Caption:

Sheene's superbike outings were given a much needed tonic when

the ageing road-based TR750 Kettle was pensioned off and replaced by stretched versions of the RG500 square-four GP machine. The 535 prototype was the work of Frank Sheene and long-serving mechanic Don Mackay and debuted at the end of 1976. Barry is pictured at Brands in 1978 on the factory RG700 is spawned.