scrambler 400

Hello so I need some help. I have a 2000 scrambler 400. When I bought it, it only had 60 LBS of compression so i replaced the piston and rings. Then the carb was leaking so i rebuilt the carb, and replaced the reed cage and valves. Now it that when i open the throttle up that it is getting stuck. Ill even hit the kill switch and take the key out and the bike will still be running at 3/4 open.
PLEASE HELP!