How to Adjust the Carburetor on a Partner 350 Chainsaw

Adjusting the Carburetor of a Partner 371 Chainsaw with Your Own Hands

The tool is designed for small jobs directly related to clearing areas of old trees, winter stocking of firewood, longitudinal, cross and diagonal sawing of wooden and chipboard building materials.

Although it is a domestic class saw, it has some features that are common to semi-professional class. The basic version is:

  • Two-stage air-cleaning circuit;
  • the presence of the quick start system;
  • automatic lubrication of the saw chain;
  • Inertia brake emergency stop.

The Partner 351 chainsaw has a serious flaw in its power system that causes it to malfunction. This defect lies in the adapter installed between the engine and the carburetor (we have already talked about this above, there on the photo we marked the location of the adapter).

Over time, play appears in the connection and the chainsaw becomes air sucked. This malfunction appears as a failure at start-up (the saw simply does not start), or during operation in the form of unstable RPM, they spontaneously rise and fall.

Repairing the carburetor on a Partner 340 chainsaw

A common problem with the carburetor of the Partner 340 chainsaw is fuel leakage (loss of tightness). First you need to check the integrity of the gasket between the carburetor and the crankcase. If there is nothing wrong with it, it is the carburetor leaks.

You need a pressure gauge to check for leaks. The gauge inlet is put on the fuel hose. Then a certain amount of air is pumped into the carburettor with a bulb. The reading should be at least 0.4 bar. Check the pressure again after a short time. If it has dropped, the carburetor needs repair. The following may be the culprit:

There is a diaphragm chamber cover on the side of the carburetor on the Partner 340 chain saw. Through a hole in it, dirt gets inside the carburettor. When it accumulates, the diaphragm rises and compresses the needle valve lever. As a result, the lever does not completely block the fuel channel, resulting in over-enrichment of the mixture.

This cap must be frequently removed and cleaned of accumulated dirt. its design allows to do it quickly and easily (you need to unscrew four screws on the side of the carburetor).

All the problems mentioned above usually have 2 main causes: overheating of the engine (poor mixture) and a clogged carburetor (insufficient fuel filtration). Both problems can be solved by correct adjustment and timely cleaning of carburetor, air filter. Don’t forget the gasoline filter element.

Particular attention during cleaning should be paid to the mesh, the slightest of its clogging leads to unstable operation of the chainsaw.

Parts that fail can be replaced with the appropriate repair kit.

Adjusting the carburetor

The Partner 340 features an adjustable Walbro diaphragm carburetor.

In order to make the adjustment yourself, you need to have a special screwdriver and tachometer (device for checking the engine speed).

Screws for adjustment have a standard designation. Screw (T). regulates the idle speed. (L). adjusts the carburetor for proper fuel mixture at low and medium rpm. (H). adjusts power and high RPM.

If you have no idea how and why the adjustment should be carried out, you are advised to contact the Service Center. Otherwise you risk damaging the engine by setting the wrong settings.

There are two steps to adjust the carburetor on the Partner 340s. The first stage of the adjustment procedure is carried out when the machine is stopped. to do so turn the screws (L) and (H) 1.5. 2 turns away from their fully tightened position. Screw (T) half turn.

In the second stage you start up the chainsaw and let it run for a few minutes to warm up. Next, use the tachometer to find the position of the screw (L) in which the engine gives the maximum idle RPM and unscrew the screw by ¼ of a turn. Reset the idle speed with the screw (T). The normal setting is 800 rpm and this can be checked with a tachometer. If you have no tachometer, set the RPM so that the chain does not spin when idle, but the chain saw still keeps working steadily.

Screw (H) is used to set the maximum rpm. For the Partner p340s this value is 13,000.

Adjusting the carburetor on a Partner 350 with your hands

All carburetors on Partner 350 chain saws are factory-tuned on special stands. The adjustment screws are securely fastened with springs and only rarely unscrew them when the chain saw is in use. But adjusting the carburetor yourself is sometimes necessary, even if not often.

For example, if the piston group is badly worn, you could compensate for the loss of compression and power by increasing the fuel rate. This will result in excessive fuel consumption, and the piston group will still have to be replaced. But the chainsaw can still be running for a while.

In some cases adjustments are required after the engine has run-in and when switching to a different brand of gasoline.

The carburetor needs adjustment:

  • Chainsaw at idle speed stalls (low rpm) or rpm is too high, chain is spinning. Need to adjust idle speed with screw T.
  • The engine doesn’t rev, “collapses” when you push the gas pedal pedal. Fuel shortage, mixture too weak (less petrol. more air). Screws L and H need adjustment.

Sometimes these problems occur for other reasons:

Check that there is nothing wrong with it before adjusting the carburettor.

This is what a clogged filter looks like with dust and swarf

Needed tools

You will need a Phillips screwdriver for the T screw. H and L screws do not have screwdriver slots. They have a knurled head for the socket wrench. With the cap off, you can twist them with your fingers, a wrench, or a pair of pliers.

The heads of the adjusting screws on your Partner 350 chain saw might have different slots. There are flathead screwdriver options on all three screws as well.

To control the amount of idle and maximum rpm you can use the electronic tachometer. If it is not available, the adjustment is done by ear, by the real operation of the engine.

Adjustment algorithm for the carburetor

There are holes in the cover of the Partner 350 chain saw to make adjustments. In practice, it is difficult to adjust the carburettor through them. It’s easier to remove the cover and see the screw heads.

Before beginning adjustment the engine should be warmed up for about 6-10 minutes.

Adjusting the idle speed

The chain saw is started. Turn the screw T in small increments of 1/3-1/4 of a turn in the desired direction, achieving optimum RPM, when the engine does not stall, and the chain does not rotate. If the chain is cranking, turn down the idle speed. If the exhaust is extremely rare and the engine stalls, revs up. The tachometer is practically unnecessary in this case. But if it is used, with proper adjustment it will show 2500. 3300 rpm.

Features of the device

Before starting the process, it is important to run in time to calibrate the factory device.

The main components of the carburetor are:

  • Main part. It is a special tube designed to let air through. There is a damper that can be repositioned.
  • Diffuser. This is the narrow area of the tube. It is necessary for speeding up the mass flow of the air type.
  • Fuel supply conduit. The fuel is stored in the float chamber. From there it flows to the nozzle and then to the sprayer.
  • Chamber. Similar in shape to a tank. Maintains the fuel supply in the right volume.

For saw adjustment and repair we need tools. L, H, T screws, scheme.

Device Features

It is important to run in the factory equipment in good time before starting the process, correct timing.

The main components of the carburetor are:

  • Main part. It is a special tube, designed for the passage of air. There is a damper with the possibility of changing its location.
  • Diffuser. It’s a narrow area of the tube. It is needed to speed up the mass flow of the air type.
  • Fuel supply conduit. Fuel is stored in the float chamber. From there it goes to the nozzle and then to the atomizer.
  • The chamber. Shaped like a container. Keeps the right amount of fuel.

To adjust and repair the saw we will need tools. L, H, T screws, diagram.

Repairing a Partner 350 Carburetor with Your Hands

Without certain skills and special tools, such as pins of different sizes or an ultrasonic bath, repair of the carburetor Partner 350 is reduced to replacement of the repair kit.

WT-891 carburetor repair kit may consist only of gaskets and diaphragms, or may include a full set of all replacement elements. This:

To replace a complete set, without experience and tools is impossible, so when repairing by yourself, it is better to choose the first option of the repair kit. If after replacing the repair kit and making carburetor adjustments your Partner 350 chain saw is showing signs of failure, it may be best to call in a specialist to repair the problem.

Features of the carburetor, pros and cons

The carburetor of the chainsaw Partner 350 has a typical (classic) design, identical to almost all modern carburetors for chainsaws of similar power. It is sufficiently reliable and provides optimal engine performance in all conditions and economical fuel consumption. Some unique features that radically distinguish it from other carburetors does not have.

Pros and cons do not depend on the design of the carburetor itself, but on the manufacturer. Original Walbro high quality carburetors. Carburetors from unknown manufacturers leave much to be desired, with them as luck.

Mechanical causes of failure

The need to adjust the carburetor of the Partner-350 chainsaw can also be caused by mechanical failures. Strong vibrations can damage the nose guard for example. As a result, the rigid fixation of the bolts available in the carburetor is loosened.

Piston wear and tear is another possible cause. In such a case, the carburetor adjustment allows you to use the unit for a while, but you need to replace the worn part to correct the problem. Another reason could be a clog caused by the use of low-quality fuel. Scale build up and filter damage could be the culprit. To fix the problem, the carburetor needs to be disassembled, flushed well and then adjusted.

Design features of the Partner 350 chain saw

Reliable and easy to use saw this model has a gasoline engine with 1300 watts of power. It has an easy start-up, which is made possible by a professional fuel pump and an electronic ignition system.

The chainsaw is equipped with a safety system that automatically activates the twin inertia chain brake. Chain lubrication is also automatic. Changing the chain tension on this machine is very easy with just two wrenches.

The chainsaw is equipped with a fuel primer so it can be started without problems in all seasons. The tool is fitted with a starter drum with a special impeller that cleans debris.

CCS filter is able to trap all residual particles. In addition, this system allows the air filter to be used for a longer period of time, saving fuel.

equipped with a chrome coating on the cylinder walls of the piston unit, which considerably increases the service life of the tool.

Diagnosing the Partner 350 chainsaw

Correct determination of the fault is already more than half of the repair. For malfunctions related to the saw not starting, the essence of diagnosis is to check the spark and the presence of fuel in the cylinder, t. к. There is either nothing to burn in the chainsaw or nothing to ignite.

spark check

To check the spark it is necessary to unscrew the spark plug, put it in the cap of the high-voltage wire and put it to the cylinder (there should be a mass on the spark plug). Next, pull the starter several times, while looking carefully at the spark plug. No spark if your Partner 350 chainsaw has malfunctions such as:

  • A defective spark plug (can only be fixed by replacing it with a known good one);
  • breakage of wires in the system;
  • Faulty ignition switch;
  • defective ignition coil;
  • There is no clearance between the coil and the flywheel;
  • Key breakage between crankshaft and flywheel.

Checking for fuel

The first sign that the cylinder is not getting fuel is a dry spark plug. If you notice a dry spark plug, the next thing you need to do to pinpoint the problem is to try and start the Partner 350 chain saw by pouring under 5 ml of gasoline into the cylinder through the spark plug hole. If the chainsaw will not start after that, it most likely has no or insufficient compression to start the engine. Causes:

If after pouring gasoline under the plug the saw starts, the problem is in the carburetor or fuel line of the Partner 350. You need to do a full diagnostic of the fuel system.

Diagnose Bearings

During the chainsaw diagnostics it is necessary to check the bearings of the crankshaft for clearance. To do this, jiggle the flywheel up and down. If there is play, you need to replace the bearings.

Also do not forget to check the backlash of the crankshaft connecting rod. To do this, lock the piston in its highest position and rock the flywheel back and forth a little at a time, simulating natural movement. If there is play, the Partner 350 crankshaft must be replaced.

Features of the carburetor, pros and cons

The carburetor on the Partner 350 chain saw has a typical (classic) design, identical to almost all modern carburetors for chainsaws with similar power. It is reliable enough, quite provides optimal engine performance in all modes and economical fuel consumption. It does not have any unique features that radically distinguish it from other carburetors.

The pros and cons do not depend on the design of the carburetor, but on the manufacturer. The original Walbro carburetors are of high quality. Carburetors from unknown producers leave much to be desired, with them it is a matter of luck.

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Repair of the carburetor chainsaw Partner 350 with their own hands

The carburetor on the Partner 350 chain saw does not suffer heavy mechanical or thermal loads during operation, unlike, for example, the piston system. So in theory, there is nothing to break. In practice after many years of operation the gaskets often get depressurized and the elastic diaphragm fails. Over time it can become tough.

Breakdowns of counterfeit carburetors are unpredictable. Anything can break in them at any time. flap axles, needle valve, pump, diffuser, etc.д.

In addition to malfunctions, the carburetor on a Partner 350 chain saw can fail due to dirt. To repair and clean a carburetor, the carburetor is removed and disassembled.

It is worth noting that the gas pedal pump of the carburetor Partner 350 is its weak point.

How to remove and disassemble: step by step algorithm

Before removing the carburetor on your Partner 350 chain saw and the area around it should be brushed to keep dirt out of the engine. After that, it is removed:

  • Air filter.
  • Fuel hose.
  • Throttle pull.
  • Then the screws that secure the carburetor to the engine housing are unscrewed.

After removing, the carburetor is placed on a clean surface and the cover screws on the housing are loosened. Remove cover and gasket. Parts and fasteners are laid out one after the other. Slowly perform the disassembly, making sure you know which part was removed from where. It is critical that you do not mix up the H and L screws when reassembling. They are the same shape, but different lengths.

After all the cleaning steps are complete, the Partner 350 carburetor is ready for cleaning.

This is what a half-assembled carburetor looks like

Cleaning the carburetor: tips on how to clean it correctly

Whether or not the carburetor is clean is usually determined immediately, visually.

The smallest holes. the jets, diffusers, passages and fuel channels. are the first to get dirty. There may be a dirty sludge in the chambers. The disassembled carburetor body and parts are washed in a bath of gasoline or kerosene. Then blow out the ducts and holes with a car pump or air compressor. It is best to use a special nozzle with a thin channel on the end. Flush again.

During assembly if necessary replace the gaskets and the diaphragm with a new one from the repair kit.

To clean the carburetor, always clean the hole in the cover where the diaphragm is located. Marked in the photo with a red square

Repair kits: what they include and where to buy them

The service kits come with two kits.

The first includes gaskets and diaphragm, i.e. non-metallic parts. The second additionally includes a cross with a needle valve.

Kits cost about 300 to 370 and are available at specialty stores and on many online marketplaces.

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Independent adjustment of the carburetor Partner 350

Before you start adjusting your Partner 350 chain saw you need to keep the carburetor area free of dirt and dust.

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Assembly of the carburetor

After deciding to adjust your Partner 350 chainsaw, the first thing to do is to examine the design features of its parts. The most important part of the system is the nozzle, which acts as a restrictor to increase the rate of oxygen supply. The diffuser is located right next to the fuel inlet. The flow of oxygen is regulated by a pipe with a cross-sectional flap in the carburettor. Fuel delivery is by means of a needle nozzle. The carburetor is also designed with a float chamber to regulate the flow of fuel into the channel.

Owners of the Partner 350 gasoline chainsaw may find it necessary to adjust the carburetor while using this equipment. In order to carry out this procedure properly, great attention should be paid to familiarizing yourself with how this technical element functions. As a result of atomization of fuel in the diffuser by a jet of air the mixture is formed, which is pumped into the cylinder. The higher the amount of fuel, the higher the engine speed. Functioning of the carburetor in the described model of the equipment occurs in accordance with the scheme described above. Other models use the same scheme.

Adjustment of ignition

Owners of the gasoline saw “Partner-350″ have to adjust the ignition quite often. At the first start-up it is necessary to check the idle run. To do this, turn clockwise the screw that controls the idle speed. Once it has caught on, you should turn it four and a half turns in the opposite direction. If after performing these manipulations the engine operates without rotating the chain, you can conclude that there are no problems. Otherwise, you need to seek help from a service center, because using a chainsaw in this condition can be dangerous.

After the end of warranty service, the owner of the tool with skills in repairing appliances is available to correct the error.

First you need to learn the methods of. Experienced craftsmen believe that the repair of the engine gear 350 begins with a proper diagnosis with your hands. To determine the nature of the repair, you must:

  • Check the ignition system;
  • Carry out diagnostics of the carburetor;
  • Fuel efficiency;
  • Clean the muffler;
  • determine the operation of the piston system;
  • Check the chain lubrication;
  • Determine if your chainsaw has worn components and replacement parts.

Difficult problems need to be solved with consultants.

If the engine does not start, first check that the spark plugs are working properly. They should be dry and have a contact gap of 0.5-0.65 mm. Depending on the condition of the deployed spark plug, indications of fuel system and equipment operation failures may be identified.

Check the use of the spark plug that connects through the cap to the starter and place it on the cylinder housing.

The spark plug is fine if it gives body sparks when the starter is started. If there is no spark, this wire is faulty if the spark plug is waterlogged or its source is working.

Many carburetors can cause carburetor defects. But first you need to adjust the Engine 350 carburetor as shown on the

Read the same: choose a saw blade in a shop

Carburetor repair can temporarily extend engine run time.

The carburetor start holes may be clogged with poor fuel quality or a loose air filter. When removing the unit, all parts need to be flushed and blasted.

Repair and adjustment of the carburetor, as the most responsible unit, is best entrusted to a master.