I remember when I jetted my quad, there was a small white plastic disc on/behind the main jet. I remember having to remove the jet to remove the small white plastic disc, it seemed to be held in place by the jet. I also remember when I put in the new jet it seemed to slip over the jet and not stay in place. I positioned it, then installed the bowl, and proceeded to ride with no problems. I decided to check it today, and when I removed the bowl the small white plastic disc fell out. So, again I positioned it, and reinstalled the bowl. Should I be concerned about it? What does it do? Should I replace it? Am I doing something wrong?