12. CARBURETOR VITALITY 50 AUTO BYSTARTER INSPECTION Check the auto bystarter valve and needle for nicks, wear or damage. If any faulty part is found, replace the auto bystarter with a new one. Bystarter Needle Bystarter Valve Screws Screws AIR CUT-OFF VALVE (A.C.V.) REMOVAL Remove the two screws and then remove throttle cable holder. Remove the two screws and the air cut-off valve cover. Throttle Cable Cut-off Valve Cover Spring Cut-off Valve Cover Remove the spring, diaphragm and O-rings. Inspect the diaphragm and spring for wear or damage. O-ring Diaphragm 12-21