SIMSONS 51 1980 - 1988

　　The production of the S51 was started in 1980. The most noticeable changes were the use of a completely redesigned, compact engine with a wide range of technical innovations and great variability. With this state-of-the-art 3-horsepower engine with 3- or 4-speed gearbox, A 10% reduction in fuel consumption is achieved, and the noise and exhaust emission limit values

　　according to ECE are still undercut. Further essential details were a plate spring clutch as well as a completely new kickstarter device.