I have an old SuperTiger 46, probably purchased in the late 70's or early 80's. I need a new high speed needle valve. Are these parts still available? If yes from who? Any help would be appreciated.

If your high-speed needle looks like a thick wire bent over at one end and threaded and sharpened at the other, SuperTigre no longer makes it. Harry Higley does make one, though, and you can order it through your favorite hobby retailer.