They are among the sturdiest link systems out there, and sealed very well. They are not the eaisest to work on, however. To make reassembly eaiser, loosely fasten the frame brackets and pull rods to the main link on the bench. The brackets fit very tight between the swingarm and engine cases, and if left loose you can tap them around with a rubber mallet to line the holes up. Antiseize on the surfaces makes things eaiser too. Then install the swingarm pivot and frame bracket bolts, and torque everything down. Do the lower shock mount next and swingarm pull rod mount last.
Glenn
'00 GasGas XC250