My micro xxv has been idle for several years, now I 'd like to get it going again. Do I need to do more than fresh fuel?

There should be two screws on the carb an air and fuel adjustment I always start by going all the way in then 3 full turns out and then work it a half turn each time until its right..

adjust the L screw in fully till right in,then out 1.5 turns,same with H screw.Then start saw,adjust L screw in or out slowly till you get max revs.You may need to lower idle via idle screw if revs too high.When screw cant acheive better revs,reset idle.Then,rev saw to max revs,adjusting H screw to get max revs,then when max revs acheived,turn screw anti clockwise 1/4 turn out.That gives it enough petrol to cool the tip of the plug

there is a small oil pump behind the cltch

sounds like the carb needs to be cleaned inside any fuel the was left in the carb goes bad and it never runs it all out

You do not need a manual; exactly like the video that follows:
http://www.fixya.com/support/r3706813-2_cycle_fuel_system_repair
No primer or second carburetor connection. Be kind to the oil pump; they are no longer available.

All fuel components are on the "Ignition, Electrical & Flywheel" print here (filter and hose are available):
http://www.ordertree.com/modelinfo/PWE/MICRO-XXV-Gas-Saw/75.MICRO-XXV-Gas-Saw.1.59.1.html

If you have more questions or need additional help please reply below and I will get back to you. HTH & Good Luck.
Lou
Thank You for using FixYa.

Just like the video:
Fuel Line Replacement by SmallEng.com
http://www.youtube.com/watch?v=JrXpU70Hmi0

The IPL (exploded parts list) for your saw is the only detail for fuel line routing and it is sketchy at best. Fuel components and part numbers are listed but may be on different illustrations. They are also beneficial with disassembly/reassembly:
http://www.ordertree.com/modelinfo/PWE/MICRO-XXV-Gas-Saw/75.MICRO-XXV-Gas-Saw.1.59.1.html

If you have more questions or need additional help please reply below and I will get back to you. Good Luck. HTH
Lou
Thank You for using FixYa.

Fuel/Oil Mixture

1. Use a quality 2 cycle oil and mix it to the OIL supplier's recommended ratio. Today I use Stihl 2 cycle oil mixed @ 50:1 in a Pioneer that I purchased new in 1980. There are no gouges or scratches on the piston or cylinder and I have no carbon build up on the piston top. The manual (on stone tablets) recommends 24:1. Over the years the mixture has leaned from 24:1 (Saw Recommendation) to 28:1 (Lawn boy mower recommendation) to 32:1 (Oil provider 8oz/2gal - used for many years) and finally the last 5 (±) years 50:1 (Stihl 2.6oz/1gal)
2. Any fuel containing ethanol is not good with chainsaws. Mix what you expect to use within a few months. Anything over 6 months old use up in a 4 cycle engine. HTH
   Lou

This is Poulan.com "POULAN-WEED-EATER" and your model number"Micro xxv"
http://www.ordertree.com/ARI.aspx?Mfg=75&Model=MICRO XXV Gas Saw&AFID=59

HTH
Lou

add some fresh fuel

clean out the vents on your fuel cap. you may also have sawdust or dirt stuck on the diaphragm in the carburator