but returns to a perfect idle.
Chain Saw 20″ Bar

Experienced gardeners share their insights in answering this question :
Sounds like dirty carberator or carb needs adjustment. How is the spark plug?

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Because the air doesn`t enter the engine in a controlled or consistent manner, it will cause the RPMs to surge up and down depending on how lean the mixture is at any given moment. This can cause serious engine damage because of a lack of lubrication.
If your chainsaw still starts and then stops working, check the air filter. Clean or replace the air filter if it is dirty or damaged. Another reason that your chainsaw starts and then stops working could be that the spark arrestor is dirty or clogged. If this is the case, clean it with a wire brush.
Over time, the spark arrestor can become clogged with soot. If the spark arrestor is clogged, the chainsaw may run roughly. To unclog the spark arrestor, remove it and clean it with a wire brush. You can also replace the spark arrestor.
If the filter becomes clogged, not enough fuel will reach the engine for it to run properly. Because your chainsaw will idle, but dies when it is revved up to full power, it means that the filter is only partially clogged; it will allow enough fuel to the engine to run on idle, but not enough to sustain full throttle.
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.
Plugged Fuel Filter (fuel)

Old or poor quality gasoline along with sawdust and dirt can plug the filter in the gas tank. If your saw isn`t getting enough gas, remove and clean or replace the fuel filter.

Most chainsaws idle at around 2,800 to 3,200 revolutions per minute, or RPMs. At this speed, the crankshaft continues to spin, but the clutch doesn`t. When the trigger is pressed and the engine speeds up, the force pushes outward on the clutch.
The two most common reasons a chainsaw won`t idle are a blocked air filter and an idle screw out of adjustment. Other possible causes include: Dirty Air Filter. Idle Screw out of Adjustment.
Turn the idle screw to adjust the idle—turn the screw to the left to increase the RPM or to the right to lower it. When you have adjusted the idle—aim for 650 RPM—reconnect the idle air adjustment valve`s electrical connection. Lower the hood and turn your car off.
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.
The most probable – and easiest to fix – cause of chain rotation while the chainsaw engine idles is a poorly adjusted idle setting on the carburetor. The result is that too much fuel is delivered to the combustion chamber when the throttle is released, and the engine doesn`t really slow.
There could be various causes: incorrect fuel mixture, carburation not calibrated properly, or a wet spark plug. In spite of their power and robustness, chainsaws are actually rather delicate machines that require careful and precise maintenance at every stage of their life cycle.
There are three main reasons for a chain to come off: Incorrect bar and/or chain for the saw; check to be sure that you are using the proper chain pitch, gauge and number of drive links to match the guide bar. Chain not properly tensioned; It is normal for a new chain to stretch and require frequent adjustment.
Most chainsaws idle at around 2,800 to 3,200 revolutions per minute, or RPMs. At this speed, the crankshaft continues to spin, but the clutch doesn`t. When the trigger is pressed and the engine speeds up, the force pushes outward on the clutch.

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Husqvarna 385 I have a husqvarna 385 saw. It starts good, idles good, but as soon as you rev the saw it starts to cut out and runs very rough. but returns to a perfect idle.
ANSWER : Sounds like dirty carberator or carb needs adjustment. How is the spark plug?

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I used my brand new Husqvarna chain saw for about 30 minutes then when I pinched the blade a little bit and it kicked back out at me, the chain stopped moving. I can’t even turn it by hand. The engine runs but you can tell it run wide open. and the gear that runs the chain doesn’t move either. Please help.
ANSWER : The chainbrake has actuated, you need to pull the hand gurd fully toward the rear of the machine until you hear the click of the brake unloading.

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It starts and runs for a bit but as soon as it hits thicker grass it dies
ANSWER : Joe Hi there. Sadly your trimmer will struggle on thick grass as it’s not made for it. You could try moving the trimmer like a scythe. This will aid it as your cutting bit by bit.

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I’m having problems with my 223L when I cen get it started I have to run it with full choke once you open the choke it shuts down any help Please
ANSWER : Sounds like its getting fuel starved, look at fuel system and carb settings, may need a carb service.

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Cannot get the saw started – Husqvarna 450 e-series 18" Chain Saw
ANSWER : Check for spark check fuel filter carb kit if sitting for while new plug

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Husqvarna Model 136 chainsaw will only run for a short time with choke closed. Engine quits shortly after choke is opened.
ANSWER : Take apart the fueling system and carb. Something is blocking or gummed up. One thing that sometimes works is to remove air filter, rev the unit up, and place hand fully over the intake, and remove before unit stalls. This sometimes will clear the blockage.

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If your crank seals are bad will this cause your saw to rev up ,,it sounds as if it is sucking air some place,,the carb is good,manifold is good,,fuel line is good ,,manifold clamp is good and the short hose underneath ,,,this is a 350 husqvarna ,, starts and you have to pull the choke 1/2 out for it to keep running ,,push the choke in and it revs right up to 10,000 rpm or so ,,,wondering if i bought sealed bearings if would need crank seals to ? i have torn this saw apart 3 times and put it back together with the same results HEEEEEELLLPPP
thanks andrew
ANSWER : Bad gasket under carb….

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Husqvarna 345e Hard to start and when it does start it continues to run (chain).
ANSWER : I have a model 435 Husky that had the same hard-to-start problem–warranty service replaced the carburetor and it seems to work ok now. The chain that continues to turn can be fixed by turning the idle-speed screw (not the H or L jet screws) CCW a small amount until it can be accelerated then dropped back to idle to quit driving the chain. Hope this helps!

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