Harley-Davidson “JD” Twin

1927


  • Targeted police and riders who wanted the ultimate in acceleration, speed, and power
  • Three speed hand shift gear box is driven by a foot-operated multiplate dry clutch
  • The “JD” uses a roller bearing rear hub to carry the extra weight of the single and double side cars available with this model
  • The 74 ci (1213cc) twin used a standard single camshaft layout with an upgraded single unit electrical system
  • Maximum riding comfort with an improved cushion seat, front fork springs, full balloon tires, and a low riding position
  • Later models (known as the “JDH”) used a two-cam setup with roller rocker arms