Partner 350 saw carburetor adjustment

Repair Partner 350 carburetor with your own hands

Without certain skills and special tools, such as pins of various sizes or an ultrasonic bath, the repair of the carburetor Partner 350 comes down to replacing the repair kit.

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

It is impossible to replace the complete set without experience and tools, so when repairing on your own, it is better to choose the first option of the repair kit. If after replacing the repair kit and adjusting the carburetor, the Partner 350 chain saw shows signs of malfunction, it is better to contact the professionals to solve the problem.

ЗАМЕНА ПОРШНЕВОЙ ГРУППЫ НА ” PARTNER 350 ” \\\ ремонт бензопилы партнёр 350

Partner 350 chain saws use Japanese Walbro carburetors, the world’s largest maker of fuel components for gasoline-powered machines.

This is a specialized company that is constantly working to improve the design and quality of its products and values its reputation.

On the body of the carburetor from this company there is a Walbro inscription cast in large letters, and there is also a product number. If it does not say so, that means that your Partner 350 chain saw is equipped with exactly the same carburetor but from a different, lesser-known make. In Russia, you can find Partner 350 chain saws both with Walbro carburetors, and with unmarked products. They are identical in design and operating parameters.

Principle of operation and structure of the Partner 350 carburetor

The carburetor draws fuel from the gas tank, atomizes it in the nozzle-diffuser, and delivers the fuel-air mixture into the combustion chamber.

The fuel supply from the tank to the carburetor’s storage tank is metered by a diaphragm that opens and closes the needle valve. Calibrated jets and adjusting screws control fuel flow from the carburetor to the combustion chamber.

The amount of fuel-air mixture entering the combustion chamber determines the engine speed. This amount is adjusted during operation, by the throttle valve, which opens when the throttle grip is pressed, and vice versa.

Air damper controls airflow from the air filter. It is closed during a cold start, which makes it easier to start the engine. opens when the throttle trigger is pulled.

There is an idle mode, when a minimum amount of fuel mixture enters the combustion chamber without pushing the throttle knob.

For starting a cold engine, the carburetor is equipped with a manual primer pump (suction). Basic carburetor assemblies:

  • body, it contains the storage tank, channels for the passage of fuel, air and all the parts;
  • throttle and air valves;
  • elastic diaphragm;
  • cross with a needle valve;
  • jokers with a calibrated bore;
  • Diffuser, fuel spray nozzle;
  • Three adjusting screws T, H and L.

partner, carburetor, adjustment

This is what the original carburetor looks like removed from a Partner 350 chainsaw The screwdriver indicates the nozzle valve

Partner P 842 chainsaw. model features

This tool is equipped with a reliable hand starter and an effective forced-air system. Capacious fuel tanks reduce the number of refills during operation.

Features of this Partner model include:

  • The capacity of the original engine is 2.2 liters. с.;
  • Fuel mixture reservoir. 340 ml;
  • The possible length of the bar used for work is 35-40 cm;
  • Standard chain pitch is 3/8″;
  • Weight incl. tool set: 5.7 kg.

The chainsaw is equipped with a reliable inertia brake that is activated immediately if the chain hits a nail or other hard object.

See also  How to remove the carburetor on a Husqvarna 236

Adjusting the carburetor on a Partner 350 chainsaw with your hands

All carburetors on Partner 350 chain saws are factory-tuned on special stands. The adjusting screws are securely fastened with springs and are rarely unscrewed when the chain saw is in use. But the adjustment of the carburetor by your own efforts is sometimes required, although infrequently.

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

In some cases, the adjustment is required after the running-in of the engine and when switching to a different brand of gasoline.

Signs that the carburetor needs adjustment:

  • The chain saw does not idle (low rpm) or rpm is too high and the chain comes off. Need to adjust the idle speed with the T screw.
  • Engine doesn’t rev up when you squeeze the accelerator pedal. Fuel shortage, mixture too lean (too little gasoline, too much air). Requires adjustment with L and H screws.

Sometimes these problems can occur for other reasons:

You need to make sure there’s no problem with it and only then adjust carburetor.

This is how the filter looks clogged with dust and sawdust

Tools Required

Need a Phillips head screwdriver for screw T. H and L screws do not have screwdriver slots. They have a knurled head for a socket wrench. With the cap off, they can be turned with your fingers, wrench, or pliers.

There may be a different groove on the heads of the adjusting screws on other Partner 350 chain saws. There are also flat screwdriver options on all three screws.

An electronic tachometer can be used to check the idle and maximum RPM. If it is absent, the adjustment is done by ear, by the real work of the engine.

Algorithm of carburetor adjustment

Your Partner 350 chain saw has adjustment holes in the cover. In practice, it is difficult to adjust the carburetor. It is easier to remove the cover to see the heads of the screws.

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

Idle speed adjustment

Start the chain saw. Turn the screw T in small increments of 1/3-1/4 turn in the desired direction, achieving the optimum speed when the engine does not stall and the chain does not rotate. If the chain scrolls, decrease idle speed. If the exhaust is extremely rare and the engine stalls, increase the RPM. The tachometer is almost unnecessary in this case. But if you use it, with proper adjustment it will show 2500. 3300 rpm.

Adjusting the RPM and RPM

Screw H regulates the petrol flow (amount). The L screw controls the amount of air and this determines the petrol and air proportions in the fuel-air mix (quality).

If too much gasoline is fed during adjustment, the spark plug will flood and go out.

PARTNER 350″ Правильная регулировка карбюратора.

Unburned fuel in the lack of oxygen will fly into the exhaust system. in this case the engine is smoking and consuming extra fuel.

That is why the H screw is adjusted together with the L screw. by increasing the fuel supply, the air supply is also increased.

There are two screws to adjust the carburetor on the Partner 350 chain saw: L, H

Adjustment is best made with the engine running, by rotating the H and L screws 1/4 turn and seeing how the engine reacts when the accelerator pedal is depressed. If sags become less, turn off the screws by another 1/4 turn. If the engine became worse, the settings are returned to their original position and carried out the adjustment in the other direction.

In any adjustment, especially if the screws had to be turned in or out completely for some reason, it is necessary to memorize or record the number of revolutions made. If the engine fails to start, it is possible to return to the factory settings.

Factory carburetor settings

Despite the standards, each carburetor and chainsaw has its own individual characteristics. Factory adjustment by hardware methods on equipped stands allows you to adjust the carburetor to the most optimal mode:

  • The engine runs steadily at idle speed, the chain does not crank.
  • The proportions of gasoline and air in the carburetor are optimal, and the gasoline burns off completely.
  • When you press the throttle knob, the engine immediately develops maximum revolutions, and there is no overspending of fuel.
See also  How to install the blade in a hand jigsaw

That is why, when adjusting independently, the factory parameters should be considered basic.

It is not completely clear from the video why it was necessary to tighten the screws to the end, and not to start the adjustment from the factory position of the screws. But the finale is positive, the adjuster did a pretty good job tuning the carburetor.

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 by springs and rarely unscrew them when the chain saw is in use. But adjusting your carburetor yourself is sometimes necessary, but infrequently.

For example, with heavy wear of the piston group, the loss of compression and power can be compensated by increasing the fuel supply. It will lead to overfueling, and the piston group still has to be replaced. The chainsaw can still be running for a while.

In some cases, adjustment is needed after the engine has run-in or when switching to a different gasoline brand.

Partner P350 carburetor adjustment

Signs that the carburetor needs to be adjusted:

  • Chainsaw stalls at idle (low rpm) or rpm is too high, chain is cranking. Requires idle speed adjustment with T screw.
  • Engine won’t rev, “fails” when throttle trigger is depressed. The engine doesn’t have enough fuel or the mixture is too weak (too little gasoline, too much air). L and H screws need adjustment.

Sometimes these problems occur for other reasons:

It is necessary to make sure that there is no problem with it, and only then proceed to the adjustment of the carburetor.

This is what a clogged dust and sawdust filter looks like

Needed tools

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

The heads of the adjusting screws on your Partner 350 chain saw may have different slots. There are options and under the flat screwdriver on all three screws.

An electronic tachometer can be used to control the amount of idle and maximum revolutions. If it is absent, the adjustment is done by ear, by the real operation of the engine.

Algorithm of carburetor adjustment

The cover of the Partner 350 chain saw has holes for adjustment. In practice, it is difficult to adjust the carburetor through them. It is easier to remove the cover, then you can see the screw heads.

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

Adjusting 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 starts, decrease the engine rpm. If the exhaust is extremely rare and the engine stalls, revs up. The tachometer is almost useless in this case. But if you use it, if it is adjusted correctly, it will show 2,500 to 3,300 rpm.

Medium and high revs adjustment

Screw H controls the petrol flow (amount). Screw L adjusts the amount of air and this determines the proportions of petrol and air in the fuel-air mixture (quality).

If in the process of adjustment, too much gasoline will be fed, the spark plug will flood and the spark will disappear.

Unburned fuel will fly into the exhaust if there is a shortage of oxygen. Then the engine smokes and consumes unnecessary fuel.

That’s why the H screw is adjusted together with the L screw. by increasing the fuel supply, the air supply is also increased.

The basic adjustment of the carburetor on a Partner 350 chain saw is made with two screws: L and H

See also  How to remove the carburetor from a lawn mower. Clogging the adjustment cavity

Adjustment is best done with the engine running, turning H and L screws 1/4 turn and seeing how the engine reacts when you press the accelerator pedal. If the engine’s lagging becomes less, turn the screws back another 1/4 turn. If the engine is getting worse, the settings are returned to the original position and the adjustment is made in the other direction.

With any adjustment, especially if the screws for some reason needed to tighten or unscrew completely, it is necessary to remember or write down the number of revolutions made. If the engine fails to start, this will allow you to return to the factory preset parameters.

Factory carburetor settings

Despite the standards, each carburetor and chainsaw has its own individual characteristics. Factory adjustment by hardware methods on equipped stands allows you to adjust the carburetor to the most optimal mode:

  • Engine runs steadily at idle rpm, chain does not crank.
  • The proportions of gasoline and air in the carburetor are optimal, and the gasoline burns out completely.
  • The engine revs up as soon as you pull the accelerator pedal and there is no excessive fuel consumption.

That’s why, when adjusting on your own, the factory parameters should be considered basic.

It’s not entirely clear from the video why it was necessary to tighten the screws all the way in, rather than starting the adjustment from the existing factory screw position. But the final result is positive, the carburetor is fine tuned.

Performing Disassembly

If you will be made to adjust the carburetor chainsaw Partner-350, then you should become more familiar with the device node, in many models, the design features do not differ from each other, so the recommendations will turn out to be relevant.

The elements must be removed with the utmost care, stacking them in order, during the reassembly process it will help you. Three bolts hold the top cover, you have to remove them, then you will see a layer of foam rubber, which acts as a part of the air filter. The wizard will have to get rid of the fuel hose, this will allow you to remove the drive rod.

Adjustment of the carburetor of a chainsaw Partner-350 is not possible if the tip of the cable is not removed, this should be done in the next step. The gasoline hose, which is to the left of the connector, will need to be removed. All of the above work will disconnect the carburetor, which can be subjected to adjustment. This mechanism is complicated, so if you need further disassembly, you need to remove the elements carefully, because their size is very small, so they can easily get lost.

How to remove the carburetor?

Adjusting the carburetor on a Partner P350S

Despite the fact that improper adjustment of the carburetor of a Partner P350S chainsaw can simply put the tool out of order, many craftsmen try to do this operation on their own, bypassing the service center. It is worth noting that this operation can be calculated as a breach of warranty, so all responsibility for the actions performed falls on the shoulders of the user.

Repair your Partner 350 with your own hands

Without certain skills and special tools, such as pins of various sizes or an ultrasonic bath, the repair of the Partner 350 carburetor comes down to replacing the repair kit.

WT-891 carburetor repair kit may consist of just gaskets and diaphragms, or it may include a full set of replacement parts. These are:

To replace a complete set, not having experience and tools is not possible, so when repairing 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 shows signs of failure, it is best to contact a professional to solve the problem.

| Denial of responsibility | Contacts |RSS