STIHL not picking up speed. Leaky carburetor and clogged injector

Reasons why the STIHL 180 rpm does not rev up

Almost every hand-held gasoline tool has a two-stroke engine as the power unit. These motors have advantages over the four-stroke. They are lighter in weight but have the same power. But they also have disadvantages in the form of adding oil to the gasoline and lower fuel economy. There are two main causes of malfunctions on your STIHL power saw:

  • The engine does not start. Cold start and hot start are different. To start a cold engine it is necessary to use the choke, which reduces the air intake and increases the percentage of gasoline in the fuel-air mix.
  • A chainsaw starts and stops before it reaches revolutions. You have to use the throttle trigger all the time to keep the engine speed up.
  • The engine stops when working under load and does not develop optimum performance.

Malfunctions can be caused by mechanical reasons, as well as problems related to electrical equipment.

Chainsaw doesn’t move fast: check the device for malfunctions

The ignition module can be diagnosed visually for malfunctions. To do this, you will need:

  • Unscrew the spark plug;
  • Assess its appearance (it should not be filled with gasoline or contain a dark patina);
  • Check the distance between the coil and the magnets (up to 0,2 mm);
  • As needed, check the spark plug assembly for spark with a serviceable mains wire.

If after checking the defects are not found, it is worth moving on to check the carburetor unit.

This working unit. one of the most vulnerable in modern chainsaws. New tools that come from the factory have basic options. For low and high speeds, which should be discounted after running-in and running-in of all parts. If you can’t develop the appropriate torque according to the instruction manual, you might have to do the same thing.

stihl, speed, carburetor, clogged

In this case it is necessary to readjust one of them. jack “H” responsible for the saw’s operation under load. To do this, quite adjust the fuel supply with the engine running at the highest chain speed with a tachometer and an operating manual.

Troubleshooting chainsaw carburetor

Removing the carburetor from the chainsaw. Remove fuel pump cover with diaphragm by removing one screw in the center of the cover. Then with the throttle, turn the carburetor toward you, on the side where the two holes, one shows the pin and under it the booster pump. Remove the retaining ring from the outside of the pin and disconnect the spring wire choke. unscrew the screw in the center of the throttle, remember how the throttle stands (so you can install it later) and remove the throttle. Use your finger to plug the hole with the pin (the gas pedal is spring loaded, and if you pull the throttle shaft out and don’t plug the hole, the gas pedal will pop out), then rotate the throttle shaft and remove it. Shaking the gas pedal (piston) with a spring out of the hole. There is a rubber sleeve (ring) on the piston. its wear and tear is a prerequisite for chainsaw malfunction. Need to replace the piston and rubber gasket with a new spring (kits available). Or pull out the worn piston with a spring, and plug the hole with a rubber plug (the chainsaw will not have a booster pump, t.Е. It will accelerate in four seconds, not three, but it will run well because there will be no carburetor air intake).

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Checking the fuel filter

The fuel filter is in the tank of the STIHL 180 and it is awkward to pull it out. To facilitate the process, you can take a small piece of dural wire and bend it on the end, then use it to hook the fuel hose and pull it together with the filter from the tank. To check the filter, you need to blow into it; if no air passes, it means that the cause is found and the filter must be changed.

If the filter is unobstructed, check the fuel hose for blockages. To check, disconnect it from the carburetor and blow into it with the air filter removed. If it is blockage, the hose can be cleaned mechanically with a wire and then blown with compressed air.

STIHL 180. Classic of the genre. Does not pick up speed

PC180 has aspects that force the owners to worry, and spend a lot of money.

Visually inspect the spark plug

A visual inspection of the spark plug can tell you a lot about engine performance:

  • Damp working part that wraps into the cylinder indicates a malfunction in the power system. Fuel mixture is excessively enriched. Carburetor needs adjustment. Or the oil to gasoline ratio is incorrect. Oil is overfilled and does not have enough time to be burned within the piston stroke. Carbon deposits appear. Clean it off with sandpaper. In no case it is necessary to ignite the spark plug with an acetylene or gasoline torch. The inner part of the spark plug may then separate.
  • Weak spark. To see the spark, the spark plug has to be unscrewed. Then a high voltage wire is connected to it, and the metal part of the plug is pressed to the cylinder. After that you need to pull the starter, and at this time look at the electrodes of the plug. Weak, unstable spark can indicate poor contacts in the connection to the high-voltage wire, improper electrode gap. Different candles have this gap of 0.5 to 0.7 mm. As the inner electrode gradually burns out during operation, the gap increases. To restore the distance, the outer electrode should be knocked down a little, or a new spark plug should be supplied.
  • Plug leakage. Sometimes you might notice a dark edging between the insulator and the metal nut. This indicates that the metal part has detached from the ceramic. With a spark plug like this, the chainsaw will stall or stop working irregularly. This is because the spark is penetrating into the cylinder through the spark plug housing. Leakage can occur with a cheap low-quality candle, or if at the time of installation, it was overtightened.
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If the STIHL chain saw MS 180 stops idling, fails to pick up power when ripped on the gas or just stalls at full throttle, it is necessary to check the fuel system and check the crankcase for leaks. You can do it yourself, but you need to have certain skills. If you are unfamiliar with two-stroke saws, it is best to consult an expert. к. This technique is pretty capricious and any errors are costly.

Although the chainsaw is a simple device, from time to time its work has malfunctions that can only be corrected by disassembly. The following malfunctions can be cited as examples:

  • The chainsaw does not pick up speed;
  • the chainsaw stops functioning in the cut;
  • the chainsaw starts and stops;
  • The chainsaw loses its power;
  • chain saw stops when you press.

Most often the faults are caused by the malfunctioning of the engine, but also by faults in other systems and components. The correct handling of this equipment is of great importance. If all the rules of use are followed, problems are likely to be the most obvious. When searching for malfunctions it is advisable to begin with checking the simplest part of the chainsaw and finish with the most complex one.

The main elements of chainsaws

Before we begin to delve into the issues of breakdowns and repair tools, let’s first understand what the chainsaw actually consists of. First, I would like to note that this tool belongs to the category of equipment, whose work is directly dependent on the gasoline engine.

It is also important that chainsaws are equipped with an engine that has a single cylinder, and the work is done on this kind of fuel, like gasoline. It is important to note that while it is similar to other machines, it does not have a gearbox

It is replaced by a typical single chain gear, the means of which are used to move the chain itself (saw).

stihl, speed, carburetor, clogged

In fact, chain saw is a fairly common design, but this does not prevent it to be reliable, comfortable and able to provide a particular smooth and cyclic work entirely, even in fairly difficult conditions. On a STIHL chain saw STIHL 180 does not start and fills the plug. The STIHL Ls 180 chain saw requires very little maintenance. STIHL STIHL 180 chain saw. malfunctions and This tool consists of a huge range of specific parts “vital” for proper and productive. It has a carburetor, a specific chain tensioning device, a bar complete with a chain and other elements.

Before you buy a chain saw, be sure to look at all the options and choose the brand of chain saw that is right for you.

To make it easy for you to choose, we’ve put together a reliability rating for chain saws.

If you’re on a tight budget, take a look at this article about Russian chainsaw makers.

Replacing the oil seals

How to repair a STIHL 180 chain saw when the oil seals need replacing? It’s necessary to disassemble the engine, which first requires removing it from the chainsaw. To remove it, follow the removal procedure described under: “The STIHL 180 chain saw control knob is broken. how to fix it”.

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After removing the engine, unscrew the four screws that hold the engine sump and remove it. Thus, after removing the pallet, we get access to the oil seals and bearings of the crankshaft.

The most important factor when replacing the oil seals is to put them back in and seal the oil pan.

To do it properly it is necessary to clean and degrease the pallet and the place of its installation on the saw cylinder, and then to put sealant and to install the pallet, tightening it crosswise to the required force.

At the time of installation of the sump, it is important not to mix up the location and install so that the casting to hold the oil pump housing, was located in the opposite direction from the flywheel, otherwise put the engine back into the body of the saw, will be impossible.

Reassembly of the chainsaw after repair is carried out in the reverse order.

What to do if the chainsaw does not hold idle speed?

Idling problems are considered constant companions of chainsaws. There can be several prerequisites that could lead to a stalling at startup and chain cranking while idling, the main ones being:

  • clogging of the air and gasoline filter;
  • poor-quality fuel mixture or improperly prepared fuel mixture;
  • Problems with the ignition module;
  • The carburetor, the settings of which no longer correspond to the load on the saw;
  • The motor components are deformed or rusted.

Consistently perform a series of actions:

  • Flush the fuel hose or replace it with a new one,
  • Clean the air filter that may have become clogged with sawdust and dirt particles. Modern air filters are reusable and can be washed with detergent and completely removed from the body of the saw;
  • check the gasoline and engine oil, which may be of poor quality or simply not suitable for this saw;
  • test the spark plugs and carburetor.

Why does it stop at full throttle?

It is very common to hear the question of why a chainsaw stalls at full throttle. There could be several possible causes. First, you need to consider exactly how the saw stalled. Let’s say the tool was working fine and suddenly, for no apparent reason, it suddenly stopped and the starter does not turn. In such a situation, you can be 100% sure that the chainsaw has jammed and you need to proceed with its overhaul.

The second situation is when the STIHL 180 chain saw worked normally, then gradually over a short period of time lost power and stalled, with overheating of the cylinder. In this case, most likely the cause of air leakage under the rubber pipe connecting the carburetor to the cylinder or its breakage. The mixture is depleted, resulting in overheating. To eliminate the cause, you can change the nozzle.

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