I have a 2003 ds650 and had to buy a new carb. Installed the carb and it only ran on choke. Then I took out the jets in both carbs and put the old ones into the new carb. Idles great but not the slide will not move. When I press the throttle the slide bounces a little then the engine dies. If I hold my hand over part of the air side of the carb the slide moves and the throttle response is great. I have triple checked the slide diaphragm and even checked it by blowing air into it and the slide moves great. I'm at a loss at what is causing the slide not to move even with the airbox all set up.