take the carb off.
Unscrew the top screws on the carb and pull the slide out.
pull up the spring back so you can see down inside the slide. there are 2 screws down there. Take them out and you should be able to get the needle out.
There is a c-clip on the needle. If you raise the c-clip to the next position it drops the needle and will lean out the bike at mid-ish throttle. Moving the c-clip down the needle with raise it making it richer.
If it feels super rich at mid throttle, raise the clip 1 position at a time until it feels nice and crisp.
Good luck spanking that shee!