We first saw Showa’s Separate Function Fork (SFF) on the 2012 Kawasaki KX250F. Here is the second generation of the SFF unit on both the 2013 Suzuki RM-Z450 and RM-Z250. The right leg contains the spring and the left leg contains the cartridge assembly, which tackles damping. The diameter of the fork inner tube has jumped up from 47mm to 48mm for 2013, which Suzuki says optimizes stability and absorption performance. Going with the SFF fork also lightened up the Suzuki 450 by two percent.