1928 – on the Harley-davidson JD series motorcycles first installed a twin-cylinder engine, whereby the maximum speed reached 150 km/h. in the same year, Harley-Davidson begins to equip the motorcycles front brakes
Harley-Davidson JD. For the rare models of Harley-Davidson 20-ies of the last century, today’s collectors are willing to pay tens of thousands of dollars.
The first 1200 cc two-cylinder V-engine Harley was released in 1922 and was placed on a motorcycle without any changes until 1928. Some of the few changes have occurred on the model Harley-Davidson JD: alloy based on iron pistons have been installed and improved engine lubrication system and transmission.
In 1928, the audience first saw the engine with two camshafts on motorcycles JD series. Their maximum speed is varied from 128 to 160 km / h. Motorcycles manned the front brakes.