Originally posted by gremlins2g
I used an oring that was for the saito idle needle. The stock one was much to loose , didn't hold a setting and leaked air. The Saito ring fits very snugly in there and holds very well.
That's good to know, what size engine needle valve o-ring did you use.
My Irvine's seem to fit OK. Some of them seem to get soft and mushy though and like you say won't hold a setting.