The Kawasaki part number 21188-2009 is a carburetor fuel shut-off solenoid designed for small engines. It cuts off the fuel flow to the carburetor when the engine is turned off to prevent backfiring and engine dieseling. Key Compatibility & Fit Compatible Engines: Frequently used on Kawasaki liquid-cooled and air-cooled engine models including FE400D, FD501D, FD501V, and FD590V series. Cross-Reference Parts: Directly replaces or supercedes OEM part numbers 21188-2001 and 21188-2004.