ine is not stopped up from tank to carb. less than 2 yrs old.
seems to be firing but, won’t run.
“Chain Saw – 16” Bar, 3 Hp

Experienced gardeners share their insights in answering this question :
Sounds like the diaphragms in the carburetor have gotten dry and won’t flex anymore. Install a new kit in the carb and recalibrate the screws. You should be good to go.

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If the spark plug produces a spark and you are still having difficulties starting your chainsaw, it`s time to check the gap. The spark plug gap is an air gap between the ground electrode and the center electrode. If the gap is too small, the spark struggles to ignite the fuel and air mixture.
SPARK PLUG GAP: 0.5 mm (0.020 in.)
If you have an electric chainsaw that won`t start, first make sure that the power cable is connected to the mains, then check whether the cable and plug are damaged. If they aren`t, the problem could lie in the motor which, for example, may have worn or damaged brushes.
Correct Gap

The gap between the spark plug`s center electrode and outer electrode should be set at 0.02 inch, or 0.5 millimeter, for most Husqvarna trimmer models. On some newer models, the company recommends a slightly larger gap of 0.024 inch, or 0.6 millimeter.

If it is difficult to start the ride-on mower, the most common reasons include: Old fuel; make sure to use fresh fuel, especially after winter storage. Spark plugs might be dirty or damaged. How to examine and replace a spark plug on your ride-on mower.
Smart Start is one of Husqvarna`s unique technology because when their chainsaws are installed with it, it means it`s extremely easy to start.
Typically, we recommend a break-in period of six to ten tanks of fuel. During this period, the engine should not be allowed to run at a high rpm for extended periods. Was this article helpful?
Typically, we recommend a break-in period of six to ten tanks of fuel. During this period, the engine should not be allowed to run at a high rpm for extended periods.
Typically, we recommend a break-in period of six to ten tanks of fuel. During this period, the engine should not be allowed to run at a high rpm for extended periods.
Remove the spark plug, dry it, crank over the engine a few times to dry the cylinder. Now refit the plug and try again. Set the switch to “On”, set throttle to fully open, set choke to “Off” and crank over the engine. Expect the saw to start on the second or 3rd pull.
If your chainsaw does not start, the fuel may be too hot. To prevent this from happening, always use fresh fuel and reduce your operating time when the weather is warm. If your chainsaw will not start, place it in a cool area away from sunlight for at least 20 minutes.

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Husqvarna 137 chain saw – put a new plug in and won’t start run if you put a small amount of gas in plugfor just a second or so made sure gas line is not stopped up from tank to carb. less than 2 yrs old.
seems to be firing but, won’t run.
ANSWER : Sounds like the diaphragms in the carburetor have gotten dry and won’t flex anymore. Install a new kit in the carb and recalibrate the screws. You should be good to go.

I have a husqvarna 323L string trimmer. I stored it after running the tank & carb dry for about two years. I fueled it, then started it, & it ran for a minute then died like I turned the switch off. Since it would not restart, I found the fuel filter had broken off the hardened fuel line & it sucked gummy crap out of the tank & into the carb. Failing at cleaning the carb, I finally put a new carb on it & replaced the pump, hoses & filter. It has ran good till this year. I winterized it with stabilizer & left it with a full tank over the winter. The gas in the tank was gone when I got ready to use it this year. I filled the tank with premix, checked for leaks, then started it. It would run fine for about half a tank, start idling poorly (lean) then cutoff & refuse to restart till I refilled the tank. I finally found the tank had cracks & was letting pressure out of the tank & apparently this was causing the carb to lose it’s ability to siphon gas out of the tank. So I replaced the tank which came with new hoses & a filter, which I properly installed to the carb. It cranked right up, but when it runs a half tank, the carb quits sucking gas out of the tank. When I pump to prime the carb, it moves the fuel into the carb, but the pump never gets hard like it does when I prime the carb when the motor is cold. I have to keep refilling the tank, prime, & then it starts & runs until the tank gets about half empty. The new fuel filter is down in the gas tank properly, but It will not run after it shuts off until I refill the tank & prime. I’m baffled. New tank, new hoses, new filter, new carb, & I can find no leaks in the fuel system. It runs strong. The 323L is a two-stroke & it always cranks on the second pull from cold on a full tank. Any ideas?
ANSWER :

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.

Chainsaw stalls Chainsaw is 4 years old and has a history of moderate use. After I ran the saw about 1 minute on plain gas (grabbed the wrong gas can – ouch) the chainsaw sputtered and stopped.

It didn't seize, and the pull starter never became more or less difficult than normal. The engine would continue to start if I pressed the prime bulb and engaging the choke, but stall again after 10-20 seconds. The temperature that day was about 50 degrees F and I was running the saw with the “cold plug” installed (per warm weather running).

When it refused to keep running I did the following:
Flushed the fuel tank (that's when I saw the gas had no oil in it).
Ran hardware wire through all of the fuel lines.
Replaced the fuel filter and spark plug.
Cleaned the air filter with a nylon brush and compressed air.

Same behavior (start then stall in less than 20 seconds). I made at least 20+ attempts to start it.

I removed the carburetor and, though it looked perfectly clean, I took off the top and bottom covers then sprayed everything with automotive carb cleaner and blew out the passages with compressed air. The gasket and diaphragm looked new. No pinholes in the diaphragm when held against a bright light. I reinstalled the carb but got the same behavior (start then stall in less than 20 seconds). I again made at least 20+ attempts to start it.

I disassembled the short block and saw that the piston has some slight scoring on it. The ring is clean and I verified that the piston ring has .001 clearance between it and the piston ring groove all the way around with the ring held tightly in place (I was thinking that the piston might have become deformed if it did indeed get too hot when run without any oil premix).

The cylinder wall has no scoring and there isn't any signs of melted aluminum anywhere. The crank is clean as was the inside of the crank cover.

I reinstalled the crank cover using permatex non-hardening gasket goop and torqued the cover bolts to 10 inch pounds. I reassembled everything else per the exploded diagrams in Echo's “parts manual” for the CS400.

During assembly I took note that both the carb gasket and intake boot look like new.

Still the same result: press prime bulb once, engage choke, pull a few times and it starts but stalls after 10-20 seconds.

I'm stumped.

ANSWER : Not sure what to say other than its fuel starvation, if not already done replace the fuel filter in the tank, if no better i would suspect a massive air leak, so replace the crank seals, if there is no primary compression in the crankcsae fuel will not pull through the engine, good luck.

Husqvarna 350 geting fire and gas but wont start
ANSWER : Have you tried cleaning the air filter? The carburetor fuel inlet may have screens plugged with sawdust as well. If you have spark and fuel and AIR you should get fire(combustion)Frank

I have a 266 se husky saw and I can not get it to start, there is spark and fresh fuel in the saw, I have put a kit in the carb and the saw will fire but stop, it appears to flood with fuel after a short period of time while attempting to start it.The saw was running fine until the carb came loose on the barrel but I have been unsucessful at getting it to run since I have replaced the gasket between the carb and cylinder.
ANSWER : It probably damaged the diaphram when the carb came loose. you could try adjusting the carb. that will solve it every once in a while.

Can’t keep pole saw running. It starts fine but when i go to do something it shuts down
ANSWER : It sounds to me like you have a blockage in the high jet. There are 2 jets in the carb a HI and a LOW. If you can determine which is the high jet turn it in gently while counting how many full turns and any partial turn and write it down. (example 2 and one half turns) Then remove the high jet needle valve. Spray some carb cleaner into the hole you took the needle valve out of using the little tube that comes with the can of carb cleaner. then put the needle valve back in and turn it gently till it stops again. Now turn it back out the same amount that you wrote down. It would not hurt to do the other jet as well…

SAW WONT START IT HAS FIRE TO THE PLUG AND IT WONT START WHEN I SHOOT A LITTLE ETHER IN IT
ANSWER : If the engine has good compression, and good spark, it should at least ‘pop’ several times. Check the flywheel ‘key’ as it may have sheared causing the ignition to be out of time. Hope this helps!