(moving it toward the pointy end) raises the needle, making the mid-range richer .

On the Mikuni BS26, the pilot screw is usually located on the bottom (engine side). Leans the mixture (less fuel).

This is the most common failure point. The orifice is tiny; use a dedicated carb cleaning wire or compressed air. Never drill it out.

Once the carburetor is reassembled, manually push the slide up with your finger and release it. It should fall with a distinct "thump" and a slight delay. If it falls instantly like a rock, the diaphragm isn't sealed correctly, and the carb won't function under load.