The FA-180B is a remodelled version of the FA-180, the only parts that have changed are the Cylinder, Crankcase, Cam gear housing, and Engine gasket set.
The FA-180B has the same mounting dimensions as the popular FA-120 and FA-150. The only increase is an extra 2mm on the height of the rocker cover, so it will fit straight in most 1.20 size models.
