13. FUEL SYSTEM/CARBURETOR/ FUEL PUMP/ FUEL TANK GRAND DINK 250 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 Air Cut-off Valve Cover AIR CUT-OFF VALVE (A.C.V.) A.C.V. REMOVAL Remove the two screws and the air cut-off valve cover. Screws Diaphragm Remove the spring, diaphragm and O-rings. Inspect the diaphragm and spring for wear or damage. Cover Spring 13-12