trial the machine Pickrell rode a Dunstall Norton during a regular sprint meeting to set a new national record for the 750 cc flying'' quarter-mile at at Elvington airfield-runway in Yorkshire. There are no records of Dunstall's organisation competing during 1970, his regular rider (of two-and-a-half seasons) Ray Pickrell riding for Norton Villiers in 1970, then BSA Triumph in 1971 and 1972 Dunstall's shop manager and former regular rider Rex Butcher entered the 1968 TT on a Triumph References Dunstall Sport bikes Motorcycles powered by straight-twin engines