Hi and welcome to FixYa, I am Kelly You should have 120 PSI or greater compression. There is a ported compression release so you may see as little as 110 PSI but it is best to see 120 or greater.
The Owners manual is here:
http://www.northerntool.com/downloads/manuals/195946.pdf
carb basic settings are on page 29 of the manual.
The saw has a Zama C3-EL18 carb.
The manual for the carb is here:
http://www.zamacarb.com/pdfs/TechGuide_2007.pdf (Click and wait 2.50 mb)
Your carb is the C3
The workshop manual for the saw is here:
http://www.scribd.com/doc/8152011/Husqvarna-Chainsaw-Workshop-Manual-340345346XP350351353 (Must have a facebook account to download but can be viewed online)
Thanks for choosing FixYa,
Kelly
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