The Echo A021003661 Carburetor RB-K106 helps deliver the proper fuel-and-air mixture for smooth and consistent engine operation. It regulates fuel flow into the engine to support reliable starting, steady idling, and responsive performance. By providing an appropriate mixture of fuel and air, it helps promote efficient combustion and consistent power during operation. As a replacement... https://www.wholetoolbox.com/echo-a021003661-carburetor-rb-k106/A021003661.html