What go a Carburetor do on a Chainsaw?

A Chainsaw carburetor is quite simple, as carburetors go, however it is not without intricacies. The function of a carburetor is to accurately regulate the extremely little fuel quantities and also mixing it with air the enters the engine so as to make the engine run properly. When there is not enough fuel being mixed with air, there will certainly be lean-burn the the fuel and engine will either not run or will certainly potentially gain damaged. A skinny mixture is together a an outcome of not sufficient fuel or too lot air. Normally, in a 2-stroke engine such together that of a chainsaw, fuel likewise provides the engine lubricant. As soon as there is, too much fuel being mixed with air, the engine will “run rich” or obtain flooded through fuel, and might no start, or will run and emit a many smoke, or it will certainly run poorly such the it stalls easily and also bogs down, or also waste fuel. Chainsaws that run lean or rich will emit too much exhaust. Thus, a chainsaw the runs appropriately will have the appropriate fuel/air ratio, a healthy spark, and also enough compression for heater the fuel-air mixture. The carburetor is responsible for gaining the ideal air/fuel proportion for the mixture. To find replacement Carburetors and other chainsaw parts CLICK HERE…

The carburetor in a chainsaw is reasonably simple as compared to various other carburetors together it only demands to work in these three situations;

If you trying to start the chainsaw cold.While the chainsaw engine is idling.When the chainsaw engine is open up wide.

You are watching: How to adjust a poulan chainsaw carburetor

Few world that run a chainsaw space really interested in the gradations between full throttle and also idle. Thus, the incremental performances in between these extremes is no really significant. However, for larger engines such as that the a car, the countless gradations are essential, which makes auto carburetors far an ext complex.

A chainsaw carburetor has the complying with main features; First, the carburetor is usually a tube. Across this tube, there is an adjustable circular plate known as a throttle plate. Within this tube, over there is a narrowing at part point, and also which is known as the venturi. In the venturi is wherein a vacuum is created. Within the venture is a hole recognized as a jet, which allows the vacuum sucking in fuel.

When a carburetor operates normally at full throttle, the throttle plate is usually parallel come the tube’s length, enabling for the maximum flow of air through the carburetor. The circulation of air create a vacuum within the venture, and also the vacuum suck in a controlled fuel amount through the jet.

When the chainsaw engine is idling, climate the accelerator plate is often virtually closed. In this case, there’s is not sufficient air circulation through the venture to kind a vacuum. Nevertheless, ~ above the throttle plate’s back side, over there is vacuum because the key is avoiding air flow. Have to a small hole it is in drilled right into the carburetor tube’s side, the throttle vacuum could suck in air right into the tube. The tiny hole is recognized as one idle jet. There is an additional screw labeled ‘Lo’ or ‘L,’ and also which regulation the quantity of fuel flow via the idle jet.

When girlfriend try starting the chainsaw v a pull-cord as soon as the engine is cold, it operation at extremely low rpm. Also, the engine is cold and also therefore requires a an extremely rich air-fuel mixture to start. Now is when the choke bowl comes right into play. As soon as it is activated, the plate will certainly cover the venturi. As soon as the venturi is covered, and the throttle wide open, a most fuel is sucked in by the carburetor engine via the key jet and the idle jet. This results in a really rich mixture that permits the engine come fire either as soon as or 2 times, or simply run slowly. Currently if the choke bowl is opened, the engine starts to run normally.

How to change the Carburetor ~ above a Poulan agree Chainsaw


The carburetor the a Poulan chainsaw has a solitary feature because that tuning utilizing a tool for increasing and also decreasing the idle speed. The Poulan carburetor is usually collection correctly indigenous the factory. However, the adjustment might be important when the engine is to run poorly, runs at high speed, or dies. An engine running at an extremely high speed can get damaged or run inefficiently. One engine that runs at slow speed then the normal may stall and also die, and require restarting often.

Tuning a Poulan carburetor must be done as soon as the engine is difficult to start, die after starting, or dies as soon as under load. In such situations, the ratio of fuel and also oil to air needs being enriched. Should the chainsaw sound together if its engine is running also rich, then it revs in ~ high speed and makes a high-pitched sound. In such case, the fuel-air mixture need to be made leaner come avoid damages to the engine.

Before tuning the Poulan chainsaw carburetor, you an initial place the chainsaw flat level surface ar in together a method that the chain is overhanging the surface, or all items should be moved away, so the chain doesn’t call anything. Due to the fact that the chain moves during the adjustment, you have to be wearing protective gear including leather gloves, closed-toe shoes, long pants, long-sleeve shirt, and also safety glasses.

Adjusting the carburetor in ~ idle speed, discover the idle speed screw significant with a ‘T’ right over the inside wall bulb. Currently start the chainsaw usually and allows it come idle, while making sure that the chain doesn’t with anything. Using a small flat-headed screwdriver revolve the idle rate screw clockwise so as to increase the rate if the engine idles also slowly. When the chain start moving, turn the idle screw counterclockwise so the the engine idles without stopping and also the chain stops because that the right idle speed.

How to readjust the Carburetor top top Homelite Chainsaw


Homelite carburetors, just like those of various other small-sized engines will certainly often adjust settings due to continual bumping and also vibration during normal operation. Often it is not difficult to keep in mind when there is require for mediate of the carburetor setting. If the chainsaw does not idle normally and also dies, climate the fuel mixture is also lean. If the chainsaw idles also quick and the chain moves on its own, climate the mixture is as well rich. In this cases, you need to turn the idle-speed screw and locate the allude at i beg your pardon the engine will certainly idle smoothly, and the chain doesn’t move on that own.

Before tuning the carburetor, girlfriend should inspect the air filter for debris and also dirt. To access the filter, eliminate the two screws securing the plastic cylindrical covering of the Homelite chainsaw. Pull turn off the cover to accessibility the filter. Loosen and also remove the screw securing the filter. Insanity the wait filter on a surface to loosen dirt and dust. To wash the wait filter using warm running water and also liquid home detergent. Rinse and dry the thoroughly and also fix it ago onto the chainsaw and also tighten the screw that held it. Collection back the cover and secure it with its screws.

Adjusting the Homelite chainsaw carburetor entails tuning the idle speed screw. This screw is on the next of the chainsaw right above the starter cord handle. To song the idle speed, usage a screwdriver and insert it right into the feet labeled v a ‘T.’ once the engine idles also quick, and the chain moves on its very own without the throttle cause being pressed, climate the mixture is too rich and also requires to it is in made leaner. Rotate the idle rate screw counterclockwise in ¼ revolve increments reduce the engine speed until the engine idles smoothly and when the chain stops moving. If the engine starts and also run however does no idle when the throttle trigger is released, then turn the idle-speed screw clockwise. Rotate the idle screw in ¼ rotate increments such that the chainsaw engine runs smoothly.

How to readjust Carburetor ~ above a Husqvarna Chainsaw


Place the Husqvarna experienced on a flat level surface ensuring over there nothing contacting the chain as soon as you will be tuning the carburetor. Start the engine and enable it to run for 5 minutes to warm. Situate the 3 various adjustment screws that are inserted near the start cord on the chainsaw’s body. Over there is a letter stamped alongside every screw. Revolve the screw labeling ‘L’ clockwise utilizing a flat-head screwdriver until the end. Do not revolve the screw past its organic stop. Turn the screw counterclockwise such that the chainsaw idles smoothly without stopping. To test the engine, push the throttle trigger. Readjust the screw labeling ‘L’ until the chainsaw increases smoothly and sounds smooth.

Place the flat-head driver on height of the idle-speed convey screw i m sorry is labeling ‘T.’ rotate the screw in a clockwise direction until the chain beginning moving. Immediately start transforming the screw counterclockwise such that the chain stops moving. The chainsaw should keep the idle rate while the chain does not turn.

Turn the adjustment screw labeling ‘H’ in a clockwise direction making use of the flat-head driver to the screw’s herbal stop. At this point, the engine sounds an extremely rough. Now turn the screw in the clockwise direction until the engine on her Husqvarna is running smoothly. ~ above squeezing the accelerator trigger, the chainsaw need to accelerate without challenge and will certainly not blow smoke native its exhaust.

How to adjust a Craftsman Chainsaw Carburetor


Before adjusting a Craftsman chainsaw carburetor, friend will need to have a small flathead screwdriver and also a piece of wood.

Put the chainsaw top top a flat level surface and also ensure nothing is in contact with the chain. Situate three carburetor adjustment screw uncovered on the side of the pan housing and also start cord. The two screws at the optimal are labeling ‘L’ and also ‘H.’ The screw labeled ‘L’ is because that low-speed adjustments while the ‘H’ screw is for high-speed adjustments. The bottom screw labeling ‘I’ is for idle adjustments.

Turn the ‘L’ and also ‘H’ screws clockwise until their natural stop. Turn both screws ~ above counterclockwise one full turn.

Now begin the chainsaw and let the engine idle for 2 to 3 minutes. Once the engine idles to low or sputters, then slowly rotate the ‘I’ screw in clockwise direction till the chainsaw engine operation smoothly. Once the engine idles to high, then gradually rotate the ‘I’ screw in counterclockwise direction till the chainsaw operation smoothly.

While the engine quiet runs, readjust the screw labeled ‘L.’ gradually rotate the ‘L’ screw ~ above clockwise until the chainsaw’s RPMs drop. Keep in mind the screw’s position. Now slowly rotate the ‘L’ screw on counterclockwise until the chainsaw’s RPM speeds up and then lowers again. Mark the screw’s position. Change the ‘L’ screw between these two marked positions.

Test the saw by do a cut on the piece of wood. Should the saw seem to shed its power through the check cut, or exhaust smoke, turn the screw labeling ‘H’ clockwise slightly and try making an additional cut. Store on turning very slightly until the her Craftsmen Chainsaw can cut through the piece of timber smoothly there is no smoke.

Stihl Chainsaw Carburetor Rebuild


Before disassembling the carburetor, that is important to clean that by wiping it down using file towels and also blowing off loose dirt.

Start by remove the plate covering the diaphragm and check if the is provided well. Eliminate the gaskets and also place them down in the order you disassembled them. Upper and lower reversal the carburetor over and take out the various other cover after ~ loosening the Philips head screw. A gasket and also screen will certainly be uncovered ~ above this side. Also, lay them under in the order you disassembled them.Before instead of the gaskets, you may need to clean or replace the fuel screen and also needle valve. In ~ this stage, you must be mindful as the contents here are tiny and may fall and also get lost. Girlfriend will see a rocker organized in place using a Philips head-screw. Placed your thumb on the rocker’s side closest to the carburetor’s side. After loosening and removing the screw, progressively remove her thumb and also collect the needle, screw, spring, and rocker arm. Girlfriend may think about placing these tiny contents on a magnetic surface.With every gasket remover, currently you have the right to clean the carburetor utilizing a cleaner. Soak the and enable the cleaner to pass v every i in the carburetor.After clean or replacing any kind of component you necessary to replace, you deserve to start reassembling the carburetor. Begin by putting ago the screen. Now put ago the needle valve by first returning the little spring back where that was. Placed the needle ago into the rocker’s arm. Placed the rocker’s arm and also the needle ago into the carburetor. Again, push your ignorance on the rocker’s side together place earlier the Philips screw.Moving to the gaskets, girlfriend basically simply aline the holes and lay them earlier down by flipping castle back. Execute the exact same for the other side. Place earlier the gasket parts by flipping lock back.Now the carburetor is totally reassembled. You have the right to place it back on the chainsaw by very first re-attaching the gas tube and also throttle wire. The gas pipeline is the longest that the 2 tubes and also reconnects in ~ the black barb. As soon as these two have actually been reattached, the carburetor can be inserted on the threaded stud. The chrome barb lines up with and also will self-attach to the advertise pipe. Now tighten the nuts.Lastly, you need to reconnect the accelerator wire through the trigger. If none of the mediate screws were turned during the rebuilding process, the carburetors should be an excellent and working.

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Hopefully this guide has to be useful. Chainsaws deserve to be tricky come fix and maintain, if you space finding it as well hard, maybe its time for a adjust get began by looking at our chainsaw buying overview to do life easier.