After many years of careful collecting, Crussell has assembled an essentially vertical collection of Kawasaki GP bikes spanning from a 1968 A1R to a 1978 KR750. Crussell says his collection traces two distinct lines of Kawasaki racebike development, one starting with the ’68 A1R (250cc two-stroke parallel twin), then continuing with a ’69 A1RA, a ’70 H1R (500cc two-stroke inline-triple), ’71 H1RA, and ’75 H1RW. The second line begins with the 1972 H2R, a descendant of the H1RA but with a 750cc two-stroke inline-triple. Crussell also owns ’73 and ’74 variants with minor frame and engine improvements, as well as the ’75 KR750 that introduced water-cooling, then the final version, represented here by the ’78 KR750. Together these machines document all of Kawasaki’s chassis and engine racing development during that period, Crussell says.