I believe they are doing it with all their carbs now (onroad engines). I do have a pretty simple solution if you have problems getting the carb to close consitantly. I had constant problems with that and what I did was to replace the small set (grub) screw that holds the ball end onto the slide. I use a pan head screw instead. I use a rubber band on the ball end and a second rubber band around the pan head screw. What it does is even out the pressure on the slide so the slide doesn't bind. Now it closes consistantly.