13-1. FUEL SYSTEM/CARBURETOR/ FUEL PUMP/ FUEL TANK GRAND DINK 125/150 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