Chainsaws

hello mike, I encounter this event often with several models.  I repair/re-build saws professionally, but I don't represent Husqvarna.  thru normal use over time vibration and use of ethanol blended fuel causes cracks and degradation of the intake boot.  occasionally a tear or crack in the impulse hose is the culprit.  disassemble the saw by removing the carburetor and intake manifold with boot and all related items.  inspect the boot and the impulse hose and replace them if this is the finding.  now is a good time to remove the spark arrestor screen and torch out the carbon build-up as well.  a thorough carb cleaning is in order and make certain to replace the fuel line also.  ethanol destroys the hose and allows pieces of it to get vacuumed into the carburetor.

I have found these to be the cause.  sometimes it is only one of these issues,  once in a while it is a combination of these working  together that cause the problem.  after the cure, I highly recommend storing the saw completely dry.

I hope you kept the air filter, plug, igniter.  they are all still useable i'm sure.  if you find a crack in the boot then check condition of the piston thru the exhaust port while the muffler is off.  leaning out enough to kill the engine can cause premature loss of cylinder compression and score things up.  pour a full capful of jaso into the plugseat and slowly pull the recoil several times to distribute the oil inside the sleeve.

let me know what you find.  good luck mikey...