Description:

Inner diameter of cylinder:57.4mm/22.6",hole spacing:54mm/2.12",outer diameter of piston pin:15mm/5.9"(as the picture shows). Replacement for 4 stroke GY6 150cc 152QMI 157QMJ engine. Fits the 157QMJ engines with the EGR head,76mm bolt pattern 2 1/2" tall head. Package including cylinder head,gaskets,piston,piston rings,clips,wrist pin.