Check my last post from this thread, where I wrote just 10 min ago.
http://www.xt660.com/showthread.php?t=20919
I'm not an expert, but I think that the gas just disappeared, and now I only ride on the spring. I ordered complete new shock from Wilbers for 420 euro. But if you are somewhere in Europe, than I guess there is an option of rebuilding the stock shock, is there?
Sent from my GT-I9100G