So, I had a stuck needle, which caused a fuel leak, which caused a engine fire, long story short, I ipened up the carb, cleaned it and replace all the components in the kit, but as I found out tonight I left this black plastic peice out, to be honest I put it off to the side and forgot. What does this do? Do I need it? Should I put it back in place, she seems to run fine without it, but don't want to cause a problem later on down the line for something so small and easy to put back in. Your help is greatly appreciated.