The Senior TT race was sensationally won by Howard Davis while competing against the works teams with a motorcycle of his own manufacture, an HRD, in 3 hours, 25 minutes, 8 seconds at an average speed of .
Howard Davis secured victory in the Senior TT race, defeating factory teams with his custom HRD motorcycle, completing the course in 3 hours, 25 minutes, and 8 seconds at an average speed of .