<Ul> <Li> 501--600 cc, 4 stroke, 4 cylinder, Production based motorcycle engines . </Li> </Ul> <Li> 501--600 cc, 4 stroke, 4 cylinder, Production based motorcycle engines . </Li> <P> For the 1911 Isle of Man TT, the first TT event using the Snaefell Mountain Course or Mountain Course, two separate races were introduced . The first event was a four lap Junior TT race and a separate Senior TT race for 500 cc single - cylinder and 585 cc twin - cylinder motorcycles, over five laps of the new 37.5 - mile (60.4 km) Snaefell Mountain Course . The new technical challenges of the Mountain Course forced changes on entrants and motorcycle manufacturers alike . The American Indian motorcycle factory fitted a two - speed gearbox and chain - drive . This proved to be the winning combination when Oliver Godfrey won the 1911 Senior TT race riding an Indian at an average speed of 47.63 mph (76.65 km / h). Fitted with a six - speed belt drive Charlie Collier riding a Matchless motorcycle finished second in the 1911 Senior TT race and was later disqualified for illegal refuelling . During an early morning practice session for the 1911 Isle of Man TT races, Victor Surridge died after crashing his Rudge motorcycle at Glen Helen, the first death of a competitor on the Snaefell Mountain Course and the first death in the Isle of Man of a person in an automotive accident . </P> <Dl> <Dd> <Ul> <Li> 1911 For single cylinder motorcycles not exceeding 500 cc engine capacity and 585 cc twin cylinder motorcycles . </Li> <Li> 1912--1939 For motorcycles not exceeding 500 cc engine capacity . </Li> <Li> 1947--1948 For motorcycles not exceeding 500 cc engine capacity and a ban on engine supercharging . </Li> <Li> 1949--1976 FIM World Championship event for motorcycles not exceeding 500 cc engine capacity . </Li> <Li> 1977--1984 for motorcycles not exceeding 500 cc engine capacity . </Li> <Li> 1985--2004 for motorcycles complying with ACU TT Formula 1 rules not exceeding 1,010 cc engine capacity . </Li> <Li> 2004 onwards for motorcycles complying with ACU / FIM Superbike rules not exceeding 1,000 cc engine capacity . </Li> </Ul> </Dd> </Dl>

Who won the isle of man tt senior race