The carburetor in a chainsaw is needed to mix and supply fuel to the engine's combustion chamber. If the carburetor is adjusted correctly, then the operation of the equipment will be reliable in all modes, and fuel consumption will be economical. In general, this rule applies to all internal combustion engines.
When and why to adjust
The procedure for adjusting the carburetor is usually carried out quite rarely. The highest quality and best option is the factory setting. But if necessary, it can be done by adjusting the appropriate screws. The carburetor in a chainsaw is necessary for the preparation of an air-gasoline mixture, which must have a certain ratio of ingredients. If the balance is not maintained, then the engine will begin to malfunction.
Mixture that does not meet specifications may be oversaturated or lean. In the first case, the amount of fuel in relation to air is increased, inthe second one has more air than it needs, and less fuel. The article will discuss the adjustment of the carburetor using the Husqvarna 142 chainsaw as an example.
Signs of poor performance
Some symptoms may indicate carburetor malfunction. For example, if the engine stalls quickly or starts hard, a lean mixture may be the cause. Excessive fuel consumption is also a problem. You should also be alerted by intense exhausts. The reason is a supersaturated mixture.
Sometimes it happens that the engine does not want to work at all. There can be 2 reasons for this: no spark or gasoline. In the second case, the problem is expressed in clogging of the fuel jet, in the first case, the problem is a faulty spark plug or failure of the electronic unit.
Settings can go wrong quite rarely, but the reasons are:
- wear of the piston group;
- violation of the fastenings of the adjusting screws;
- Carburettor dirty.
In the first case, the adjustment will not help much, you need to think about replacing the saw or repairing the engine. As for the violations of the fasteners, here the reason may lie in an inaccurate touch or strong external vibration. Sometimes an attempt at rough adjustment leads to a violation.
What else to look for
Clogging of the carburetor also leads to a failure of the settings. The reason is the unsatisfactory condition or breakdown of the air filter, the ingress of scale into the fuel channels, the use of low-qualityfuel. In these cases, you should first flush the fuel system, and after that you can adjust.
Making adjustments
Husqvarna 142 carburetor adjustment should be done using a tachometer. You must be able to work with it. If experience allows, manipulations can be carried out by ear, determining the maximum speed by sound. In other cases, a positive result may not be achieved. The Husqvarna 142 carburetor is adjusted with one, two or three screws. You can distinguish them by designations.
Idle speed is adjusted with the screw under the letter T. You can adjust the minimum speed with the screw L. While the screw H is for maximum speed. You will see one idle screw and two others hidden behind the shroud. This version of the carburetor is explained by the fact that the manufacturer recommends that the operator adjust only one idle screw, since otherwise the optimal settings are set at the factory. But for some extreme modes, you can make adjustments.
Work methodology
The Husqvarna carburetor is adjusted with screws L and H, if gasoline is used in operation that differs from that recommended by the supplier. If the octane number is low, to increase it, turn the screw by unscrewing it. This will increase the speed and power. But with an increased octane number for itlowering, turn the screw in the opposite direction by tightening it. This will help reduce engine speed.
When adjusting a Husqvarna carburetor, the screws must be used in the following order: L - H - T. By maintaining precise angles of rotation, you will follow the requirements that will allow you to maintain the best engine performance. There is no universal way to adjust. Procedures may differ from one another. But the process is usually divided into two stages. The first is basic, the 2nd is final. The basic one is done with the engine turned off, while the final stage involves warming up the engine for 10 minutes.
Important for owners
The carburetor of the Husqvarna 142 saw is adjusted with a key, also called a screwdriver. Some manufacturers use proprietary keys. If you have them, you should try not to lose them, because it will be quite difficult to find them on sale.
Specifications
In order to ensure long-term operation of the described equipment, you need to know how to adjust the Husqvarna 142 carburetor with your own hands. This was discussed above. However, this is not the only thing that the future owner of such a device should know. Before buying such equipment, it is important to inquire about the technical characteristics. For example, to evaluate whether you are satisfied with the weight, which is 4.6 kg. By the way, it is well balanced, sothe saw fits comfortably in the hands.
The shape of the handles is ergonomic, which guarantees a secure grip during difficult jobs. Inside there is a vibration protection system, and the work is not accompanied by too high a noise level. All this contributes to high labor productivity and the preservation of human performance during large-scale work.
Do-it-yourself adjustment of the Husqvarna 142 carburetor is quite simple if you read the instructions. From it you can find out that the power of the device is 2.6 liters. s., or 1.9 kW. The chain pitch is 0.325 inches. The number of links is 64.
The kit comes with a chain, the thickness of which is 1.3 mm. The engine displacement is 40.2 cm3. The tire length is 38 cm or 15 inches. The oil and fuel tanks hold 0.2 and 0.41 liters respectively.
Consumer Reviews
You can adjust the Husqvarna 142 chainsaw yourself. Consumers consider this feature a plus, as well as the fact that the crankshaft in the design is made of forged steel. The fairly easy access to the air filter should also be considered an advantage. The ignition system is durable and simple. The piston group has two compressor rings, which have an increased working resource. The manufacturer emphasizes that they will be ready to serve up to 5 years.
Customers also like the fact that the cylinder liners have a chrome wear-resistant coating. You may not need to adjust your Husqvarna carburetorbecause, according to the manufacturer, it is the best in its class. The design is also good because it provides for the presence of a built-in primer. It is a pump that provides the engine with a quick start. This feature is independent of ambient temperature.
Work instructions and repair features
From the instructions you can find out that the carburetor adjustment of the Husqvarna 142 chainsaw is carried out after the machine is broken in. It is important to know that the maximum revolutions are 12,500 per minute. Idling speed reaches 2500 per minute. If the saw, after switching to a different type of fuel, begins to behave differently at start-up, at high speeds and during acceleration, fine adjustment may be required. Before this, the air filter is cleaned and the cylinder cover is installed in place. Adjusting with a dirty air filter may result in a lean mixture, causing engine damage.
As for the repair of the Husqvarna 142, there are several main breakdowns and ways to fix them. You must be aware of the approximate causes that lead to a malfunction. Among others, engine problems should be highlighted. If it runs non-stop, won't start, or starts but stalls frequently, you need to inspect the spark plugs. When starting the equipment in cold weather, it may happen that the combustion chamber is flooded withfuel mixture. In this case, the candle is unscrewed, and the combustion chamber is dried by an idle plant. The spark plug needs to be cleaned and try to start the saw again.
Do not underestimate the failure of the muffler. If it fails, the saw may not start or lose power. When disassembling this part of the chainsaw, you can inspect and get rid of soot. It may contain carcinogens that are hazardous to he alth, so dry cleaning should be avoided as it can cause inhalation of harmful substances.
After the muffler is removed, plug the engine outlet with a clean rag. The muffler gets clogged for several reasons. The first of these is the use of the wrong fuel mixture. The second reason is using the wrong oil.
In conclusion
From the factory, chainsaws have carburetor settings that are best left untouched. But under certain operating conditions and when using gasoline not recommended by the manufacturer, such work may be required. Therefore, you can adjust the carburetor of the Husqvarna 142 chainsaw with your own hands.
