Motorcycle Cylinder Block 96mm For CRF450R 2004-2008 Aluminum Engine Parts Standard Bore 12100-MEN-670 12100-MEN-671 Aluminum cylinder block designed for use with CRF450R models from 2004 to 2008.Features a standard bore size of 96mm and is engineered to meet specifications.Compatible with part numbers 12100-MEN-670 and 12100-MEN-671.Constructed from aluminum for reduced weight and efficient heat dissipation.Intended as a replacement component for engine rebuilds or performance.