ZENOAH G320RC 4 BOLT TOP END KIT 31.8CC 38MM Zenoah G320RC 4-Bolt Top End Kit 38mm 31.8cc 967319401 Complete top end rebuild kit (repair kit) for the Zenoah G320RC Engine. This repair kit includes parts shown - Cylinder, piston, ring, gasket, snap rings, piston pin, pin washers, transfer port covers, port cover bolts Zenoah Part # 967319401 Piston pin bearing not included. See ca296 in related items below