The Motorcycle World Championships were first held in 1949, a year before the beginning of the four-wheeler Formula One World Championship. Les was the first winner of the prestigious 500 cc class, riding an AJS Porcupine. The Championship began with Graham leading by 90 seconds in the 1st round, at the 1949 Isle of Man TT. With only a few miles to go, the magneto drive sheared and he pushed home to finish 9th. He won round 2 at Bremgarten in Switzerland and set fastest lap (in year 1 fastest laps counted for 1 point). Round 3 was the Dutch TT where he finished 2nd to Nello Pagani. He failed to finish in round 4 at Spa in Belgium. Round 5 was the Ulster Grand Prix in which he was victorious and collected the fastest lap. The final round was held at Monza in Italy where local hero Nello Pagani on a Gilera won. A rider's best three finishes counted. Graham had 2 wins & a second, Pagani had 2 wins & a 3rd. Graham took the title even though Pagani's overall score was higher.