2 ideas, 1) Did you attach the throttle cable to the slide properly? If not the cable goes down through the center of the spring and cable retainer and hooks to the slide, then the spring with the cable retainer is lowered into the slide, note there usually is a protrusion on the retainer ring that fits into the same notch the cable slid into, this prevents the cable from coming unhooked from the slide. 2) Did you install the slide into the carb. properly? I think your slide has a notch that must be aligned with a protrusion in your carb. in order for it to slide all the way to the bottom of the air inlet.