12. CARBURETOR VITALITY 50 CARBURETOR BODY CLEANING Blow compressed air through all passages of the carburetor body. · Make sure that no fuel jet is clogged. Spring Cut-off Valve Cover Install the O-ring onto the air-cut-off valve body securely. · Install the O-ring with the flat face toward the valve body side. Install the diaphragm, spring, and cover. O-ring Diaphragm Screws Screws Install and tighten the two screws attaching the air cut-off valve cover. Install the throttle cable holder and tighten the two screws. Cut-off Valve Cover Throttle Cable Holder 12-22