... system Compact in structure ModelS170F(E)S178F(E)S178FA(E)S186F(E)S186FA(E)S188FB(E)S178FS(E)S186FS(E)TypeSingle cylinder ... , vertical, 4-stroke, air cooledSingle cylinder, vertical, 4-stroke, air cooledSingle cylinder, vertical, 4-stroke, air cooledSingle ...