Ported 1050 cylinder with 3 hours on new pistons. Includes 47 cc oem redesigned head and raves. Also has wrist pin bearings and head gasket. Everything you need to bolt up and go. Pistons are 91.99 mm. I have two other sets of used piston i'll include if you want. Both extra sets have less than 10 hours on them. $1000 obo