This is the replacement Cylinder and Piston assembly for use with the O.S. .21 XZ-B ABC ENGINE (OSMG2050) FEATURES: Newly designed liner ports for increased torque at low to mid speed ABC construction, "A"luminum piston with "B"rass liner that is "C"hrome plated four port cylinder
INCLUDES: One cylinder and piston assembly for the O.S. MAX .21 XZ-B ABC Engine SPECS: Bore: 0.543" (13.8mm)
