motorbikes By RIL0004 Jan 1, 1966 helmets law trying to be placed Jan 1, 1969 helemt laws in place May 14, 1975 all but three states have law of helemets May 17, 1978 ktm 250 dirtbike made May 17, 1982 ktm 495 dirtbike made May 17, 1990 ktm 250 2 stroke made May 17, 1995 ktm 250 race bike made May 17, 1999 ktm300 exc made May 17, 2008 ktm 450sxf made May 17, 2015 ktm 350exc six day enduro made