not allow the motor to develop power, when the load saw it was "suffocating", the engine might not start at all. Too rich a mixture also causes start-up problems, it covers the cylinder and spark plug electrodes abundantly with carbon, and fuel consumption is increased. There are three screws for setting on the carburetor:

The carburetor can be correctly configured, but clogged, in this case it is completely disassembled and washed with gasoline, and it is mandatory to replace the fuel filter, which is located inside the tank.

Silencer and air filter

Clogged silencer or air filter explain the lack of developed power of the engine, even without load it is very poorly gaining momentum. The muffler is soaked overnight in a solution of laundry soap and dishwashing detergent, washed well and dried. Silencer must not be cleaned with metal tools. The foam filter must either be flushed or replaced with a new one.

Typical piston malfunctions and their elimination

The main difficulty in removing the engine cylinder is to twist the ignition flywheel and clutch. To do this, you need to lock the piston: when moving it to the top dead center, introduce a rope with a dozen knots tied to it through the candle hole. The clutch has a left-hand thread and is rotated either by a hexagonal protrusion or by two grooves into which a slightly bored key is inserted at 17. The flywheel is fastened with a regular nut with a right-hand thread. When it is twisted, you need to lightly knock on the end through a wooden block.

Checking the condition of the cylinder-piston group must be carried out at each disassembly of the saw. The presence of scoring and scratches on the surface of the piston and cylinder is a consequence of improper refueling of the saw and a signal for replacement. If seizures are present only on the exhaust side, then the saw has repeatedly overheated. It is also necessary to check for radial and inclined play in the bearings of the connecting rod and crankshaft.

The cylinder can be replaced separately from the connecting rod, for this you need to remove the retaining ring and knock out a finger. To replace the bearing of the connecting rod head, the latter is dismantled by unscrewing two bolts. The rings on the cylinder change either after the motor resource has expired, or in the presence of visible deformation. Install the rings with the marking up. If the depth of the second groove is greater than the first, an annular expander is first inserted into it.

Tire, chain, chain brake and lubrication

After two chains are worn out, the drive sprocket needs to be replaced. The use of a worn sprocket affects the resource of the crankshaft bearings and is expressed in strong vibration, the chain also deteriorates faster. It is recommended to turn the tire over as the working part wears out.

The cause of poor brake performance may be excessive contamination of the space under the cover or general wear of the belt spring. Also, there are frequent cases when, when the brake is applied, the clutch is destroyed from overheating and the entire assembly needs to be changed.

Lack of lubrication on the chain can cause clogging of the oil pump channels; it must be washed in gasoline and cleaned with fishing line. If the oil flows too much during operation, tighten the oil pump adjustment screw slightly. It happens that during operation the chain is dry, and with a simple oil oozes under the clutch. This means that the oil hose is not tight and needs to be replaced.

Ignition system failures

Often the saw fails to start due to the lack of spark on the candle. To make sure, turn out the candle, put on a cap of wire on it, press it against the cylinder body and work as a starter.

A spark may be absent for a number of reasons. First of all, check the connection pins of the wires coming from the ignition module, strip them. Also inspect the flywheel for signs of damage to the magnetic circuit and whether there is a gap between the module and the flywheel. If the breakdown persists, replace the ignition module with a new one.

The cause of the lack of ignition may be the candle itself, check its suitability with a control. The electrodes must be cleaned with sandpaper and wiped with a rag in gasoline.

Saw Guidelines

To break the saw less often, follow these tips:

  1. Use only the recommended oil and dosage.
  2. Sharpen or change the chain in time.
  3. Perform complete disassembly and cleaning of the saw once a year.
  4. Do not overheat the engine with prolonged load.
  5. Change the fuel filter every 70–80 liters of gasoline spent.

With due regard, your saw will last much longer.