[gf101]

I have a Santa Cruz Carbon Blur XC that Ive just installed a used Ario 2.2 w/LO on. It is installed "upside down" from what would be considered the conventional orientation, i.e. the schrader valve is at the low end. I previously had this shock on a Gary Fisher Sugar without any issues. The shock tops out very harshly when it returns to the full extended posistion. Hard enough that it will produce a pretty solid knock. I tend to run it pretty firm for my weight (140lb) and rebound damping set at approx 80% of fully fast. Any thoughts? THX

 

[d-bug]

Sounds like air in the damper, weak negative spring, topout bumper is inadequate, or rebound is set too fast.
You could try and remove and reinstall the air can to recharge the negative spring.
While you have the air can off check the shaft to see if there is a topout bumper and it's condition.

I recently got a new shock and it had a bad topout feel. The fix was to put in a larger topout bumper, which s basically just an o-ring.