 †† The Sidecars and 125cc races were held on the 10.6-mile (17.364) km long Clypse Course other than the usual 37 mile (62 km) Snaefell mountain course.Points were awarded to the top six finishers in each race.Only the four best races counted in the Sidecars, 125cc and 250cc, while in the 350cc and 500cc championships, the five best results were counted.