Mercury - Quicksilver 83181 Inlet Needle and Seat Mercury & Mariner 40-150HP 2-Stroke Outboards 83181. Overview. If your motor's running rich, flooding, or just not idling right, it might be time to freshen up the carb. The Quicksilver 83181 Inlet Needle and Seat Kit gives your Mercury or Mariner 40-150HP 2-stroke outboard the precise fuel control it needs to run clean and smooth again.. This factory-spec kit includes the needle, seat, and O-ring, all made to Mercury's exact tolerances. It stops