Turning the pilot screw anticlockwise should richen the idle mixture slightly. Because it is a 2 stroke, I suggest you adjust the pilot screw for the best idle quality you can get, ensuring it is running at idle speed when you make the adjustment. (As the speed rises, the main jet begins to contribute to fuel supply as well, so the slower you can run it when making this adjustment the better.)
Remember, this is a 2 stroke. They don't idle well, but some are a lot better than others. If you are able to find a pilot screw position that gives the best idle quality, and it deteriorates when you turn the screw either way, all is well. Don't expect it to make a big difference, though: it isn't like a whipper snipper or chainsaw carburetor where each of the screws (H and L) tunes up sharply like a short-wave radio. The pilot screw has a very small effect because it is in series with a small jet and a small air bleed orifice.
