Mercury - Quicksilver Carburetor Repair Kit Fuel System Component Inline 2-Stroke 51091. Overview. If your outboard is sputtering, running unevenly, or just feels a little down on power, it might be time to give the carburetor a fresh start. The Mercury Marine 51091 Quicksilver Carburetor Repair Kit has everything you need to bring your inline Mercury or Mariner 2-stroke outboard back to smooth, strong performance. Designed for 40-150 horsepower engines, this OEM kit includes all the small but v