Here is how you access the needle clip. On the exterior of the carb is a top plate where the throttle and choke cables go in. There is one screw in that plate. Remove the screw and lift it off, with the cables still connected. There will be 2 brass cylinders that the cables plug in to, 1 big (the throttle cable) and 1 small (choke). Undo the throttle cable and remove the brass cylinder, which will have the needle protruding from the bottom. Inside the cylinder is a "W" shaped clip, which holds the needle in place. Use needle nose pliers to remove said retaining clip, and pull the needle from the brass cylinder. On the top of the needle is a very small clip. Use the pliers and gently remove the clip and replace it on which ever notch gets your noped running best. Like I said, mine is running best on the 2nd from top. The closer to the top, the leaner it will run, and farther to bottom the richer. I think stock is 2nd from top? Make sure you dont lose the small clip, or the retaining clip, or the spring. Reassemble in the reverse order. Thats all!