Hello members, ok, so after looking at partzilla.com exploded view of the carb parts diagram, I noticed my carb is missing #16 they list as a "ring" it's the plastic piece that fits around the main jet and pushes into the pilot jet tube, my question is, do I need to order this piece (?) is it important and must be in place (?) does it have an important role in order for carb to perform correctly ? Thank you