 Devlins (Donald Sutherland (I) (qv)) motorcycle is a 125cc Royal  Enfield Flying Flea. Two Flying Fleas were on set but neither being  very reliable, a 125cc Yamaha engine was fitted into the Royal  Enfield frame and was used in some shots with the Flying Flea engine  noise superimposed. For the viewer to tell them apart, when  Sutherland uses the hand gear change, its the Flying Flea engine;  when he uses his foot to change gear, its the Yamaha engine.