Gz250 wont take throttle

[blue06gz250]

I have an 06 GZ250 that wont take throttle after having the carb cleaned. The slide moves in the carb but very slowly. If i start it with the choke on it will idle fine and idle without the choke on. When I take the choke off and try to give it throttle it will die. I have had the carb cleaned at least 5-7 times and no luck. My mechanic thinks that the slide not moving like it should is the problem but not completely certain. Any help would be appreciated.