In 1960, H-D bought a small Italian company called Aeronuatica Macchi, or Aermacchi, and some glorious lightweights rolled out of this partnership. Aermacchi had impressive horizontal cylinder 250 and later 350 with a solid roadracing pedigree.
For America off-road versions of the Aermacchi 250 did quite well even with odd weight balance and poor ground clearance. Most Harley fans ignore the AMF days, but some serious fun and roadracing successes came along with AMF. By 1977, H-D had nine different lightweight models.