Need to locate carb adjustment
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More than likely, your carburetor needs cleaned. I like to use a Den Tek Brush, (used for cleaning teeth), to clean out the small ports in carb. Make sure that the small screen is clean and free of debris. If after you do this, and it still doesn’t run properly, then you will need to buy a carb. kit and replace the gaskets, needle valve, and small screen. You may have extra gaskets left over, but that’s o.k. because that is the way they come.Jim

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Replace the filter, start the saw and turn the “T” screw counterclockwise to increase the fuel mixture and the idle speed; turning the screw counterclockwise decreases both. You`ve achieved the proper fuel mixture when the engine idles smoothly but the chain doesn`t spin.
The carburetor might be clogged. A clogged carburetor is often caused by leaving fuel in the chainsaw for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the chainsaw engine to stall.
The letters on the screws represent High (H), Low (L) and Idle (T). The H screw regulates the Air/Fuel mix during high RPMs, while the L Screw does the same during low RPMs. The T screw regulates how much fuel is sent to the carburettor while idling until the throttle is pressed.
If the carburetor is new or has been rebuilt, you should set it to “factory” adjustment. You can do so by adjusting the idle mixture screws to 1.5-2 turns out, and the idle speed screw to 1-1.5 turns in. Warm the Engine Up. The engine`s running temperature directly correlates with proper air and fuel mixtures.
Inside a Carburetor

The carb on a chain saw is simpler than most carbs because it really has only three situations that it has to cover: It has to work when you are trying to start the engine cold. It has to work when the engine is idling. It has to work when the engine is wide open.

There are many factors that can stop your chainsaw from running, including a bad spark plug or dirty air filter. There are simple problems: a broken fuel line, bad fuel, wrongly calibrated high-low adjustment screw. Also, more complex issues like a damaged carburettor or an engine compression problem.
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Poulan is a brand name of the Swedish manufacturer Husqvarna AB.
1. Dull chain and or improper lubrication to the bar and chain, sharpen and or clean the bars oil holes. 2. Air filter and fuel filter for restrictions and contamination, clean or replace as needed.
When your car`s throttle is malfunctioning, this can cause your car to stall or idle high. Often this is a result of dirt buildup in the air intake. Other times it can be a problem with a cracked intake tube. If the IAC motor`s vacuum port is leaking, this can be another cause of high engine idling.
If an engine is not getting enough fuel (this is called “running lean”), due to fuel pressure (regulated by the fuel pump and regulator), restricted fuel injectors, a vacuum leak or really anything that throws off the fuel mixture going in to the engine, this can cause the surge.
Though on your particular vehicle high idling will likely be caused by a dirty idle air control valve, or carbon buildup on the throttle plate. The idle air control valve will be partially cleaned when cleaning the throttle body.
This method involves looking at the base of the spark plug insulator (white part of the plug) for a slight coloring on the insulator just above where the insulator comes through the steel case. If the mixture is too lean, it will leave no color, while a rich mixture will cause the fuel ring to become more prominent.
To check fuel delivery, remove the fuel line where it enters the carburetor and use a length of rubber hose to direct the flow into bottle or similar container. Fuel should pulse out in strong spurts if your engine is equipped with a mechanical fuel pump (electric fuel pumps are more of a steady stream).
Now regardless of whether it`s on a garden strimmer, lawnmower or chainsaw, whenever we pull the throttle on a 2 stroke engine and get a bogged down sound it`s almost always caused by an insufficient amount of fuel reaching the engine.
The “Bog” simply means the engine is not receiving enough fuel when you go to wide open throttle. While there are other issues that may cause similar reactions within the carburetor, often the problem can be traced back to the accelerator pump system. Incorrect adjustment is the typical culprit.
If the carburetor is clogged, it may only work with the choke engaged, which is not a good way to be running your engine. Cleaning the carburetor and replacing some of the internal parts with a new carb kit is a great way to get your carburetor running properly again.
A fuel line blockage or a small crack in the fuel line can let air into the fuel line, and can cause fuel to leak, preventing your engine from running at full power. To replace the fuel lines, simply disconnect them from the fuel filter and the carburetor, and replace them with new ones.
Generally, two-stroke chainsaw engines are built to conveniently run at full throttle without an engine breakdown. Therefore, running at any throttle speed below the full throttle is not advised. Cutting a thick wood or timber while running at a low speed or throttle can cause the blades of the chainsaw to become dull.
A: Our units run on 87 octane regular unleaded gasoline. You can use gasoline which is blended with a maximum 10% alcohol. Never use E85 or diesel fuels. Remember to use fresh gasoline and to mix it with the recommended 2-cycle oil.
Poulan suggests a ratio of 40 parts fuel to 1 part oil.
Poulan products are affordable options but still provide users with plenty of power and versatility. Plus, the Poulan chainsaws our experts listed all come with accessories to make your purchase even more worth it. If you are still considering other chainsaw brands, we also listed the best Echo chainsaw here.
STIHL 63PM3-56 16-inch Chain Saw Chain – Fits Homelite, Poulan, Echo, Remington and Craftsman.
Increase the temperature: increasing the temperature will increase the speed at which the molecules move and therefore increase the number of collisions that take place in the container.

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ANSWER : All the pictures I have of this carb show two adjusting screws.

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Idle goes up and down and the shuts off eventually
ANSWER : It sounds like the engine might be running too lean. You need to get someone to adjust the idle and high speed screws correctly.

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Rpm fluctuates idles high then low high then low
ANSWER : It could be the governor spring is weak. Get your model type and code numbers off the engine shroud and take them to your local small engine repair shop and get the new spring. It’s not hard to replace. Install the new one and you should be up and running.


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What is correct adjustment for high and low scews
ANSWER : With the saw warmed up adjust the low for best idle.Adjust the high for best speed then adjust a little richer from that point.Caution……Running at best speed (power) settings which is “lean” will 90% of the time burn the piston……thats why you go a little richer on that setting.

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How do you adjust high, low, and throttle on echo 3400 chainsaw
ANSWER : Ok, this is an easy job, and a quick tune up. First start up your saw, rev it some so it warms up. Next, make sure your saw idles, if not just turn up the idle a bit first before this. With your saw idling on the ground, turn the L screw about 1 turn either side of where it is, and listen to obtain the fastest and smoothest idle, that takes care of the L screw. Now the H screw must be adjusted while the the saw is at full throttle, turn the H screw and listen for maximum and smoothest engine speed. I sugest this be done with the chain and bar removed from the saw. After you adjust the L and H, then adjust idle to suit.

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When I start the motor it runs on high idle and the blade starts to spin without hitting the trigger… When I hit the trigger it sputters and turns off…
ANSWER : I don’t know if your saw has adjustable needles on the carb, but if it does, the “low” side needle needs to be turned counterclockwise about 1/8 to 1/4 turn. THis will richen up the idle mixture which will take care of the sputtering, and should also bring down the idle speed.

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The engine idles way too fast and will not correct with the sow speed adjustment
ANSWER : Make sure that you are adjusting the idle speed screw, not the idle jet screw (L). If you are adjusting the proper screw, then it is possible that the throttle trigger assembly in the handle has a load of sawdust/dirt that blocks proper return to idle. Take the handle apart carefully, and make notes on how the parts go back together. Check at the carburetor throttle assembly to make sure the throttle arm returns fully to the idle speed screw when the trigger is pulled and released slowly. Check the throttle spring as well to make sure it is undamaged. Hope this helps!

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What the proper carb settings for husqvarana 51
ANSWER : The initial fuel mixture settings are 1-1/2 turns from seated on each.

Set at best mixture after running,
Set Idle speed at 2500 rpm
Then for best at full throttle and not exceed 12500 rpm.
If the engine want to go above 12500 rpm enrich the high mixture a little to limit the speed.

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