At the 1939 Ulster GP, the last GP before the War, the two bikes led from the start against Nortons and a supercharged four-cylinder Gilera, but halfway round the first of the  laps, already timed at  on one section, A R (Bob) Foster retired with plug trouble.
At the 1939 Ulster GP, which was the final race before the War, two bikes were in the lead against Nortons and a supercharged four-cylinder Gilera from the start. However, halfway through the first lap, already timed at , A R (Bob) Foster had to retire due to engine issues.