O.S. Engines 25603010 Cylinder and Piston for .46 FX Engine This is the Replacement ABC Piston and Cylinder (aka sleeve or cylinder liner) for the O.S; .46 FX engines This is the Replacement ABC Piston and Cylinder (aka sleeve or cylinder liner) for the O.S. .46 FX engines This is the Replacement ABC Piston and Cylinder (aka sleeve or cylinder liner) for the O.S. .46 FX engines