A "choke" spring? There is a spring going from the cold start to the "accelerator" inside the pump,.. on pumps with the increased RPM tied to the cold start lever. The extra stuff on the back of some pumps. Otherwise there is no "choke" or springs connecting the cold start to the levers inside.So you removed the limiting collar? That will just allow you to have more rpms hang as it allows even more adjustment in that direction.