How To Repair A Poulan Chainsaw

What does a Carburetor do on a Chainsaw?

A Chainsaw carburetor is quite simple, as carburetors go, but it is not without intricacies. The purpose of a carburetor is to accurately command the extremely small-scale fuel quantities and mixing it with air that enters the engine so equally to make the engine run properly. When there is not enough fuel beingness mixed with air, there volition be lean-burn of the fuel and engine volition either not run or volition potentially become damaged. A lean mixture is as a result of not enough fuel or too much air. Usually, in a two-stroke engine such equally that of a chainsaw, fuel also provides the engine'due south lubricant. When in that location is, excessive fuel being mixed with air, the engine will "run rich" or become flooded with fuel, and might not start, or will run and emit a lot of smoke, or it will run poorly such that it stalls easily and bogs down, or even waste material fuel. Chainsaws that run lean or rich will emit excessive exhaust. Thus, a chainsaw that runs properly will have the proper fuel/air ratio, a healthy spark, and enough pinch for heating the fuel-air mixture. The carburetor is responsible for getting the right air/fuel ratio for the mixture. To find replacement Carburetors and other chainsaw parts CLICK Hither…

The carburetor in a chainsaw is relatively unproblematic as compared to other carburetors as it but needs to work in these iii situations;

• If you're trying to get-go the chainsaw cold.
• While the chainsaw engine is idling.
• When the chainsaw engine is open up wide.

Few people that operate a chainsaw are really interested in the gradations betwixt full throttle and idle. Thus, the incremental performances between these extremes is not really pregnant. All the same, for larger engines such equally that of a car, the many gradations are essential, which makes car carburetors far more complex.

A chainsaw carburetor has the post-obit chief features; First, the carburetor is more often than not a tube. Across this tube, at that place is an adjustable circular plate known as a throttle plate. Inside this tube, at that place is a narrowing at some point, and which is known as the venturi. In the venturi is where a vacuum is created. Inside the venture is a hole known as a jet, which allows the vacuum suck in fuel.

When a carburetor operates ordinarily at full throttle, the throttle plate is usually parallel to the tube's length, allowing for the maximum flow of air through the carburetor. The flow of air creates a vacuum inside the venture, and the vacuum sucks in a controlled fuel amount through the jet.

When the chainsaw engine is idling, then the throttle plate is oftentimes nearly airtight. In this case, at that place's is not plenty air flow through the venture to grade a vacuum. Nevertheless, on the throttle plate'south dorsum side, there is vacuum since the plate is preventing air flow. Should a tiny hole be drilled into the carburetor tube's side, the throttle vacuum could suck in air into the tube. The tiny hole is known as an idle jet. There is another screw labeled 'Lo' or 'L,' and which regulated the amount of fuel flowing via the idle jet.

When you endeavor starting the chainsaw with a pull-cord when the engine is cold, it runs at extremely low rpm. Also, the engine is cold and therefore requires a very rich air-fuel mixture to start. Now is when the choke plate comes into play. When it is activated, the plate will cover the venturi. When the venturi is covered, and the throttle broad open, a lot of fuel is sucked in past the carburetor engine via the main jet likewise as the idle jet. This results in a very rich mixture that allows the engine to fire either once or ii times, or just run slowly. Now if the choke plate is opened, the engine starts running normally.

How to Adjust the Carburetor on a Poulan Pro Chainsaw

The carburetor of a Poulan chainsaw has a single feature for tuning using a tool for increasing and decreasing the idle speed. The Poulan carburetor is ordinarily fix correctly from the mill. However, the adjustment may be necessary when the engine is running poorly, runs at high speed, or dies. An engine running at very high speed could get damaged or run inefficiently. An engine that runs at irksome speed then the normal may stall and die, and crave restarting often.

Tuning a Poulan carburetor need to be done when the engine is hard to start, dies after starting, or dies when under load. In such situations, the ratio of fuel and oil to air requires being enriched. Should the chainsaw audio every bit if its engine is running too rich, and then it revs at high speed and makes a high-pitched sound. In such case, the fuel-air mixture should exist made bacteria to avoid damage to the engine.

Before tuning the Poulan chainsaw carburetor, you outset place the chainsaw apartment level surface in such a way that the chain is overhanging the surface, or all items should be moved away, and so the concatenation doesn't contact annihilation. Since the concatenation moves during the adjustment, you should exist wearing protective gear including leather gloves, closed-toe shoes, long pants, long-sleeve shirt, and safety spectacles.

Adjusting the carburetor at idle speed, discover the idle speed screw marked with a 'T' right above the primer bulb. Now kickoff the chainsaw normally and allows it to idle, while making sure that the chain doesn't reach anything. Using a pocket-sized flat-headed screwdriver turn the idle speed spiral clockwise and so equally to increase the speed if the engine idles too slowly. When the chain starts moving, turn the idle screw counterclockwise so that the engine idles without stopping and the chain stops for the right idle speed.

How to Adjust the Carburetor on Homelite Chainsaw

Homelite carburetors, just similar those of other small-sized engines will frequently alter settings due to regular bumping and vibration during normal performance. Often information technology is not difficult to notation when in that location is need for adjustment of the carburetor setting. If the chainsaw does not idle normally and dies, then the fuel mixture is also lean. If the chainsaw idles too quick and the concatenation moves on its own, and so the mixture is also rich. In this cases, you demand to plow the idle-speed spiral and locate the point at which the engine will idle smoothly, and the concatenation doesn't move on its ain.

Before tuning the carburetor, you should check the air filter for droppings and dirt. To admission the filter, remove the ii screws securing the plastic cylindrical comprehend of the Homelite chainsaw. Pull off the encompass to access the filter. Loosen and remove the screw securing the filter. Tap the air filter on a surface to loosen dirt and dust. Launder the air filter using warm running h2o and liquid home detergent. Rinse and dry out information technology thoroughly and prepare it back onto the chainsaw and tighten the screw that held it. Set back the cover and secure it with its screws.

Adjusting the Homelite chainsaw carburetor involves tuning the idle speed screw. This screw is on the side of the chainsaw correct above the starter cord handle. To melody the idle speed, employ a screwdriver and insert it into the hole labeled with a 'T.' When the engine idles too quick, and the chain moves on its own without the throttle trigger being pressed, and so the mixture is too rich and requires to be made leaner. Turn the idle speed spiral counterclockwise in ¼ turn increments reducing the engine speed until the engine idles smoothly and when the concatenation stops moving. If the engine starts and run but does non idle when the throttle trigger is released, then turn the idle-speed spiral clockwise. Turn the idle screw in ¼ turn increments such that the chainsaw engine runs smoothly.

How to Adjust Carburetor on a Husqvarna Chainsaw

Place the Husqvarna saw on a apartment level surface ensuring at that place nothing contacting the chain when you lot will exist tuning the carburetor. Beginning the engine and allow information technology to run for five minutes to warm. Locate the 3 different aligning screws that are placed nigh the offset cord on the chainsaw's body. There is a letter of the alphabet stamped next to every screw. Rotate the spiral labeled 'Fifty' clockwise using a flat-caput screwdriver until the end. Do not turn the spiral across its natural stop. Rotate the spiral counterclockwise such that the chainsaw idles smoothly without stopping. To test the engine, press the throttle trigger. Conform the screw labeled 'L' until the chainsaw accelerates smoothly and sounds polish.

Place the flat-head screwdriver on top of the idle-speed adjustment spiral which is labeled 'T.' Turn the spiral in a clockwise direction until the chain starts moving. Immediately start turning the screw counterclockwise such that the chain stops moving. The chainsaw should maintain the idle speed while the concatenation does not turn.

Turn the adjustment spiral labeled 'H' in a clockwise direction using the flat-head screwdriver to the screw'south natural end. At this bespeak, the engine sounds very rough. Now turn the screw in the clockwise direction until the engine on your Husqvarna is running smoothly. On squeezing the throttle trigger, the chainsaw should accelerate without difficulty and will non blow smoke from its exhaust.

How to Adjust a Craftsman Chainsaw Carburetor

Before adjusting a Craftsman chainsaw carburetor, you will need to have a pocket-sized flathead screwdriver and a piece of wood.

Put the chainsaw on a apartment level surface and ensure nothing is in contact with the chain. Locate iii carburetor adjustment spiral institute on the side of the fan housing and start string. The two screws at the top are labeled 'L' and 'H.' The screw labeled 'L' is for low-speed adjustments while the 'H' screw is for high-speed adjustments. The bottom spiral labeled 'I' is for idle adjustments.

Turn the 'Fifty' and 'H' screws clockwise until their natural stop. Turn both screws on counterclockwise i full plough.

Now start the chainsaw and let the engine idle for two to three minutes. When the engine idles to low or sputters, then slowly rotate the 'I' spiral in clockwise direction until the chainsaw engine runs smoothly. When the engine idles to high, then slowly rotate the 'I' screw in counterclockwise direction until the chainsaw runs smoothly.

While the engine still runs, adjust the screw labeled '50.' Slowly rotate the 'L' screw on clockwise until the chainsaw's RPMs drop. Note the screw's position. Now slowly rotate the 'L' screw on counterclockwise until the chainsaw's RPM speeds up and then lowers again. Marker the spiral'due south position. Adjust the '50' screw between these two marked positions.

Examination the saw past making a cut on the piece of wood. Should the saw seem to lose its power through the test cut, or exhaust smoke, turn the screw labeled 'H' clockwise slightly and attempt making another cut. Keep on turning very slightly until the your Craftsmen Chainsaw tin can cut through the piece of forest smoothly without smoke.

Stihl Chainsaw Carburetor Rebuild

Before disassembling the carburetor, it is important to clean it by wiping it downwards using newspaper towels as well every bit bravado off loose dirt.

1. Commencement past removing the plate roofing the diaphragm and cheque if it is used well. Remove the gaskets and place them down in the social club you disassembled them. Flip the carburetor over and take out the other cover afterwards loosening the Philips caput screw. A gasket and screen will be uncovered on this side. Also, lay them down in the order you lot disassembled them.
2. Earlier replacing the gaskets, you may need to make clean or supervene upon the fuel screen and needle valve. At this stage, you need to be cautious as the components here are small and may fall and become lost. You lot volition encounter a rocker held in identify using a Philips caput-screw. Put your thumb on the rocker's side closest to the carburetor's side. After loosening and removing the screw, slowly remove your thumb and collect the needle, screw, spring, and rocker arm. You may consider placing these tiny components on a magnetic surface.
3. With every gasket remover, now you can clean the carburetor using a cleaner. Soak it and allow the cleaner to pass through every passage in the carburetor.
4. Subsequently cleaning or replacing any component you needed to replace, you can first reassembling the carburetor. Start by putting dorsum the screen. Now put dorsum the needle valve by first returning the pocket-size bound back where it was. Put the needle back into the rocker's arm. Put the rocker'southward arm and the needle dorsum into the carburetor. Once more, press your thumb on the rocker's side as place back the Philips screw.
5. Moving to the gaskets, you basically just aline the holes and lay them back down past flipping them dorsum. Practice the same for the other side. Identify back the gasket parts by flipping them back.
6. At present the carburetor is fully reassembled. Y'all can place it dorsum on the chainsaw by first re-attaching the gas tube and throttle wire. The gas pipe is the longest of the two tubes and reconnects at the black barb. Once these ii accept been reattached, the carburetor can exist placed on the threaded stud. The chrome barb lines up with and will cocky-attach to the impulse pipe. At present tighten the nuts.
7. Lastly, you lot need to reconnect the throttle wire with the trigger. If none of the aligning screws were turned during the rebuilding process, the carburetors should be adept and working.

Hopefully this guide has been useful. Chainsaws can be tricky to set up and maintain, if you are finding it likewise hard, maybe its fourth dimension for a change go started by looking at our chainsaw ownership guide to brand life easier.

Source: https://theprocutter.com/how-to-adjust-a-chainsaw-carburetor/

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