Models covered: V9A1 88.5 cc Vespa 90; V9SS1 88.5 cc Vespa 90 Super Sport; V9SS2 88.5 cc Racer; 2322L22 123.4 cc; VMA1 121.1 cc Vespa 125; VMA2 121.1 cc Primavera; 312L2 145.45 cc Sportique; VBC1 145.45 cc Vespa Super; VLA1 145.45 cc Vespa GL; VLB1 145.45 cc Vespa Sprint; VSD1 180.69 cc Rally; VSE1 197.97 cc Rally 200 Electronic; all rotary valve models, from 1959 onwards.