Reminds me of a joke..
How do you tell if a politician is lying.....
His lips are moving!!
The WE Air shocks on the two front skis and Center shock should be serviced every 1000 miles IMO...
Also the rear track shock... take the IFP pressure up to 210lbs as well.
Service includes change clean, change oil, inspect all parts, repairs if necessary and recharge with 225lbs of nitrogen.
They should be recharged every season, IMO, Regardless of if they have been serviced... there is no way to check the pressure alone... a recharge is quick and easy by anyone that does this service.
If you have a soft skid... have them serviced, including the rear track shock.
For the Average mountain rider the WE Air shocks are sufficient... but they do need maintenance to perform.
Also, I Highly recommend the Skinz Protective Gear WE air neoprene shock boots to protect the shafts... they nick VERY easily and are suceptible to damage. The front-track shock already has a boot.
If you are removing the shocks from the sled... wrap the shafts with foam pipe insulation or rags/tape... just bumping into the a-arms on removal can nick the shafts.
If you have 2007/08 WE airs... I would recommend sending them into Walker Evans Racing or Fastrax for updates to the 2009 Valving specifications for a bump in performance.
www.ftxmotorsports.com