The rolling chassis of this bike was ridden by Dick Hammer at Daytona in 1969, he finished 12th in the 250cc class race. The bike has been upgraded to a 350, with a A7R engine, which itself has been upgraded with the A7RA carbs and pipes.
In 1967 Kawasaki introduced the A1R. With continuous development of the Yamaha twins these machines needed an upgrade to become competitive. In 1969 Kawasaki introduced the A1RA at Daytona with a very impressive works team including Dave Simmons, Cal Rayborn, Art Baumann, Walt Fulton and Dick Hammer. The A1RA featured an upgraded frame (a predecessor to the H1R), a dry clutch and revised carbs (30mm sand cast Mikunis) and expansion chambers. The A1R rear wheel was retained, the front upgraded to either a Ceriani or Fontana, later in the year using the H1R drum.