This is the Crankcase for the OS Max 46 AX engine - OSMG0547. FEATURES: Aluminum construction INCLUDES: One crankcase REQUIRES: None, item is a stock part. SPECS: Width: 35mm (1.38")width of engine neglecting engine mounting flanges 44mm (1.73")distance between centers of the mounting holes COMMENTS: This Part Houses All the Engine Components. kpm03/16/2004 ir/jxs