 A fall at the 1953 French Grand Prix at Rouen in the 350cc class broke a collar-bone and brought about a premature end to championship ambitions for Amm for the 1953 Grand Prix motorcycle racing season.However, Amm returned to the abortive Norton Kneeler project in November 1953 to set a number of world speed records at Montlhéry, France rasing the hour speed endurance record to a distance of 133.70 miles.Also at Montlhéry in November 1953, Amm shared a streamlined Norton Sidecar outfit with Eric Oliver to set further speed records.