pull the slide out of the top of your carb by removing the top lid.
look at the slide and you should see 2 notches cut into it (a long one and a short one).
the long slot goes to the right side of the carb (while looking down at it while sitting on the bike). Inside the carb where the slide goes, you should see a pin on the right side. the long slot in the slide, lines up with that pin.
the short slot in the slide goes to the left of the carb and should line up with your idle adjustment screw.
i think what's happend is that you have the slide in 180 degrees off which will either give you an engine that will only idle, or wide open throttle because the slide is jammed with no throttle response at all. The side will not move with the throttle or with the idle screw when it's put in wrong. yes, the slide it will go into the carb 2 different ways, but only one way is correct.
I have found that a lot of people make this mistake and their complaint is exactly the same as what you are describing. I have no idea how many times i have given out this answer....but i'll do anything to try and help someone out.
