Basically this is what you have to do. It's not that hard if you've never done it before, but it does take a little time and patience.
first thing you need to do is get a milk crate or something to lift the bike up on. then start it up and run it for a minute or two. it's a little easier if you have another pair of hands to help with the throttle but if not, you can give it gas from the throttle plate on the carb with your left hand and adjust the needles with your right. once it's warm, start with the high speed needle. give it full throttle and turn the bottom screw in finder tight, until it starts to sputter and die out, then back it out again a few turns until it sputters again. do this back and forth a few times to find the "sweet" spot. you'll know when you find it. then while running at idle, turn the side needle(low) in finger tight until it starts to die out, then back it out again like before, until it dies out again then back in again until it runs smooth. you do the low speed one without the throttle! then when it's running the way you want it, take it for a ride because you may have to do a littlew more adjusting when you put load on it! after a few times doing this, it becomes second nature to you!!! good luck and let us know how you make out or if you need anymore help!