The first Harley-Davidson two cam engine is made available to the public on the JD series motorcycles. The bike is capable of top speeds between 85 - 100 mph.

• 哈雷戴维森将第一款双凸轮发动机配置在JD系列摩托车上。这款摩托车的最高速度可达85-100英里/小时。