slide is mirrorlike, needle looks good too
Not sure on 85-86, but all 87-92 250's and 87-90 500's have a black coated slide. If the black is worn off it is junk. I'm not talking about the needle, the needle jet. The the needle slide's into it and the main jet threads into the bottom. They will wear out, if so it's very difficult to get it to idle and start.