The cylinder liner is a cylindrical metal component that guides the piston during linear reciprocating within the engine block.In the engine, air and fuel mixture in the cylinder undergo combustion, converting thermal energy into mechanical energy; in compression applications, the piston compresses gas to increase pressure.This cylinder liner is made of cast iron and features an integrally cast Ni-SiC composite ceramic coating on the inner wall to reduce friction and support under normal operating conditions.It is compatible with CBR400, CBR23, CB-1, and CB400 motorcycles.The standard bore diameter is 55 mm.Package includes 1 cylinder liner.