The highest number of entries to date, one hundred and forty seven, were received for these races.
The 350cc Junior TT was won by H.Mason 2¾ hp NUT-Jap motor-cycle and the 500cc Senior TT Race by Tim Wood with a chain-driven 3½ hp Scott machine.
[1] While leading the Senior TT race, Frank Bateman, riding a Rudge crashed fatally on the fourth lap below the Shephard's Hut near to Keppel Gate.
[2][3] Continental entries for the Senior TT race included E. Vailati (3½ hp Rudge) from Italy, K. Gassert (3½ hp NSU) from Germany and a Russian entrant M Kremleff also riding a Rudge, but he retired after crashing.
[6] Wednesday 4 & Friday 6 June 1913 – 7 laps (262.50 miles) Isle of Man TT Mountain Course Fastest Lap: H.O.