Motorcycle 06-09 Cylinder Block Aluminum For WRF YZF YFZR YFZX 450 2S2-11311-11-00 Off-road Engine Cylinder Aluminum cylinder block designed for off-road motorcycles.Compatible with models from 2006 to 2009.Fits engine type 450 with 2S2-11311-11-00.Constructed from aluminum material for and heat dissipation.Intended for use in WRF, YZF, YFZR, and YFZX series engines.Replaces cylinder block for improved performance or restoration.