... clean PVC valve, ERG valve, increase combust Captain Carburetor Cleaner, Carb Cleaner, can effectively remove greasy dirt, gum, and carbon deposits ... cartons AUTOMATIC CHOKES: While manually opening and closing choke, spray on both ends of the choke shaft. If not ... take choke cover off and start engine. While running, spray into vacuum cylinder.CARBURETOR LINKAGE: Flush oily carburetor linkage with ...