65 800002241 JET SPRAY CARB CHOKE CLEANER 170GR The carburetors and choke valves in small engines are especially prone to gum, varnish and dirt buildup because of less frequent use. Gumout Small Engine Carb + Choke Cleaner quickly removes these deposits from the inside and outside of the carburetor to improve engine performance and fuel economy.Cleans carburetors, linkage and choke valves.Best for improved performance, fuel economy and reduced emissions.