and stroke are 64x54 mm. It produces 30.4 ft·lbf (41.2 N·m) of torque at 7500 rpm. Coming out in 1983, it was the evolution of Yamaha 's popular and well known RD350 (1972-75) and RD350LC (1980-82). Production was carried on into the 1990s and a different version with no YPVS power